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
GUID
(UUID V4):
(UUID V4):
7ad11d0b-a471-4406-a640-c3600164e3f9
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 |
---|---|---|
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 = 0.004
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v
Chemistry of Kilchoanite
Mindat Formula:
Ca6(SiO4)(Si3O10)
Originally assumed to be Ca3Si2O7.
Originally assumed to be Ca3Si2O7.
Elements listed:
Common Impurities:
Fe,Al
Crystallography of Kilchoanite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/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-𝑇 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:
Reference:
Agrell, S.O., Gay, P. (1961) Kilchoanite, a polymorph of rankinite. Nature: 189: 743-743.
Other Language Names for Kilchoanite
Common Associates
Associated Minerals 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 | Ruizite | Ca2Mn3+2[Si4O11(OH)2](OH)2 · 2H2O |
9.BJ.35 | Taniajacoite | SrCaMn3+2Si4O11(OH)4 · 2H2O |
9.BJ.35 | Strontioruizite | Sr2Mn3+2Si4O11(OH)4 · 2H2O |
9.BJ.40 | Ardennite-(As) | Mn2+4Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6 |
9.BJ.40 | Ardennite-(V) | Mn2+4Al4(AlMg)(VO4)(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.50 | Kornerupine | Mg3Al6(Si,Al,B)5O21(OH) |
9.BJ.50 | Prismatine | (◻,Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22 |
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
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
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
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 | |
| Rocks & Minerals (1991) |
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Birkhin gabbro massif, Narin-Kunta, Irkutsk Oblast, Russia