Foitite
A valid IMA mineral species
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About Foitite
Dr. Franklin F. Foit, Jr.
Formula:
◻(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
Colour:
Dark indigo with purple tints to bluish-black
Lustre:
Vitreous, Sub-Vitreous
Hardness:
7
Specific Gravity:
3.17
Crystal System:
Trigonal
Member of:
Name:
Named in 1993 by D. J. MacDonald, Frank C. Hawthorne, and Joel D. Grice in honor of Franklin F. Foit, Jr. (b. 1942), mineralogist and specialist in the tourmaline group, at Washington State University in Pullman, Washington, USA.
Type Locality:
A vacancy-dominant member of the Tourmaline Group. The Fe2Al-OH-analogue of oxy-foitite.
Correct identification is only possible by suitable analytical methods.
Relatively common among low-temperature (authigenic) tourmalines (Henry & Dutrow, 2012).
Visit gemdat.org for gemological information about Foitite.
Correct identification is only possible by suitable analytical methods.
Relatively common among low-temperature (authigenic) tourmalines (Henry & Dutrow, 2012).
Visit gemdat.org for gemological information about Foitite.Unique Identifiers
Mindat ID:
1579
Long-form identifier:
mindat:1:1:1579:6
Similar Names
| Foidite | A rock classification type | |
| Footeite | A synonym of Connellite | |
| Viteite | A valid IMA mineral species | Pd5InAs |
IMA Classification of Foitite
Approved
IMA Formula:
◻(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OH
Approval year:
1992
First published:
1993
Classification of Foitite
9.CK.05
9 : SILICATES (Germanates)
C : Cyclosilicates
K : [Si6O18]12- 6-membered single rings, with insular complex anions
9 : SILICATES (Germanates)
C : Cyclosilicates
K : [Si6O18]12- 6-membered single rings, with insular complex anions
Dana 7th ed.:
61.3.1.1
61.3.1.1
61 : CYCLOSILICATES Six-Membered Rings
3 : Six-Membered Rings with borate groups
61 : CYCLOSILICATES Six-Membered Rings
3 : Six-Membered Rings with borate groups
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Foi | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Foi | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Foitite
Vitreous, Sub-Vitreous
Transparency:
Transparent, Translucent
Colour:
Dark indigo with purple tints to bluish-black
Streak:
Greyish-white
Hardness:
7 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
None.
None.
Fracture:
Conchoidal, Sub-Conchoidal
Density:
3.17 g/cm3 (Measured) 3.14 g/cm3 (Calculated)
Optical Data of Foitite
Type:
Uniaxial (-)
RI values:
nω = 1.664 nε = 1.642
Birefringence:
0.022
Max. Birefringence:
δ = 0.022
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Optical Extinction:
Parallel
Pleochroism:
Strong
Comments:
O < E; O = pale lavender, E = dark blue
Chemistry of Foitite
Mindat Formula:
◻(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
Element Weights:
Common Impurities:
Mn,Mg,Ca,Na,Li,B,H2O
Crystallography of Foitite
Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Setting:
R3m
Cell Parameters:
a = 15.967 Å, c = 7.126 Å
Ratio:
a:c = 1 : 0.446
Unit Cell V:
1,573.34 ų (Calculated from Unit Cell)
Z:
3
Morphology:
Rod-like crystals with the common prisms and pyramids of the tourmaline group.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005633 | Foitite | Francis C A, Dyar M D, Williams M L, Hughes J M (1999) The occurrence and crystal structure of foitite from a tungsten-bearing vein at Copper Mountain, Taos County, New Mexico The Canadian Mineralogist 37 1431-1438 |  | 1999 | Copper Mountain, Taos County, New Mexico | 0 | 293 |
| 0001622 | Foitite | MacDonald D J, Hawthorne F C, Grice J D (1993) Foitite, _[Fe2(Al,Fe)]Al6Si6O18(BO3)3(OH)4, a new alkali-deficient tourmaline: Description and crystal structure American Mineralogist 78 1299-1303 | | 1993 | likely White Queen mine, San Diego County, California, USA | 0 | 293 |
| 0006843 | Foitite | Kahlenberg V, Velickov B (2000) Structural investigations on a synthetic alkali-free hydrogen-deficient Fe-tourmaline (foitite) Locvality: synthetic European Journal of Mineralogy 12 947-953 | 2000 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Loading XRD data...
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.337 Å | (84) |
| 4.962 Å | (21) |
| 4.606 Å | (6) |
| 4.214 Å | (48) |
| 3.989 Å | (38) |
| 3.453 Å | (91) |
| 3.376 Å | (6) |
| 3.168 Å | (4) |
| 3.015 Å | (7) |
| 2.945 Å | (71) |
| 2.897 Å | (5) |
| 2.576 Å | (100) |
| 2.344 Å | (8) |
| 2.184 Å | (11) |
| 2.165 Å | (6) |
| 2.112 Å | (17) |
| 2.037 Å | (29) |
| 1.916 Å | (15) |
| 1.867 Å | (8) |
| 1.851 Å | (7) |
| 1.654 Å | (15) |
| 1.584 Å | (11) |
| 1.528 Å | (5) |
| 1.498 Å | (11) |
| 1.449 Å | (18) |
| 1.311 Å | (5) |
| 1.267 Å | (25) |
Comments:
MacDonald, D.J., Hawthorne, F.C., and Grice, J.D. (1993) Foitite Fe2 2+(Al,Fe 3+)]Al6Si6O18(BO3)3(OH)4, a new alkali-deficient tourmaline: Description and crystal structure. American Mineralogist: 78: 1299-1303.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
| 26 : Hadean detrital minerals | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites | |
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 40 : Regional metamorphism (greenschist, amphibolite, granulite facies) |
Geological Setting:
Granite pegmatites, altered tuffs, hydrothernal veins.
Type Occurrence of Foitite
General Appearance of Type Material:
Bluish black prisms of triangular cross section, elongated along c with striations parallel to c on the convex prism face.
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, Canada, 81512.
Geological Setting of Type Material:
Granite pegmatite gem pockets.
Synonyms of Foitite
Other Language Names for Foitite
Relationship of Foitite to other Species
Member of:
Other Members of Tourmaline:
| Adachiite | CaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Alumino-oxy-rossmanite | ◻Al3Al6(Si5AlO18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Bosiite | NaFe3+3(Al4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Celleriite | ◻(Mn2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Chromium-dravite | NaMg3Cr3+6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Chromo-alumino-povondraite | NaCr3(Al4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Darrellhenryite | Na(Al2Li)Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Dutrowite | Na(Fe2+2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Ertlite | NaAl3Al6(Si4B2O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Ferro-bosiite | NaFe3+3(Al4Fe2+2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Feruvite | CaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Fluor-buergerite | NaFe3+3Al6(Si6O18)(BO3)3O3F | Trig. 3m : R3m |
| Fluor-dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
| Fluor-elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
| Fluor-liddicoatite | Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
| Fluor-rossmanite | ◻(Al2Li)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m(32/m) : R3m |
| Fluor-schorl | NaFe2+3Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
| Fluor-tsilaisite | NaMn2+3Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
| Fluor-uvite | CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
| Liddicoatite | Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Lucchesiite | CaFe2+3 Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Magnesio-dutrowite | Na(Mg2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Magnesio-foitite | ◻(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Magnesio-lucchesiite | CaMg3Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Maruyamaite | K(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Olenite | NaAl3Al6(Si6O18)(BO3)3O3(OH) | Trig. 3m : R3m |
| Oxy-chromium-dravite | NaCr3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Oxy-dravite | Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Oxy-foitite | ◻(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m(32/m) : R3m |
| Oxy-schorl | Na(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Oxy-vanadium-dravite | NaV3(V4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Povondraite | NaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Princivalleite | Na(Mn2Al)Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Rossmanite | ◻(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Schorl | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Tsilaisite | NaMn2+3Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| 'UM2000-64-SiO:BFeHKMg' | (K,Na)Fe3+3(Mg2Fe3+4)Si6O18(BO3)3(OH)3O | |
| 'UM2008-52-SiO:AlBCaFFeHLiMgNa' | (Ca,Na,◻)(Al,Li,Fe,Mg)3Al6[Si6O18](BO3)3(OH,O)3(F,O) | |
| 'Unnamed (F analogue of feruvite)' | CaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3F | |
| 'Unnamed (Mn2+-F-analogue of foitite)' | ◻(Mn2+2Al)Al6(Si6O18)(BO3)3(OH)3F ? | |
| 'Unnamed (Pb-analogue of Fluor-liddicoatite)' | Pb(Li2Al)Al6(Si6O18)(BO3)3(OH)3F | |
| Uvite | CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Vanadio-oxy-chromium-dravite | NaV3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Vanadio-oxy-dravite | NaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Common Associates
Associations Based on Photo Data:
| 68 photos of Foitite associated with Schorl | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| 22 photos of Foitite associated with Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) |
| 19 photos of Foitite associated with Quartz | SiO2 |
| 19 photos of Foitite associated with Fluorite | CaF2 |
| 14 photos of Foitite associated with Microcline | K(AlSi3O8) |
| 13 photos of Foitite associated with Albite | Na(AlSi3O8) |
| 11 photos of Foitite associated with Muscovite | KAl2(AlSi3O10)(OH)2 |
| 10 photos of Foitite associated with 'Aquamarine' | |
| 9 photos of Foitite associated with 'Opal-AN' | SiO2 · nH2O |
| 8 photos of Foitite associated with Tourmaline | AD3G6(T6O18)(BO3)3X3Z |
Related Minerals - Strunz-mindat Grouping
| 9.CK. | Adachiite | CaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH) |
| 9.CK. | Magnesio-dutrowite | Na(Mg2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3O |
| 9.CK. | Darrellhenryite | Na(Al2Li)Al6(Si6O18)(BO3)3(OH)3O |
| 9.CK. | Fluor-schorl | NaFe2+3Al6(Si6O18)(BO3)3(OH)3F |
| 9.CK. | Princivalleite | Na(Mn2Al)Al6(Si6O18)(BO3)3(OH)3O |
| 9.CK. | Alumino-oxy-rossmanite | ◻Al3Al6(Si5AlO18)(BO3)3(OH)3O |
| 9.CK. | Dutrowite | Na(Fe2+2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3O |
| 9.CK. | Ferro-bosiite | NaFe3+3(Al4Fe2+2)(Si6O18)(BO3)3(OH)3O |
| 9.CK. | Bosiite | NaFe3+3(Al4Mg2)(Si6O18)(BO3)3(OH)3O |
| 9.CK. | Celleriite | ◻(Mn2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Feruvite | CaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Chromium-dravite | NaMg3Cr3+6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Fluor-rossmanite | ◻(Al2Li)Al6(Si6O18)(BO3)3(OH)3F |
| 9.CK.05 | Oxy-schorl | Na(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Fluor-elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3F |
| 9.CK.05 | Dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Fluor-uvite | CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3F |
| 9.CK.05 | Vanadio-oxy-dravite | NaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Fluor-buergerite | NaFe3+3Al6(Si6O18)(BO3)3O3F |
| 9.CK.05 | 'Unnamed (F analogue of feruvite)' | CaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3F |
| 9.CK.05 | Ertlite | NaAl3Al6(Si4B2O18)(BO3)3(OH)3O |
| 9.CK.05 | Tsilaisite | NaMn2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Fluor-liddicoatite | Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3F |
| 9.CK.05 | Uvite | CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Fluor-tsilaisite | NaMn2+3Al6(Si6O18)(BO3)3(OH)3F |
| 9.CK.05 | Oxy-foitite | ◻(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Liddicoatite | Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Vanadio-oxy-chromium-dravite | NaV3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Rossmanite | ◻(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Oxy-vanadium-dravite | NaV3(V4Mg2)(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Olenite | NaAl3Al6(Si6O18)(BO3)3O3(OH) |
| 9.CK.05 | 'UM2000-64-SiO:BFeHKMg' | (K,Na)Fe3+3(Mg2Fe3+4)Si6O18(BO3)3(OH)3O |
| 9.CK.05 | Magnesio-lucchesiite | CaMg3Al6(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Povondraite | NaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Lucchesiite | CaFe2+3 Al6(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Chromo-alumino-povondraite | NaCr3(Al4Mg2)(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Fluor-dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3F |
| 9.CK.05 | Oxy-dravite | Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Oxy-chromium-dravite | NaCr3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | 'Luinaite-(OH)' | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Schorl | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Magnesio-foitite | ◻(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Maruyamaite | K(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O |
| 9.CK.10 | Abenakiite-(Ce) | Na26Ce6(Si6O18)(PO4)6(CO3)6(SO2)O |
| 9.CK.15 | Scawtite | Ca7(Si3O9)2CO3 · 2H2O |
| 9.CK.20 | Thorosteenstrupine | (Ca,Th,Mn)3Si4O11F · 6H2O |
| 9.CK.20 | Steenstrupine-(Ce) | Na14Mn2+2Fe3+2Ce6Zr(Si6O18)2(PO4)6(PO3OH)(OH)2 · 2H2O |
Fluorescence of Foitite
Not fluorescent.
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Foitite
mindat.org URL:
https://www.mindat.org/min-1579.html
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References for Foitite
Reference List:
Rosenberg, Philip E., Foit, Franklin F. (1979) Synthesis and characterization of alkali-free tourmaline. American Mineralogist, 64 (1-2) 180-186
Macdonald, Daniel J., Hawthorne, Frank C., Grice, Joel D. (1993) Foitite, ◻Fe2+2(Al,Fe3+)]Al6Si6O18(BO3)3(OH)4 a new alkali-deficient tourmaline: Description and crystal structure. American Mineralogist, 78 (11-12) 1299-1303
Aurisicchio, Carlo, Ottolini, Luisa, Pezzotta, Federicο (1999) Electron- and ion-microprobe analyses, and genetic inferences of tourmalines of the foitite-schorl solid solution, Elba Island (Italy) European Journal of Mineralogy, 11 (2) 217-226 doi:10.1127/ejm/11/2/0217
Francis, C. A., Dyar, M. D., Williams, M. L., Hughes, J. M. (1999) The occurrence and crystal structure of foitite from a tungsten-bearing vein at Copper Mountain, Taos County, New Mexico. The Canadian Mineralogist, 37 (6) 1431-1438
Kahlenberg, Volker; Veličkov, Boza (2000) Structural investigations on a synthetic alkali-free hydrogen-deficient Fe-tourmaline (foitite). European Journal of Mineralogy, 12 (5). p.947-953. doi:10.1127/0935-1221/2000/0012-0947
Novák, M.; Taylor, M. C. (2000) Foitite: formation during late stages of evolution of complex granitic pegmatites at Dobrá Voda, Czech Republic, and Pala, California, U.S.A. The Canadian Mineralogist, 38 (6). p.1399-1408. doi:10.2113/gscanmin.38.6.1399
Medaris, L. G., Fournelle, J. H., Henry, D. J. (2003) Tourmaline-bearing quartz veins in the Baraboo Quartzite, Wisconsin: occurrence and significance of foitite and "oxy-foitite". The Canadian Mineralogist, 41 (3) 749-758 doi:10.2113/gscanmin.41.3.749
Pieczka, A., Buniak, A., Majka, J., Harryson H, . (2011) Si-deficient foitite with [4]Al and [4]B from the ‘Ługi-1’ borehole, southwestern Poland. Journal of GEOsciences, 56 (4) 389-398
Henry, D. J., Dutrow, B. L. (2012) Tourmaline at diagenetic to low-grade metamorphic conditions: Its petrologic applicability. Lithos, 154. 16-32 doi:10.1016/j.lithos.2012.08.013
Bačík, Peter; Ertl, Andreas; Števko, Martin; Giester, Gerald; Sečkár, Peter (2015) Acicular zoned tourmaline (magnesio-foitite to foitite) from a quartz vein near Tisovec, Slovakia: the relationship between crystal chemistry and acicular habit. The Canadian Mineralogist, 53 (2). p.221-234. doi:10.3749/canmin.1400085
Localities for Foitite
Showing 133 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Afghanistan | |
| Lavinsky (n.d.) +1 other reference |
Antarctica | |
| Wadoski et al. (2011) |
Argentina | |
| Rocks & Min. (2007) |
| Colombo et al. (2011) |
| Mercado et al. (2025) |
Australia | |
| Victoria Museum Specimen |
| Bottrill (2020) |
| Bottrill +1 other reference |
Austria | |
| Ertl et al. (2012) |
Bolivia | |
| Lorin Fassbender et al. (2024) |
Brazil | |
| Sergio Varvello photo |
| Novák et al. (2000) +1 other reference |
Bulgaria | |
| Novák (2011) |
| Vasil Arnaudov et al. (2003) |
Canada | |
| Dixon (2014, October) |
| Can Min.38:877-891 +2 other references |
| Cerny et al. 2012 +1 other reference |
| Geological Association of Canada (2014) |
| Tindle et al. (2002) +1 other reference |
| Tindle et al. (2005) |
| Avalon Advanced Materials Inc. | |
China | |
| Guo et al. (2023) |
| Su et al. (2026) | |
| Liu et al. (2026) |
| Qin et al. (2023) |
| Xuemin et al. (2026) | |
| Zhu +2 other references |
| Feng et al. (2019) |
| Yao et al. (2024) | |
| Zhang AC et al. (2004) |
| Chen et al. (2025) |
Czech Republic | |
| Gadas et al. (2011) |
| Vácha et al. (2025) |
| Historic mineral collection National ... +1 other reference |
| Scarlett Urbanová (2021) |
| Houzar S.: Minerální asociace ... |
| Staněk (1997) |
| Novák et al. (2008) | |
| Novák et al. (1999) | |
| Novák +2 other references |
| P. Pauliš (2001) | |
| P. Pauliš (2001) | |
| Scarlett Urbanová (2021) |
Germany | |
| Witzke et al. (2008) |
| Lefebvre et al. (2017) |
| Färber (n.d.) |
Hungary | |
| WDS: Béla Fehér |
India | |
| Dandekar et al. (2025) |
Ireland | |
| David Jordan |
Italy | |
| Diella et al. (2018) |
| Vignola et al. (2018) |
| Vignola et al. (2018) |
| Bosi et al. (2017) +1 other reference |
| Pezzotta et al. (1996) |
| Barsotti et al. (2006) | |
| Pezzotta et al. (1996) +2 other references | |
| Field Trip Excursion Programm IMA et al. (M.E. Ciriotti) |
| Pezzotta et al. (1998) | |
Japan | |
| Kato et al (1994) |
| Minakawa & Adachi (1995) |
| Minakawa & Adachi (1995) |
| Petrov (n.d.) |
Morocco | |
| Mahjoubi et al. (2016) |
| Giannoni et al. (2025) |
Myanmar | |
| various added photos |
Namibia | |
| von Bezing (2007) |
| Ferdinando Giovine collection (analysed by Prof. Al Falster) +2 other references | |
| Foitite has been identified by Prof. Al Falster (unpublished results) |
| Jahn (2010) |
Pakistan | |
| Journal of Himalayan Earth Sciences 43 (2010) |
| imported from Shigar District +1 other reference | |
Peru | |
| Harlaux et al. (2020) |
Poland | |
| Pieczka +3 other references |
| Długoszewska (2005) |
| Szełęg et al. (Karkonosze massif, Lower Silesia, Poland) |
| Maciąg (2018) |
| Pieczka et al. (2017) |
| Pieczka et al. (2017) | |
| Pieczka et al. (2018) +1 other reference |
Portugal | |
| Figueiras +5 other references | |
| Dias et al. (2009) |
Russia | |
| Scott (2012) |
| Plotinskaya et al. (2014) |
| Baksheev et al. (2025) |
| Baksheev et al. (2025) |
| Kuzhuget et al. (2015) |
| Kasatkin et al. (2024) |
Rwanda | |
| Acke et al. (2025) |
Slovakia | |
| Juraj ŽItňan (2011) |
| Ferenc Š. et al. (2014) |
| Bačík et al. (2015) |
| Pauliš et al. (2002) +1 other reference |
| Bačík et al. (2022) | |
| Bačík et al. (2018) |
| Bačík et al. (2018) |
| Koděra et al. (1986) |
Spain | |
| Alejandro Sánchez Jiménez |
| Sainz de Baranda Graf et al. (2026) |
| Tánago et al. (2012) |
Sweden | |
| |
| Selway et al. (2002) | |
Turkey | |
| Yavuz et al. (1999) +1 other reference |
UK | |
| Duchoslav et al. (2017) |
| Tindle (2008) |
USA (TL) | |
| Am.Min. (1993) |
| Caltech |
| Mauthner (2024) |
| Hapeman (2011) |
| Rocks & Minerals: May |
| Osborn +1 other reference | |
| Novák et al. (2000) +1 other reference | |
| David London et al. (2016) |
| Fred E. Davis Collection |
| Jarnot (2011) |
| Pedro-Pablo Gil-Crespo et al. (2012) +2 other references |
| King (2009) |
| King (2009) | |
| King (n.d.) |
| optically confirmed by A. Falster of ... +5 other references |
| King et al. (1994) +1 other reference |
| King et al. (6) | |
| King (n.d.) | |
| minerals.gps.caltech.edu (2005) +1 other reference |
| confirmed by Al Falster at MMM Lab. +1 other reference | |
| King (2000) +1 other reference |
| King (n.d.) |
| Francis et al. (1999) |
| Medaris et al. (2003) |
| Medaris et al. (2003) | |
| Medaris et al. (2003) +1 other reference |
Zambia | |
| ONDRUŠ P et al. (2002) |
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Rosina vein, San Piero in Campo, Campo nell'Elba, Livorno Province, Tuscany, Italy