Tacharanite (original) (raw)

A valid IMA mineral species - grandfathered

About TacharaniteHide

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Formula:

Ca12Al2Si18O33 (OH)36

Specific Gravity:

2.33 - 2.36

Crystal System:

Monoclinic

Name:

From Gaelic "tacharan", a changeling, because the mineral breaks down into other compounds if left standing in air. (Note, however, that some specimens stored in collections for years showed no indication of any alteration when checked by powder X-ray diffraction.) Pronounced TĂ·KHERENAIT.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:3864:1

95f526db-f56a-46c6-acd8-6372d8e5aec0

IMA Classification of TacharaniteHide

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Approved, 'Grandfathered' (first described prior to 1959)

IMA Formula:

Ca12Al2Si18O33(OH)36

Type description reference:

Classification of TacharaniteHide

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9.HA.75

9 : SILICATES (Germanates)
H : Unclassified silicates
A : With Alkali and Alkali-earth Elements

72.3.2.6

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

16.11.8

16 : Silicates Containing Aluminum and other Metals
11 : Aluminosilicates of Ca and Mg with or without alkalis

Mineral SymbolsHide

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

Physical Properties of TacharaniteHide

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Density:

2.33 - 2.36 g/cm3 (Measured) 2.28 g/cm3 (Calculated)

Optical Data of TacharaniteHide

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RI values:

_n_α = 1.518 - 1.525 _n_γ = 1.530 - 1.537

δ = 0.012

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Dispersion:

relatively strong

Chemistry of TacharaniteHide

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Mindat Formula:

Ca12Al2Si18O33 (OH)36

Common Impurities:

Fe,Mg,Na,K

Crystallography of TacharaniteHide

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Crystal System:

Monoclinic

Cell Parameters:

a = 17.07 Å, b = 3.65 Å, c = 27.9 Å
β = 114.1°

Ratio:

a:b:c = 4.677 : 1 : 7.644

Unit Cell V:

1,586.80 ų (Calculated from Unit Cell)

Comment:

Point Group: n.d.; Space Group: A-centered monoclinic pseudocell.

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of TacharaniteHide

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General Appearance of Type Material:

Dense, white cryptocrystalline

Place of Conservation of Type Material:

Natural History Museum, London, England, 1961,163.
National School of Mines, Paris, France.

Associated Minerals at Type Locality:

Reference:

Sweet, J.M., Bothwell, D.I., Williams, D.L. (1961) Tacharanite and other hydrated calcium silicates from Portree, Isle of Skye. Mineralogical Magazine: 32: 745-753.

Other Language Names for TacharaniteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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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 TacharaniteHide

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References for TacharaniteHide

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Reference List:

Kato, A., Matsubara, S., Sakurai, K., Sakata, Y., Tiba, T. (1983) Tacharanite from Noaki, Yaizu City, Shizuoka Prefecture, Japan. Bulletin of the National Science Museum. Series C. (Kokuritsu kagaku hakubutsukan kenkyū hōkoku. C-rui: Jishitsugaku, koseibutsugaku): 9(3): 85-90.

Organova, N.I., Zadov, A.E., Chukanov, N.V., Dubinchuk, V.T., Kuznetsova, O.Yu., Trubkin, N.V., Levitskaya, L.A., Marsii, I.M. (2007) Structural model of the rare mineral tacharanite and a possible process of its formation. Bulletin of the Russian Academy of Sciences: Physics: 71: 635–637.

Localities for TacharaniteHide

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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

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- 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.