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Kilchoanite

A valid IMA mineral species - grandfathered
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About KilchoaniteHide

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 IdentifiersHide

Mindat ID:
2205
Long-form identifier:
mindat:1:1:2205:3
GUID
(UUID V4):
7ad11d0b-a471-4406-a640-c3600164e3f9

IMA Classification of KilchoaniteHide

Approved, 'Grandfathered' (first described prior to 1959)
First published:
1961

Classification of KilchoaniteHide

9.BJ.45

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)
14.5.5

14 : Silicates not Containing Aluminum
5 : Silicates of Ca

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
KiIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of KilchoaniteHide

Transparency:
Transparent, Translucent
Colour:
Colorless
Streak:
White
Cleavage:
None Observed
Density:
2.992 g/cm3 (Measured)    3.00 g/cm3 (Calculated)

Optical Data of KilchoaniteHide

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.
Surface Relief:
Moderate
Dispersion:
r > v

Chemistry of KilchoaniteHide

Mindat Formula:
Ca6(SiO4)(Si3O10)

Originally assumed to be Ca3Si2O7.
Common Impurities:
Fe,Al

Crystallography of KilchoaniteHide

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 StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0014452KilchoaniteTaylor H F W (1971) The crystal structure of kilchoanite, Ca6(SiO4)(Si3O10), with some comments on related phases Mineralogical Magazine 38 26-311971Kilchoan, Ardnamurchan, Scotland0293
0014491KilchoaniteKimata M (1989) The crystal structure of manganoan kilchoanite, Ca2.33Mn0.67Si2O7: a site preference rule for the substitution of Mn for Ca Mineralogical Magazine 53 625-63119890293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest 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 KilchoaniteHide

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 KilchoaniteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
5 photos of Kilchoanite associated with VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9
2 photos of Kilchoanite associated with RankiniteCa3Si2O7
1 photo of Kilchoanite associated with WollastoniteCa3(Si3O9)
1 photo of Kilchoanite associated with Clinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
1 photo of Kilchoanite associated with HillebranditeCa2(SiO3)(OH)2
1 photo of Kilchoanite associated with SpurriteCa5(SiO4)2(CO3)

Related Minerals - Strunz-mindat GroupingHide

9.BJ.ArsenmedaiteMn2+6 As5+Si5O18(OH)Mon. 2/m
9.BJ.05OrientiteCa8Mn3+10(SiO4)3(Si3O10)3(OH)10 · 4H2O Orth. mmm (2/m 2/m 2/m)
9.BJ.10RosenhahniteHCa3[Si3O9(OH)]Tric. 1 : P1
9.BJ.15TrabzoniteCa4(Si3O9)(OH)2Orth. mm2 : Ama2
9.BJ.20Thalénite-(Y)Y3Si3O10FMon.
9.BJ.25TiragalloiteMn2+4As5+Si3O12(OH)Mon. 2/m
9.BJ.30MedaiteMn2+6V5+Si5O18(OH)Mon. 2/m
9.BJ.35RuiziteCa2Mn3+2[Si4O11(OH)2](OH)2 · 2H2OMon. 2
9.BJ.35Taniajacoite SrCaMn3+2Si4O11(OH)4 · 2H2OTric. 1
9.BJ.35StrontioruiziteSr2Mn3+2Si4O11(OH)4 · 2H2OMon. 2 : B2
9.BJ.40Ardennite-(As)Mn2+4Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6Orth. mmm (2/m 2/m 2/m)
9.BJ.40Ardennite-(V)Mn2+4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6Orth. mmm (2/m 2/m 2/m) : Pmmn
9.BJ.40KannaniteCa4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6Orth. mmm (2/m 2/m 2/m) : Pmmn
9.BJ.40AlpeiteCa4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6Orth. mmm (2/m 2/m 2/m) : Pmmn
9.BJ.50KornerupineMg3Al6(Si,Al,B)5O21(OH)Orth. mmm (2/m 2/m 2/m) : Cmcm
9.BJ.50Prismatine(◻,Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22Orth. mmm (2/m 2/m 2/m) : Cmcm
9.BJ.55ZunyiteAl13Si5O20(OH,F)18ClIso. 4 3m : F4 3m
9.BJ.60HubeiteCa2Mn2+Fe3+Si4O12(OH) · 2H2OTric. 1 : P1
9.BJ.65Cassagnaite(Ca,Mn2+)4(Fe3+,Mn3+,Al)4(V3+,Mg,Al)2(Si3O10)(SiO4)2(OH,O)8Orth. mmm (2/m 2/m 2/m) : Cmcm
9.BJ.70PavlovskyiteCa8(SiO4)2(Si3O10)Orth. mmm (2/m 2/m 2/m) : Pbcn

Other InformationHide

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 KilchoaniteHide

References for KilchoaniteHide

Reference List:

Localities for KilchoaniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- 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.
Italy
 
  • Veneto
    • Padova Province
      • Galzignano Terme
Cámara et al. (2012) +1 other reference
Japan
 
  • Okayama Prefecture
    • Takahashi City
      • Bitchū
        • Fuka
Henmi et al (1975)
Middle East
 
Gross (1977)
New Zealand
 
  • Northland Region
    • Kaipara District
Black (1969)
Baker et al. (1980)
Poland
 
  • Lower Silesian Voivodeship
    • Kłodzko County
      • Gmina Nowa Ruda
        • Przygórze
          • Bolesław Mine
Łukasz Kruszewski PXRD data
Romania
 
  • Brașov County
Szakáll
Szakáll et al. (2010)
  • Caraş-Severin County
    • Prigor
Marincea et al. (2015)
Russia
 
  • Irkutsk Oblast
    • Narin-Kunta
Savel'eva V.B. et al. (1992) +1 other reference
UK (TL)
 
  • Scotland
    • Highland
      • Fort William and Ardnamurchan
        • Ardnamurchan
Agrell et al. (1961) +3 other references
USA
 
  • Texas
    • Brewster County
      • Christmas Mountains
Rocks & Minerals (1991)
 
Mineral and/or Locality  
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