Charoite (original) (raw)

A valid IMA mineral species

About CharoiteHide

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Formula:

(K,Sr)15-16(Ca,Na)32[Si6O11(O,OH)6]2[Si12O18(O,OH)12]2[Si17O25(O,OH)18]2(OH,F)4 · ~3H2O

Colour:

Violet to deep lilac, whitish-grey to brown

Crystal System:

Monoclinic

Name:

For the type locality, near the Chara River, Russia.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:972:4

200389f3-2447-4082-b82e-0478b4179623

IMA Classification of CharoiteHide

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IMA Formula:

(K,Sr,Ba,Mn)15-16(Ca,Na)32[Si70(O,OH)180](OH,F)4 · nH2O

Classification of CharoiteHide

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9.DG.92

9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains

70.1.2.3

70 : INOSILICATES Column or Tube Structures
1 : Column or Tube Structures with columnar silicate units

17.1.14

17 : Silicates Containing other Anions
1 : Silicates with fluoride (not containing Al)

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 CharoiteHide

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Colour:

Violet to deep lilac, whitish-grey to brown

Comment:

Material from the type locality is vivid purple, due to trace manganese. Whitish-gray to brown from Patyn Mt.

Hardness:

VHN50=412 kg/mm2 - Vickers

Cleavage:

Distinct/Good
Good in three directions.

Density:

2.54 g/cm3 (Measured) 2.77 g/cm3 (Calculated)

Optical Data of CharoiteHide

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RI values:

_n_α = 1.550 _n_β = 1.553 _n_γ = 1.559

2V:

Measured: 28° to 30°, Calculated: 72°

δ = 0.009

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

Optical Extinction:

X = b, Z ∧ c = 5°.

Comments:

X= rose
Z= colorless

Chemistry of CharoiteHide

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Mindat Formula:

(K,Sr)15-16(Ca,Na)32[Si6O11(O,OH)6]2[Si12O18(O,OH)12]2[Si17O25(O,OH)18]2(OH,F)4 · ~3H2O

Common Impurities:

Al,Fe,Mn,Sr,Ba

Crystallography of CharoiteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 32.296 Å, b = 19.651 Å, c = 7.16 Å
β = 96.3°

Ratio:

a:b:c = 1.643 : 1 : 0.364

Morphology:

Fibrous, massive.

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Murun massif, Russia. Data from the type description.

Geological EnvironmentHide

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Geological Setting:

Potassic feldspar metasomatites

Type Occurrence of CharoiteHide

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Place of Conservation of Type Material:

University of Rome, Rome, Italy, number 24352.
A.E. Fersman Mineralogical Museum, Moscow, Russia.

Geological Setting of Type Material:

K-feldspar metasomatites at the contact of nepheline- and aegirine-syenites with limestones.

Associated Minerals at Type Locality:

Synonyms of CharoiteHide

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Other Language Names for CharoiteHide

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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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IR Spectrum:

The IR spectrum shows the presence of both molecular
water and hydroxyl.

Thermal Behaviour:

About 2.4% H2O is lost up to 300° and l.3% more to 600°. Small endothermic effects are noted at 440°, 760°, and 970°.

Notes:

Insoluble in acids.

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Charoite in petrologyHide

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Internet Links for CharoiteHide

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References for CharoiteHide

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Reference List:

Hawthorne, Frank C., Burke, Ernst A. J., Ercit, T. Scott, Grew, Edward S., Grice, Joel D., Jambor, John L., Puziewicz, Jacek, Roberts, Andrew C., Vanko, David A. (1988) New Mineral Names. American Mineralogist, 73 (1-2) 189-199

Matesanz, E., Garcia-Guinea, J., Crespo-Feo, E., Lopez-Arce, P., Valle-Fuentes, F.J., Correcher, V. (2008) The high-temperature behavior of charoite. The Canadian Mineralogist: 46: 1207-1213.

Rozhdestvenskaya, I., Mugnaioli, E., Czank, M., Depmeier, W., Kolb, U., Reinholdt, A., Weirich, T. (2010) The structure of charoite, (K,Sr,Ba,Mn)15–16(Ca,Na)32(Si70(O,OH)180)4.0._n_H2O, solved by conventional and automated electron diffraction. Mineralogical Magazine, 74 (1) 159-177 doi:10.1180/minmag.2010.074.1.159

Rozhdestvenskaya, I.V., Mugnaioli, E., Czank, M., Depmeier, W., Kolb, U., Merlino, S. (2011) Essential features of the polytypic charoite-96 structure compared to charoite-90. Mineralogical Magazine: 75: 2833-2846.

Localities for CharoiteHide

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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.