Shuiskite-(Cr) (original) (raw)

A valid IMA mineral species

About Shuiskite-(Cr)Hide

This section is currently hidden. Click the show button to view.

Formula:

Ca2Cr3+Cr3+2[Si2O6OH][SiO4](OH)2O

Colour:

Green to light-green and purple or greyish-purple

Specific Gravity:

3.432 (Calculated)

Crystal System:

Monoclinic

Name:

Named for being the CrO analogue of shuiskite-(Mg). The root name honors Vadim Prokopevich Shuisky (Вадим Прокопьевич Шуйский) (b. 1936), 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.

Unique IdentifiersHide

This section is currently hidden. Click the show button to view.

Long-form identifier:

mindat:1:1:31224:8

e15e1213-8ecc-49fd-bdbf-9a03ec19e674

IMA Classification of Shuiskite-(Cr)Hide

This section is currently hidden. Click the show button to view.

IMA Formula:

Ca2CrCr2[SiO4][Si2O6(OH)](OH)2O

Type description reference:

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

Classification of Shuiskite-(Cr)Hide

This section is currently hidden. Click the show button to view.

9.BG.

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

Mineral SymbolsHide

This section is currently hidden. Click the show button to view.

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-(Cr)Hide

This section is currently hidden. Click the show button to view.

Transparency:

Transparent, Translucent

Colour:

Green to light-green and purple or greyish-purple

Comment:

In aggregates, shuiskite-(Cr) is greenish-black under daylight or purplish-black under incandescent light; in separate crystals, it is green to light-green and purple or greyish-purple, respectively.

Cleavage:

Distinct/Good
{001} distinct.

Fracture:

Irregular/Uneven

Density:

3.432 g/cm3 (Calculated)

Optical Data of Shuiskite-(Cr)Hide

This section is currently hidden. Click the show button to view.

RI values:

_n_α = 1.757(3) _n_β = 1.788(6) _n_γ = 1.794(6)

2V:

Measured: 45° (10), Calculated: 46°

δ = 0.037

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

Dispersion:

Strong crossed dispersion

Optical Extinction:

Z ∧ b ≈ 12°.

Comments:

Thick crystals: pleochroism strong, absorption is: X (greyish) < Y (light greyish-green) < Z (brown).
Thin crystals: pleochroism weak: X (light greyish to nearly colourless) < Y (light greyish) < Z (light greyish-brown).

Chemistry of Shuiskite-(Cr)Hide

This section is currently hidden. Click the show button to view.

Mindat Formula:

Ca2Cr3+Cr3+2[Si2O6OH][SiO4](OH)2O

Crystallography of Shuiskite-(Cr)Hide

This section is currently hidden. Click the show button to view.

Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 19.2436(6) Å, b = 5.9999(2) Å, c = 8.8316(3) Å
α = 90°, β = 97.833(3)°, γ = 90°

Ratio:

a:b:c = 3.207 : 1 : 1.472

Unit Cell V:

1,010.18 ų (Calculated from Unit Cell)

Twinning:

Simple twins with a (001) composition plane.

X-Ray Powder DiffractionHide

This section is currently hidden. Click the show button to view.

Powder Diffraction Data:

Geological EnvironmentHide

This section is currently hidden. Click the show button to view.

Type Occurrence of Shuiskite-(Cr)Hide

This section is currently hidden. Click the show button to view.

General Appearance of Type Material:

On the walls of 0.5 to 1 cm thick fractures in chromitite in long prismatic to acicular crystals up to 0.1 × 0.5 × 7 mm elongated along [010] and slightly flattened on [100]. The crystals are commonly combined into radial, sheaf-like aggregates.

Place of Conservation of Type Material:

The holotype specimen of shuiskite-(Cr) was deposited in the collection of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia with the registration number 5481/1. A part of the holotype was deposited in the collection of the Canadian Museum of Nature, Ottawa, Canada with the catalogue number CMNMC 87302.

Geological Setting of Type Material:

Associated Minerals at Type Locality:

Reference:

Lykova, I.; Varlamov, D.; Chukanov, N.; Pekov, I.; Belakovskiy, D.; Ivanov, O.; Zubkova, N.; Britvin, S. (2020) Chromium Members of the Pumpellyite Group: Shuiskite-(Cr), Ca2CrCr2[SiO4][Si2O6(OH)](OH)2O, a New Mineral, and Shuiskite-(Mg), a New Species Name for Shuiskite. Minerals: 10: 390.

Other Language Names for Shuiskite-(Cr)Hide

This section is currently hidden. Click the show button to view.

Relationship of Shuiskite-(Cr) to other SpeciesHide

This section is currently hidden. Click the show button to view.

Other Members of this group:

Common AssociatesHide

This section is currently hidden. Click the show button to view.

Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

This section is currently hidden. Click the show button to view.

Fluorescence of Shuiskite-(Cr)Hide

This section is currently hidden. Click the show button to view.

Other InformationHide

This section is currently hidden. Click the show button to view.

Notes:

No reaction with a diluted HCl at room temperature.

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-(Cr)Hide

This section is currently hidden. Click the show button to view.

References for Shuiskite-(Cr)Hide

This section is currently hidden. Click the show button to view.

Reference List:

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-(Cr)Hide

This section is currently hidden. Click the show button to view.

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

This section is currently hidden. Click the show button to view.

- 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.