Shuiskite-(Mg) (original) (raw)

A valid IMA mineral species

About Shuiskite-(Mg)Hide

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Formula:

Ca2MgCr3+2[Si2O6OH][SiO4](OH)2(OH)

Colour:

Dark brown with a violet tint

Crystal System:

Monoclinic

Name:

Named in honor of Vadim Prokopevich Shuisky (Вадим Прокопьевич Шуйский) (1935-2000), a lithologist and researcher of the sedimentary strata of the Urals, Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russia. It was formerly named just shuiskite, but with the discovery of a Cr>Mg dominant end-member (subsequently named shuiskite-(Cr)), the -(Mg) suffix was added.

Pumpellyite Group.
Cr analogue of Pumpellyite-(Mg).

Old note: According to Nagashima et al. (2010), it is questionable whether shuiskite is an independent mineral species - in their original description, Ivanov et al. (1981) assigned all Cr3+ ions to the Y site, but the distribution of Cr among the X and Y sites has not been determined.

New note: not questionable. Shuiskite-(Mg) is the Mg-OH analogue of shuiskite-(Cr) (IMA nomenclature proposal approved in March 2020).

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:3642:5

a4dbea7a-ae42-4837-ae9c-5d5236a540be

IMA Classification of Shuiskite-(Mg)Hide

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IMA Formula:

Ca2MgCr2(Si2O7)(SiO4)(OH)2 · H2O

Approval history:

shuiskite was the previous name, but with the discovery of a Cr>Mg dominant end-member (subsequently named shuiskite-(Cr)), the -(Mg) suffix was added.

Type description reference:

Classification of Shuiskite-(Mg)Hide

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9.BG.20

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

58.2.2.9

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)

16.15.5

16 : Silicates Containing Aluminum and other Metals
15 : Aluminosilicates of V and Cr

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.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

Physical Properties of Shuiskite-(Mg)Hide

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Colour:

Dark brown with a violet tint

Streak:

Light greenish brown

Density:

3.24 g/cm3 (Measured) 3.35 g/cm3 (Calculated)

Optical Data of Shuiskite-(Mg)Hide

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RI values:

_n_α = 1.725 - 1.733 _n_β = 1.762 - 1.772 _n_γ = 1.769 - 1.775

2V:

Measured: 40° to 50°, Calculated: 30° to 46°

δ = 0.044

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

Comments:

X = blue-violet; Y = yellowish green; Z = dark violet

Chemistry of Shuiskite-(Mg)Hide

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Mindat Formula:

Ca2MgCr3+2[Si2O6OH][SiO4](OH)2(OH)

Common Impurities:

Ti,Fe,Mn,Na,K,H20

Crystallography of Shuiskite-(Mg)Hide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 8.89 Å, b = 5.84 Å, c = 19.41 Å
β = 98°

Ratio:

a:b:c = 1.522 : 1 : 3.324

Unit Cell V:

997.91 ų (Calculated from Unit Cell)

Morphology:

radiating aggregates of ¯brous prismatic crystals, to 1 cm.

Comment:

Space Group: A2/m:

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of Shuiskite-(Mg)Hide

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Place of Conservation of Type Material:

Ural Geological Museum, Mining Institute, Yekaterinburg (Sverdlovsk); Mining Institute, St. Petersburg, 1227/1; A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 81684.

Associated Minerals at Type Locality:

Reference:

Ivanov, O.K., V.A. Arkhangel'skaya, L.O. Miroshnikova, and T.A. Shilova (1981) Shuiskite, the chromium analog of pumpellyite, from the Bisersk deposit, Urals. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 110: 508-512.

Synonyms of Shuiskite-(Mg)Hide

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Other Language Names for Shuiskite-(Mg)Hide

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Relationship of Shuiskite-(Mg) 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 Shuiskite-(Mg)Hide

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References for Shuiskite-(Mg)Hide

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Reference List:

Lykova, Inna S., Varlamov, Dmitry A., Chukanov, Nikita V., Pekov, Igor V., Zubkova, Natalia V. (2018) Crystal chemistry of shuiskite and chromian pumpellyite-(Mg) European Journal of Mineralogy, 30 (6) 1133-1139 doi:10.1127/ejm/2018/0030-2789

Lykova, Inna, Varlamov, Dmitry, Chukanov, Nikita, Pekov, Igor, Belakovskiy, Dmitry, Ivanov, Oleg, Zubkova, Natalia, Britvin, Sergey (2020) Chromium Members of the Pumpellyite Group: Shuiskite-(Cr), Ca2CrCr2[SiO4]Si2O6(OH)2O, a New Mineral, and Shuiskite-(Mg), a New Species Name for Shuiskite. Minerals, 10 (5) 390 doi:10.3390/min10050390

Localities for Shuiskite-(Mg)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.