Schollhornite Mineral Data

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General Schollhornite Information

Chemical Formula:

Na0.3CrS2•(H2O)

Composition:

Molecular Weight = 141.04 gm

Sodium 4.89 % Na

Chromium 36.87 % Cr

Hydrogen 1.43 % H

Sulfur 45.47 % S

Oxygen 11.34 % O

______

100.00 %

Empirical Formula:

Na_0.3CrS₂•(H₂O)

Environment:

Extra-terrestrial meteorite.

IMA Status:

Approved IMA 1985

Locality:

Waethering product of caswellsilverite in the Norton County enstatite achondrite. Link to MinDat.org Location Data.

Name Origin:

Named for Robert Schollhorn, German chemist.

Name Pronunciation:

Schollhornite + Pronunciation

Synonym:

Schoellhornite

Schollhornite Image

Images:

Click Here for Larger Schollhornite Image

Schollhornite Daubreelite Caswellsilverite

Comments: Polished section (PPL) of schiillhornite (Sh), coexisting with caswellsilverite (Cw), ferromagnesian alabandite (Ab) and daubreelite (Db). (AmMin, v70:638).
Location: Norton County (Kansas-Nebraska) enstatite achondrite meteorite. Scale: Scale bar is 0.08 mm.
© American Mineralogist

Schollhornite Crystallography

Axial Ratios:

a:c = 1:8.01204

Cell Dimensions:

a = 3.32, c = 26.6, Z = 3; V = 253.92 Den(Calc)= 2.77

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m ?

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

By Intensity(I/I_o): 8.85(1), 2.53(0.5), 2.8(0.5),

Physical Properties of Schollhornite

Cleavage:

{0001} Perfect

Color:

Gray.

Density:

2.7

Diaphaneity:

Opaque

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

1.5-2 - Talc-Gypsum

Luster:

Metallic

Optical Properties of Schollhornite

RL Anisotrophism:

Strong.

RL Color:

Gray in air, bluish gray in oil.

RL Pleochroism:

Distinct, white with yellowish tint to light gray with bluish or greenish tint.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Schollhornite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
420 nm	15.40	17.00
440 nm	16.00	17.40
460 nm	16.60	19.30
480 nm	16.50	19.30
500 nm	16.40	19.40
520 nm	16.20	19.30
540 nm	16.00	19.30
560 nm	15.80	19.30
580 nm	15.50	19.30
600 nm	15.20	19.20
620 nm	15.20	19.10
640 nm	15.00	19.00
660 nm	15.10	19.10
680 nm	15.10	19.40
700 nm	14.80	19.00

**Calculated Relative Intensity Colors of Schollhornite in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	540%	580%
R₁
R₂

Calculated Properties of Schollhornite

Electron Density:

Bulk Density (Electron Density)=2.72 gm/cc
note: Specific Gravity of Schollhornite =2.77 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Schollhornite}= 10.67 barns/electron
U=PE_{Schollhornite} x rElectron Density= 29.05 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Schollhornite is Not Radioactive

Schollhornite Classification

Dana Class:

02.09.17.02 (02)Sulfides - Including Selenides and Tellurides

(02.09)where Am Bn Xp, with (m+n):p=1:1

(02.09.17)Caswellsilverite Group

02.09.17.01 Caswellsilverite NaCrS2 R 3m 3 2/m

02.09.17.02 Schollhornite Na0.3CrS2•(H2O) R 3m ? 3m

02.09.17.03 Cronusite! Ca0.2(H2O)2CrS2 Rm, R 3m or R 32 Trig

Strunz Class:

02.FB.05 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.F - Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O

02.FB -With Alkalies (without Cl, etc.)

02.FB.05 Caswellsilverite NaCrS2 R 3m 3 2/m

02.FB.05 Schollhornite Na0.3CrS2•(H2O) R 3m ? 3m

02.FB.05 Cronusite! Ca0.2(H2O)2CrS2 Rm, R 3m or R 32 Trig

Other Schollhornite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Schollhornite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Ask about Schollhornite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Rockhounds Discussion Group on Yahoo Groups
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Print or Cut-and-Paste your Schollhornite Specimen Label here :

Schollhornite

Na0.3CrS2•(H2O)
Dana No: 02.09.17.02 Strunz No: 02.FB.05
Locality:

Notes: