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Puech de Vermus, Espalion, Aveyron, Midi-Pyrénées, France
© Elmar Lackner
|Name:||From Gaelic "tacharan", a changeling, because the mineral breaks down into other compounds if left standing in air.|
May appear visually similar to tobermorite.
Classification of Tacharanite
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||8/F.21-40|
|Nickel-Strunz 10th (pending) edition ID:||9.HA.75|
9 : SILICATES (Germanates)
H : Unclassified silicates
A : With Alkali and Alkali-earth Elements
|Dana 8th edition ID:||22.214.171.124|
72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
3 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 3-, 4-, or 5-membered rings and 8-membered rings
|Hey's CIM Ref.:||16.11.8|
16 : Silicates Containing Aluminum and other Metals
11 : Aluminosilicates of Ca and Mg with or without alkalis
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Type Occurrence of Tacharanite
|Type Locality:||Portree, Trotternish, Isle of Skye, North West Highlands (Inverness-shire), Scotland, UK|
|Year of Discovery:||1961|
Physical Properties of Tacharanite
Crystallography of Tacharanite
|Cell Parameters:||a = 17.07Å, b = 3.65Å, c = 27.9Å|
β = 114.1°
|Ratio:||a:b:c = 4.677 : 1 : 7.644|
|Unit Cell Volume:||V 1,586.80 Å³ (Calculated from Unit Cell)|
Optical Data of Tacharanite
|RI values:||nα = 1.518 - 1.525 nγ = 1.530 - 1.537|
|Maximum Birefringence:||δ = 0.012|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Chemical Properties of Tacharanite
|Essential elements:||Al, Ca, H, O, Si|
|All elements listed in formula:||Al, Ca, H, O, Si|
Relationship of Tacharanite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Tacharanite
|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 Tacharanite
Sweet, J. M. (1961): Tacharanite and other hydrated calcium silicates from Portree, Isle of Skye. Mineral. Mag. 32, 745-753.
American Mineralogist (1962): 47: 173.
Cliff, G., Gard, J. A., Lorimer, G. W. & Taylor, H. F. W. (1975): Tacharanite. - Mineralogical Magazine: 40: 113-126.
American Mineralogist (1976): 61: 1055.
Mineralogical Magazine (1978): 42: 383.
Internet Links for Tacharanite
Localities for Tacharanite
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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