Gilmarite
A valid IMA mineral species
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About Gilmarite
Formula:
Cu3(AsO4)(OH)3
Colour:
Greenish blue
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
4.2
Crystal System:
Triclinic
Name:
Named for Gilbert Mari (1944-), mineralogist at the University of Nice-Sophia Antipolis, France.
Type Locality:
Dimorph of:
This page provides mineralogical data about Gilmarite.
Unique Identifiers
Mindat ID:
6970
Long-form identifier:
mindat:1:1:6970:6
Similar Names
| Hjalmarite | A valid IMA mineral species | Na(NaMn)Mg5(Si8O22)(OH)2 |
IMA Classification of Gilmarite
Approved
IMA Formula:
Cu2+3(As5+O4)(OH)3
Approval year:
1996
First published:
1999
Classification of Gilmarite
8.BE.25
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
E : With only medium-sized cations, (OH, etc.):RO4 > 2:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
E : With only medium-sized cations, (OH, etc.):RO4 > 2:1
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Gmr | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Gilmarite
Vitreous
Transparency:
Transparent
Colour:
Greenish blue
Streak:
Greenish blue
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
Good on {010}.
Good on {010}.
Fracture:
Irregular/Uneven
Density:
4.2(1) g/cm3 (Measured) 4.21 g/cm3 (Calculated)
Optical Data of Gilmarite
Type:
Biaxial (-)
RI values:
nα = 1.760(5) nβ = 1.80(1) nγ = 1.83(1)
2V:
Measured: 77° (4), Calculated: 80°
Max. Birefringence:
δ = 0.070
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:
Moderate
Dispersion:
r > v
Optical Extinction:
On {010}, X ∧ c = 33° and Y ∧ a = 37.1°; on {001}, Y ∧ a = 34.3° and Z ∧ b = 30.1°; on {101}, Z ∧ b = 44◦ and Y′ ∧ [101] = 36.5°.
Pleochroism:
Weak
Comments:
X = Y = light green; Z = green
Chemistry of Gilmarite
Mindat Formula:
Cu3(AsO4)(OH)3
Element Weights:
Elements listed:
Crystallography of Gilmarite
Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Cell Parameters:
a = 5.445(4) Å, b = 5.873(3) Å, c = 5.104(3) Å
α = 114.95(3)°, β = 93.05(5)°, γ = 91.92(4)°
α = 114.95(3)°, β = 93.05(5)°, γ = 91.92(4)°
Ratio:
a:b:c = 0.927 : 1 : 0.869
Unit Cell V:
147.49 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Lozenge-shaped crystals, typically in rosettes.
Type material crystals are elongated along [101] or [100] and flattened on {010}. The most developed forms are {100}, {010}, {001} and {101}.
Type material crystals are elongated along [101] or [100] and flattened on {010}. The most developed forms are {100}, {010}, {001} and {101}.
Twinning:
Not twinned.
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) |
|---|---|---|---|---|---|---|---|
| 0006791 | Gilmarite | Sarp H, Cerny R (1999) Gilmarite, Cu3(AsO4)(OH)3, a new mineral: its description and crystal structure European Journal of Mineralogy 11 549-555 | 1999 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.613 Å | (100) |
| 3.390 Å | (60) |
| 4.580 Å | (50) |
| 2.713 Å | (40) |
| 2.543 Å | (40) |
| 2.445 Å | (30) |
| 3.654 Å | (20) |
Comments:
Roua Mines, France. Data from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Gilmarite
General Appearance of Type Material:
Rosettes (0.3 mm diameter) and isolated crystals (0.1 × 0.04 × 0.02 mm maximum dimension).
Place of Conservation of Type Material:
Natural History Musem, Geneva, Switzerland, 477.006.
Associated Minerals at Type Locality:
Synonyms of Gilmarite
Other Language Names for Gilmarite
Common Associates
Associations Based on Photo Data:
| 24 photos of Gilmarite associated with Conichalcite | CaCu(AsO4)(OH) |
| 18 photos of Gilmarite associated with Malachite | Cu2(CO3)(OH)2 |
| 14 photos of Gilmarite associated with Arhbarite | Cu2Mg(AsO4)(OH)3 |
| 10 photos of Gilmarite associated with Cornwallite | Cu5(AsO4)2(OH)4 |
| 10 photos of Gilmarite associated with Cuprite | Cu2O |
| 2 photos of Gilmarite associated with Connellite | Cu19(SO4)(OH)32Cl4 · 3H2O |
| 2 photos of Gilmarite associated with Cornubite | Cu5(AsO4)2(OH)4 |
| 2 photos of Gilmarite associated with Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| 2 photos of Gilmarite associated with Bayldonite | PbCu3(AsO4)2(OH)2 |
| 1 photo of Gilmarite associated with Gypsum | CaSO4 · 2H2O |
Related Minerals - Strunz-mindat Grouping
| 8.BE.05 | Augelite | Al2(PO4)(OH)3 |
| 8.BE.10 | Grattarolaite | Fe3+3(PO4)O3 |
| 8.BE.15 | Cornetite | Cu3(PO4)(OH)3 |
| 8.BE.20 | Clinoclase | Cu3(AsO4)(OH)3 |
| 8.BE.25 | Arhbarite | Cu2Mg(AsO4)(OH)3 |
| 8.BE.30 | Flinkite | Mn2+2Mn3+(AsO4)(OH)4 |
| 8.BE.30 | Argandite | Mn7(VO4)2(OH)8 |
| 8.BE.30 | Raadeite | Mg7(PO4)2(OH)8 |
| 8.BE.30 | Allactite | Mn2+7(AsO4)2(OH)8 |
| 8.BE.35 | 'Mineral E (of Dunn, et. al., 1982)' | |
| 8.BE.35 | Chlorophoenicite | (Mn,Mg)3Zn2(AsO4)(OH,O)6 |
| 8.BE.35 | Magnesiochlorophoenicite | (Mg,Mn)3Zn2(AsO4)(OH,O)6 |
| 8.BE.40 | Gerdtremmelite | (Zn,Fe)(Al,Fe)2(AsO4)(OH)5 |
| 8.BE.45 | Dixenite | CuMn2+14Fe2+(SiO4)2(As5+O4)(As3+O3)5(OH)6 |
| 8.BE.45 | Mcgovernite | Mn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21 |
| 8.BE.45 | Hematolite | (Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23 |
| 8.BE.45 | Turtmannite | (Mn,Mg)22.5Mg3-3x((V5+,As5+)O4)3(As3+O3)x(SiO4)3O5-5x(OH)20+x |
| 8.BE.45 | Carlfrancisite | Mn2+3(Mn2+,Mg,Fe3+,Al)42[As3+O3]2(As5+O4)4[(Si,As5+)O4]6[(As5+,Si)O4]2(OH)42 |
| 8.BE.45 | Arakiite | (Zn,Mn2+)(Mn2+,Mg)12(Fe3+,Al)2(As5+O4)2(As3+O3)(OH)23 |
| 8.BE.45 | Kraisslite | Zn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2[(Si,As5+)O4]10(OH)16 |
| 8.BE.50 | Synadelphite | Mn2+9(As5+O4)2(As3+O3)(OH)9 · 2H2O |
| 8.BE.55 | Holdenite | (Mn2+,Mg)6Zn3(AsO4)2(SiO4)(OH)8 |
| 8.BE.60 | Kolicite | Mn2+7Zn4(AsO4)2(SiO4)2(OH)8 |
| 8.BE.65 | Sabelliite | (Cu,Zn)2Zn(AsO4,SbO4)(OH)3 |
| 8.BE.70 | Jarosewichite | Mn2+3Mn3+(AsO4)(OH)6 |
| 8.BE.75 | Theisite | Cu5Zn5(AsO4,SbO4)2(OH)14 |
| 8.BE.80 | Coparsite | Cu4(AsO4,VO4)O2Cl |
| 8.BE.85 | Waterhouseite | Mn2+7(PO4)2(OH)8 |
| 8.BE.90 | Vasilseverginite | Cu9O4(AsO4)2(SO4)2 |
Fluorescence of Gilmarite
Not fluorescent.
Other Information
Notes:
Soluble in HCl.
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 Gilmarite
mindat.org URL:
https://www.mindat.org/min-6970.html
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Please feel free to link to this page.
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References for Gilmarite
Localities for Gilmarite
Showing 11 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.
Chile | |
| Chemical analysis by Dr. Jochen Schluter (Curator of Hamburg Mineral Museum) +2 other references |
Czech Republic | |
| www.researchgate.net (n.d.) +1 other reference |
France | |
| Hohl (1994) |
| European Journal of Mineralogy (1999) +1 other reference |
Germany | |
| 70. +1 other reference |
Hungary | |
| HOM Collection 2008 |
Italy | |
| Fernando Caboni et al. (2024) |
| Fernando Caboni et al. (2024) | |
USA | |
| ex- John EBNER collection |
| Eckhard D. Stuart - collection +2 other references |
| Favreau (n.d.) |
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Guanaco Mine, Taltal, Antofagasta Province, Antofagasta, Chile