Shuiskite Mineral Data

Shuiskite Mineral Data +

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General Shuiskite Information

Chemical Formula:

Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2·(H2O)

Composition:

Molecular Weight = 506.85 gm

Calcium 15.81 % Ca 22.13 % CaO

Magnesium 2.88 % Mg 4.77 % MgO

Aluminum 6.92 % Al 13.08 % Al₂O₃

Chromium 13.34 % Cr 17.44 % CrO

Iron 1.10 % Fe 1.42 % FeO

Silicon 14.96 % Si 32.01 % SiO₂

Hydrogen 0.80 % H 7.11 % H₂O

Oxygen 44.19 % O

______ ______

100.00 % 97.95 % = TOTAL OXIDE

Empirical Formula:

Ca₂Mg_0.6Al_0.3Fe²⁺_0.1Cr_1.3Al_0.7Si_2.7Al_0.3O₁₁(OH)₂·(H₂O)

Environment:

On the walls of fractures in chromitite.

IMA Status:

Valid Species (Pre-IMA) 1926

Locality:

From the Sarany deposit, Bisersk, in the Gorozavod district, Northern Ural Mountains, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for V. P. Shuisk, petrologist of the Ural Scientific Center, Yekaterinburg (Sverdlovsk), Russia.

Shuiskite Image

Images:

Shuiskite

Comments: Acicular shuiskite microcrystal sprays with epidote and prehnite.
Location: Quincy Mine, Hancock, Houghton County, Michigan, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Shuiskite Crystallography

Axial Ratios:

a:b:c =1.5226:1:3.3219

Cell Dimensions:

a = 8.897, b = 5.843, c = 19.41, Z = 4; beta = 98° V = 999.21 Den(Calc)= 3.37

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 1.487(1), 1.593(1), 2.9(0.9),

Physical Properties of Shuiskite

Cleavage:

[001] Perfect

Color:

Dark brown.

Density:

3.24

Diaphaniety:

Semitransparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

light greenish brown

Optical Properties of Shuiskite

Gladstone-Dale:

CI meas= -0.102 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.06 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2243,KPDmeas= 0.2333,KC= 0.2117

Optical Data:

Biaxial (-), a=1.725-1.733, b=1.762-1.772, g=1.769-1.775, bire=0.0420-0.0440, 2V(Calc)=30-46, 2V(Meas)=40-50.

Pleochroism (x):

blue violet.

Pleochroism (y):

yellowish green.

Pleochroism (z):

dark violet.

Calculated Properties of Shuiskite

Electron Density:

r_electron=3.35 gm/cc
note: r_Shuiskite=3.37 gm/cc.

Fermion Index

Fermion Index = 0.02319
Boson Index = 0.97681

Photoelectric:

PE_Shuiskite= 6.05 barns/electron
U=PE_Shuiskite x r_electron= 20.25 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Shuiskite is Not Radioactive

Shuiskite Classification

Dana Class:

58.2.2.9 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups

(58.2)with cations in [6] and higher coordination; single and double groups (n=1,2)

(58.2.2)Pumpellyite group

58.2.2.1 Julgoldite-(Fe++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(OH)2·(H2O) C 2/m 2/m

58.2.2.2 Julgoldite-(Fe+++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(O,OH)2·(H2O) A2/m 2/m

58.2.2.3 Okhotskite-(Mg)* Ca3(Mg,Mn)(Mn,Al,Fe)(SiO4)(Si2O7)(OH)2·(H2O) Mono

58.2.2.4 Okhotskite-(Mn++) Ca2(Mn,Mg)(Mn,Al,Fe)Si3O10(OH)4 A2/m 2/m

58.2.2.5 Pumpellyite-(Fe++) Ca2Fe(Al,Fe)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

58.2.2.6 Pumpellyite-(Fe+++) Ca2FeAl2(SiO4)(Si2O7)(OH,O)2·(H2O) A2/m 2/m

58.2.2.7 Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

58.2.2.8 Pumpellyite-(Mn++) Ca2(Mn,Mg)(Al,Mn,Fe)2(SiO4)(Si2O7(OH)2·(H2O) A2/m 2/m

58.2.2.9 Shuiskite Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

Strunz Class:

VIII/C.24-70 VIII - Silicates

VIII/C - Sorosilicates, mixed structure with [SiO4]2- "inseln" and [Si2O7]6- groups

VIII/C.24 - Pumpellyite group

VIII/C.24-10 Macfallite Ca2(Mn,Al)3(SiO4)(Si2O7)(OH)3 P 2₁/m 2/m

VIII/C.24-20 Sursassite Mn2Al3(SiO4)(Si2O7)(OH)3 P 2₁/m 2/m

VIII/C.24-30 Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

VIII/C.24-40 Pumpellyite-(Fe++) Ca2Fe(Al,Fe)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

VIII/C.24-42 Pumpellyite-(Fe+++) Ca2FeAl2(SiO4)(Si2O7)(OH,O)2·(H2O) A2/m 2/m

VIII/C.24-50 Pumpellyite-(Mn++) Ca2(Mn,Mg)(Al,Mn,Fe)2(SiO4)(Si2O7(OH)2·(H2O) A2/m 2/m

VIII/C.24-60 Julgoldite-(Fe++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(OH)2·(H2O) C 2/m 2/m

VIII/C.24-61 Julgoldite-(Fe+++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(O,OH)2·(H2O) A2/m 2/m

VIII/C.24-70 Shuiskite Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

VIII/C.24-80 Okhotskite-(Mg)* Ca3(Mg,Mn)(Mn,Al,Fe)(SiO4)(Si2O7)(OH)2·(H2O) Mono

VIII/C.24-80* Okhotskite-(Mn++) Ca2(Mn,Mg)(Mn,Al,Fe)Si3O10(OH)4 A2/m 2/m

VIII/C.24-90 Samfowlerite Ca14Mn3Zn2(Be,Zn)2Be6(SiO4)6(Si2O7)4(OH,F)6 P 2₁/c 2/m

Other Shuiskite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)

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Shuiskite

Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2·(H2O)
Dana No: 58.2.2.9 Strunz No: VIII/C.24-70
Locality:

Notes: