| |
 |
Schollhornite Mineral Data
|
|
|
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: |
Na0.3CrS2•(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:
|
|
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 Pyramidal H-M Symbol (3m) Space Group: R 3m ? |
| X Ray Diffraction: |
By Intensity(I/Io): 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: |
PESchollhornite = 10.67 barns/electron
U=PESchollhornite 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
Search for Schollhornite using:
[AOL]
[Bing]
[Dog Pile]
[GeoScienceWorld]
[HotBot]
[Ixquick]
[Lycos]
[MAMMA]
[Scirus]
[Teoma]
[WebCrawler]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Schollhornite :
Ask about Schollhornite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Espaņol
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:
|
|
| |
| |
|
| |
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.