Chegemite (original) (raw)

A valid IMA mineral species

About ChegemiteHide

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Colour:

Pink, yellow-pink to white.

Crystal System:

Orthorhombic

Name:

from the Chegem River where the new mineral was discovered in the headwater tributary-area

Isostructural with:

Alleghanyite, Chondrodite, Edgrewite, Hydroxylclinohumite, Jerrygibbsite, Kumtyubeite, Leucophoenicite, Manganhumite, Norbergite, Reinhardbraunsite, Ribbeite, Sonolite

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:39004:2

9024ac1d-f3a3-4e8c-8203-1e6ddd26d4fc

IMA Classification of ChegemiteHide

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Type description reference:

Galuskin, Evgeny V., Gazeev, Viktor M., Lazic, Biljana, Armbruster, Thomas, Galuskina, Irina O., Zadov, Aleksander E., Pertsev, Nikolai N., Wrzalik, Roman, Dzierżanowski, Piotr, Gurbanov, Anatoly G., Bzowska, Grażyna (2009) Chegemite Ca7(SiO4)3(OH)2 a new humite-group calcium mineral from the Northern Caucasus, Kabardino-Balkaria, Russia. European Journal of Mineralogy, 21 (5) 1045-1059 doi:10.1127/0935-1221/2009/0021-1962

Classification of ChegemiteHide

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9.AF.

9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination

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 ChegemiteHide

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Colour:

Pink, yellow-pink to white.

Hardness:

VHN100=315 - Vickers

Cleavage:

Imperfect/Fair
(010)

Density:

2.86(1) g/cm3 (Measured) 2.892 g/cm3 (Calculated)

Optical Data of ChegemiteHide

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RI values:

_n_α = 1.621(2) _n_β = 1.626(3) _n_γ = 1.630(2)

2V:

Measured: -81° (5), Calculated: -78°

δ = 0.009

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

Optical Extinction:

X = a, Y = b, Z = c

Chemistry of ChegemiteHide

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Mindat Formula:

Ca7(SiO4)3(OH)2

Crystallography of ChegemiteHide

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Crystal System:

Orthorhombic

Class (H-M):

m m m _(_2/_m_2/_m_2/m ) - Dipyramidal

Cell Parameters:

a = 5.0696(1) Å, b = 11.3955(1) Å, c = 23.557(3) Å

Ratio:

a:b:c = 0.445 : 1 : 2.067

Twinning:

Twins, probably on (110)

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of ChegemiteHide

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General Appearance of Type Material:

Granular aggregates with grain sizes up to 5 mm.

Place of Conservation of Type Material:

Fersman Mineralogical Museum in Moscow, Russia, with the number 3731/1 and the single grain used for structural investigation is deposited in the Museum of Natural History in Bern, Switzerland, with the number NMBE 39571.

Geological Setting of Type Material:

A rock-forming mineral in high-temperature skarns (sanadinite) in calcareous xenoliths in ignimbrites.

Associated Minerals at Type Locality:

Reference:

Galuskin, E.V., Gazeev, V.M., Lazic, B., Armbruster, T., Galuskina, I.O., Zadov, A.E., Pertsev, N.N., Wrzalik, R., Dzierzanowski, P., Gurbanov, A.G., Bzowska, G. (2009) Chegemite Ca7(SiO4)3(OH)2 - a new humite-group calcium mineral from the Northern Caucasus, Kabardino-Balkaria, Russia. European Journal of Mineralogy: 21: 1045-1059.

Synonyms of ChegemiteHide

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Relationship of Chegemite 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 ChegemiteHide

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References for ChegemiteHide

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Reference List:

Galuskin, Evgeny V., Gazeev, Viktor M., Lazic, Biljana, Armbruster, Thomas, Galuskina, Irina O., Zadov, Aleksander E., Pertsev, Nikolai N., Wrzalik, Roman, Dzierżanowski, Piotr, Gurbanov, Anatoly G., Bzowska, Grażyna (2009) Chegemite Ca7(SiO4)3(OH)2 a new humite-group calcium mineral from the Northern Caucasus, Kabardino-Balkaria, Russia. European Journal of Mineralogy, 21 (5) 1045-1059 doi:10.1127/0935-1221/2009/0021-1962

Localities for ChegemiteHide

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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.