Khristovite-(Ce) (original) (raw)

A valid IMA mineral species

About Khristovite-(Ce)Hide

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Formula:

(CaCe)(MgAlMn2+)F[Si2O7][SiO4](OH)

In the type material, the F:O ratio on the O/F site is 63:37.

Colour:

Brown to dark brown

Crystal System:

Monoclinic

Name:

Named in honor of Yevgeny Vladimirovich Khristov (Евгений Владимирович Христов) (1933-), a Russian geologist, and the author of many works on the tectonics of the Tien Shan.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2200:8

f2384786-8040-49f9-8a8b-dc262f23efff

IMA Classification of Khristovite-(Ce)Hide

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IMA Formula:

CaCe(MgAlMn2+)[Si2O7][SiO4]F(OH)

Classification of Khristovite-(Ce)Hide

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9.BG.05

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination

58.2.1a.9

58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
2 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)

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 Khristovite-(Ce)Hide

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Colour:

Brown to dark brown

Density:

4.05(5) g/cm3 (Measured) 4.11 g/cm3 (Calculated)

Optical Data of Khristovite-(Ce)Hide

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RI values:

_n_α = 1.773(2) _n_β = 1.790(2) _n_γ = 1.803(2)

2V:

Measured: 83° , Calculated: 80°

δ = 0.030

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

Optical Extinction:

In sections perpendicular to the acute bisectrix, Y ∧ elongation = 1.5-3°; in sections perpendicular to the obtuse bisectrix, extinction is parallel.

Comments:

X = very light yellow, Y = dark reddish brown, Z = brown.

Comments:

Absorption: Y > Z >> X.

Chemistry of Khristovite-(Ce)Hide

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Mindat Formula:

(CaCe)(MgAlMn2+)F[Si2O7][SiO4](OH)

In the type material, the F:O ratio on the O/F site is 63:37.

Crystallography of Khristovite-(Ce)Hide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 8.903(6) Å, b = 5.748(3) Å, c = 10.107(7) Å
β = 113.41(5)°

Ratio:

a:b:c = 1.549 : 1 : 1.758

Morphology:

Type material: {001} and {100} dominant, and subordinate {101} and {102} faces.

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of Khristovite-(Ce)Hide

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General Appearance of Type Material:

Elongate grains to 1.5 mm.

Place of Conservation of Type Material:

Fersman Mineralogical Museum, Moscow, Russia.
Museum of the IImenskij National Park.

Geological Setting of Type Material:

Associated Minerals at Type Locality:

Synonyms of Khristovite-(Ce)Hide

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Other Language Names for Khristovite-(Ce)Hide

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Relationship of Khristovite-(Ce) to other SpeciesHide

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Other Members of this group:

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 Khristovite-(Ce)Hide

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References for Khristovite-(Ce)Hide

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Reference List:

Pautov, L.A., Khorov, P.V., Ignatenko, K.I., Sokolova, E.V., and Nadezhina, T.N. (1993) Khristovite-(Ce), (Ca,REE)REE(Mg,Fe)AlMnSi3O11(OH)(F,O), a new mineral of the epidote group. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 122(3): 103-111 (in Russian).

Localities for Khristovite-(Ce)Hide

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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.