Kilchoanite
A valid IMA mineral species - grandfathered
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About Kilchoanite
Formula:
Ca6(SiO4)(Si3O10)
Originally assumed to be Ca3Si2O7.
Colour:
Colorless
Specific Gravity:
2.992
Crystal System:
Orthorhombic
Name:
For the community of Kilchoan, Scotland, the type locality.
This page provides mineralogical data about Kilchoanite.
Unique Identifiers
Mindat ID:
2205
Long-form identifier:
mindat:1:1:2205:3
IMA Classification of Kilchoanite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1961
Type description reference:
Classification of Kilchoanite
9.BJ.45
9 : SILICATES (Germanates)
B : Sorosilicates
J : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in octahedral [6] and greater coordination
9 : SILICATES (Germanates)
B : Sorosilicates
J : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in octahedral [6] and greater coordination
58.3.2.1
58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
3 : Insular, Mixed, Single, and Larger Tetrahedral Groups with insular single and triple groups (n=1, 3)
58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
3 : Insular, Mixed, Single, and Larger Tetrahedral Groups with insular single and triple groups (n=1, 3)
14.5.5
14 : Silicates not Containing Aluminum
5 : Silicates of Ca
14 : Silicates not Containing Aluminum
5 : Silicates of Ca
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 |
|---|---|---|
| Ki | 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 Kilchoanite
Transparency:
Transparent, Translucent
Colour:
Colorless
Streak:
White
Cleavage:
None Observed
Density:
2.992 g/cm3 (Measured) 3.00 g/cm3 (Calculated)
Optical Data of Kilchoanite
Type:
Biaxial (-)
RI values:
nα = 1.646 - 1.647 nβ = 1.648 nγ = 1.650
2V:
Measured: 46° to 60°, Calculated: 70° to 70°
Max. Birefringence:
δ = 0.003 - 0.004
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
Chemistry of Kilchoanite
Mindat Formula:
Ca6(SiO4)(Si3O10)
Originally assumed to be Ca3Si2O7.
Originally assumed to be Ca3Si2O7.
Element Weights:
Elements listed:
Common Impurities:
Fe,Al
Crystallography of Kilchoanite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Cell Parameters:
a = 11.42(5) Å, b = 5.09(5) Å, c = 21.95(5) Å
Ratio:
a:b:c = 2.244 : 1 : 4.312
Unit Cell V:
1,275.91 ų (Calculated from Unit Cell)
Z:
8
Morphology:
massive, to 2 mm.
Comment:
Space Group: Imam or Ima2:
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) |
|---|---|---|---|---|---|---|---|
| 0014452 | Kilchoanite | Taylor H F W (1971) The crystal structure of kilchoanite, Ca6(SiO4)(Si3O10), with some comments on related phases Mineralogical Magazine 38 26-31 |  | 1971 | Kilchoan, Ardnamurchan, Scotland | 0 | 293 |
| 0014491 | Kilchoanite | Kimata M (1989) The crystal structure of manganoan kilchoanite, Ca2.33Mn0.67Si2O7: a site preference rule for the substitution of Mn for Ca Mineralogical Magazine 53 625-631 | | 1989 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.17 Å | (medium) |
| 2.89 Å | (strong) |
| 2.68 Å | (strong) |
| 3.07 Å | (strong) |
| 3.56 Å | (medium strong) |
| 2.36 Å | (medium strong) |
| 1.964 Å | (medium strong) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 31 : Thermally altered carbonate, phosphate, and iron formations | |
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 51 : Pyrometamorphic minerals (see also #54 and #56) | <0.36 |
Type Occurrence of Kilchoanite
General Appearance of Type Material:
coarse (1-2 mm) irregular interlocking crystals
Place of Conservation of Type Material:
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 119424, 119425.
Geological Setting of Type Material:
High temperature contact metamorphism in siliceous limestone.
Associated Minerals at Type Locality:
Other Language Names for Kilchoanite
Common Associates
Associations Based on Photo Data:
| 5 photos of Kilchoanite associated with Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| 2 photos of Kilchoanite associated with Rankinite | Ca3Si2O7 |
| 1 photo of Kilchoanite associated with Wollastonite | Ca3(Si3O9) |
| 1 photo of Kilchoanite associated with Clinozoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| 1 photo of Kilchoanite associated with Hillebrandite | Ca2(SiO3)(OH)2 |
| 1 photo of Kilchoanite associated with Spurrite | Ca5(SiO4)2(CO3) |
Related Minerals - Strunz-mindat Grouping
| 9.BJ. | Arsenmedaite | Mn2+6 As5+Si5O18(OH) |
| 9.BJ.05 | Orientite | Ca8Mn3+10(SiO4)3(Si3O10)3(OH)10 · 4H2O |
| 9.BJ.10 | Rosenhahnite | HCa3[Si3O9(OH)] |
| 9.BJ.15 | Trabzonite | Ca4(Si3O9)(OH)2 |
| 9.BJ.20 | Thalénite-(Y) | Y3Si3O10F |
| 9.BJ.25 | Tiragalloite | Mn2+4As5+Si3O12(OH) |
| 9.BJ.30 | Medaite | Mn2+6V5+Si5O18(OH) |
| 9.BJ.35 | Strontioruizite | Sr2Mn3+2Si4O11(OH)4 · 2H2O |
| 9.BJ.35 | Ruizite | Ca2Mn3+2[Si4O11(OH)2](OH)2 · 2H2O |
| 9.BJ.35 | Taniajacoite | SrCaMn3+2Si4O11(OH)4 · 2H2O |
| 9.BJ.40 | Ardennite-(As) | Mn2+4Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6 |
| 9.BJ.40 | Kannanite | Ca4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6 |
| 9.BJ.40 | Alpeite | Ca4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6 |
| 9.BJ.40 | Ardennite-(V) | Mn2+4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6 |
| 9.BJ.50 | Prismatine | (◻,Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22 |
| 9.BJ.50 | Kornerupine | Mg3Al6(Si,Al,B)5O21(OH) |
| 9.BJ.55 | Zunyite | Al13Si5O20(OH,F)18Cl |
| 9.BJ.60 | Hubeite | Ca2Mn2+Fe3+Si4O12(OH) · 2H2O |
| 9.BJ.65 | Cassagnaite | (Ca,Mn2+)4(Fe3+,Mn3+,Al)4(V3+,Mg,Al)2(Si3O10)(SiO4)2(OH,O)8 |
| 9.BJ.70 | Pavlovskyite | Ca8(SiO4)2(Si3O10) |
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 Kilchoanite
mindat.org URL:
https://www.mindat.org/min-2205.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Kilchoanite
Reference List:
Black, Philippa M. (1969) Rankinite and kilehoanite from Tokatoka, New Zealand. Mineralogical Magazine, 37 (288) 517-519 doi:10.1180/minmag.1969.037.288.13
Kimata, Mitsuyoshi (1989) The crystal structure of manganoan kilchoanite, Ca2.33Mn0.67Si2O7: a site-preference rule for the substitution of Mn for Ca. Mineralogical Magazine, 53 (373) 625-631 doi:10.1180/minmag.1989.053.373.13
Galuskin, E. V., Gfeller, F., Savelyeva, V. B., Armbruster, T., Lazic, B., Galuskina, I. O., Tobbens, D. M., Zadov, A. E., Dzierzanowski, P., Pertsev, N. N., Gazeev, V. M. (2012) Pavlovskyite Ca8(SiO4)2(Si3O10): A new mineral of altered silicate-carbonate xenoliths from the two Russian type localities, Birkhin massif, Baikal Lake area and Upper Chegem caldera, North Caucasus. American Mineralogist, 97 (4) 503-512 doi:10.2138/am.2012.3970
Localities for Kilchoanite
Showing 12 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.
Italy | |
| Cámara et al. (2012) +1 other reference |
Japan | |
| Henmi et al (1975) |
Middle East | |
| Gross (1977) | |
New Zealand | |
| Black (1969) |
| Baker et al. (1980) | |
Poland | |
| Łukasz Kruszewski PXRD data |
Romania | |
| Szakáll |
| Szakáll et al. (2010) | |
| Marincea et al. (2015) |
Russia | |
| Savel'eva V.B. et al. (1992) +1 other reference |
UK (TL) | |
| Agrell et al. (1961) +3 other references |
USA | |
| Smith (1991) |
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Birkhin gabbro massif, Narin-Kunta, Irkutsk Oblast, Russia