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|Originally assumed to be Ca3Si2O7.|
This page provides mineralogical data about Kilchoanite.
Classification of Kilchoanite
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||8/C.03-20|
|Nickel-Strunz 10th (pending) edition ID:||9.BJ.45|
9 : SILICATES (Germanates)
B : Sorosilicates
J : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in octahedral  and greater coordination
|Dana 8th edition ID:||22.214.171.124|
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)
|Hey's CIM Ref.:||14.5.5|
14 : Silicates not Containing Aluminum
5 : Silicates of Ca
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Type Occurrence of Kilchoanite
|Type Locality:||Kilchoan, Ardnamurchan, North West Highlands (Argyllshire), Scotland, UK|
|Year of Discovery:||1961|
Crystallography of Kilchoanite
|Cell Parameters:||a = 11.42Å, b = 5.09Å, c = 21.95Å|
|Ratio:||a:b:c = 2.244 : 1 : 4.312|
|Unit Cell Volume:||V 1,275.91 Å³ (Calculated from Unit Cell)|
Optical Data of Kilchoanite
|RI values:||nα = 1.647 nβ = 1.649 nγ = 1.650|
|2V:||Measured: 60° , Calculated: 70°|
|Maximum Birefringence:||δ = 0.003|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||r > v|
Chemical Properties of Kilchoanite
Originally assumed to be Ca3Si2O7.
|Simplified for copy/paste:||Ca6(SiO4)(Si3O10)|
|Essential elements:||Ca, O, Si|
|All elements listed in formula:||Ca, O, Si|
Relationship of Kilchoanite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Kilchoanite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Kilchoanite
American Mineralogist (1961): 46: 1203.
Taylor, H. F. W. (1971): Crystal structure of kilchoanite, Ca6(SiO4)(Si3O10), with some comments on related phases. Mineralogical Magazine 38, 26-31.
Internet Links for Kilchoanite
Localities for Kilchoanite
The 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.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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Locality Updated: Trelissick Dyke, Feock, Wendron & Falmouth District, Cornwall, England, UKFrom Peter Haas, 2nd Sep 2014 16:55:59