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Schöllhornite
A valid IMA mineral species
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About Schöllhornite
Formula:
Na0.3CrS2 · H2O
Colour:
Grey
Lustre:
Metallic
Hardness:
2
Specific Gravity:
2.74 (Calculated)
Crystal System:
Trigonal
Name:
Named in honor of Robert Schöllhorn (b. 1935), professor at the Inorganic Chemical Institute, Munster University, Münster, Germany.
Type Locality:
Found in an enstatite achondrite meteorite with other chromium-rich minerals.
Schöllhornite has probably formed by terrestrial weathering of caswellsilverite.
Schöllhornite has probably formed by terrestrial weathering of caswellsilverite.
Name Encoding
ASCII-7:
Schollhornite
Unique Identifiers
Mindat ID:
3861
Long-form identifier:
mindat:1:1:3861:0
IMA Classification of Schöllhornite
Approved
IMA Formula:
Na0.3CrS2·H2O
Approval year:
1984
First published:
1984
Classification of Schöllhornite
2.FB.05
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
F : Sulfides of arsenic, alkalies; sulfides with halide, oxide, hydroxide, H2O
B : With alkalies (without Cl, etc.)
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
F : Sulfides of arsenic, alkalies; sulfides with halide, oxide, hydroxide, H2O
B : With alkalies (without Cl, etc.)
2.9.17.2
2 : SULFIDES
9 : AmBnXp, with (m+n):p = 1:1
2 : SULFIDES
9 : AmBnXp, with (m+n):p = 1:1
4.4
4 : Oxysulphides
4 : Oxysulphides
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Slh | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Schöllhornite
Optical Data of Schöllhornite
Anisotropism:
strong
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 420nm | 15.4% | 17.0% |
| 440nm | 16.0% | 17.4% |
| 460nm | 16.6% | 19.3% |
| 480nm | 16.5% | 19.3% |
| 500nm | 16.4% | 19.4% |
| 520nm | 16.2% | 19.3% |
| 540nm | 16.0% | 19.3% |
| 560nm | 15.8% | 19.3% |
| 580nm | 15.5% | 19.3% |
| 600nm | 15.2% | 19.2% |
| 620nm | 15.2% | 19.1% |
| 640nm | 15.0% | 19.0% |
| 660nm | 15.1% | 19.1% |
| 680nm | 15.1% | 19.4% |
| 700nm | 14.8% | 19.0% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 19.4%.
R1 shown in black, R2 shown in red
Colour in reflected light:
gray in air bluish gray in oil
Chemistry of Schöllhornite
Mindat Formula:
Na0.3CrS2 · H2O
Element Weights:
Crystallography of Schöllhornite
Crystal System:
Trigonal
Cell Parameters:
a = 3.32 Å, c = 26.6 Å
Ratio:
a:c = 1 : 8.012
Unit Cell V:
253.92 ų (Calculated from Unit Cell)
Comment:
hexagonal setting
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.85 Å | (vsb) |
| 2.81 Å | (mb) |
| 2.53 Å | (mb) |
| 1.66 Å | (mb) |
| 4.43 Å | (wb) |
| 2.21 Å | (vvwb) |
Comments:
Synthetic
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 2: Planetesimal differentiation and alteration | 4.566-4.550 |
| 6 : Secondary asteroid phases | 4.566-4.560 |
Type Occurrence of Schöllhornite
General Appearance of Type Material:
Thin bands a few microns wide in caswellsilverite and as individual grains up to 250 µm in size, adjacent to caswellsilverite.
Place of Conservation of Type Material:
Institute of Meteoritics and Department of Geology, University of New Mexico, Albuquerque, New Mexico, USA.
Geological Setting of Type Material:
In an enstatite achondrite, probably as a terrestrial weathering product.
Associated Minerals at Type Locality:
Synonyms of Schöllhornite
Other Language Names for Schöllhornite
Common Associates
Associations Based on Photo Data:
| 1 photo of Schöllhornite associated with Clinoenstatite | MgSiO3 |
| 1 photo of Schöllhornite associated with 'Kamacite' | (Fe,Ni) |
| 1 photo of Schöllhornite associated with Troilite | FeS |
Related Minerals - Strunz-mindat Grouping
| 2.FB.05 | Caswellsilverite | NaCrS2 |
| 2.FB.05 | Cronusite | Ca0.2CrS2 · 2 H2O |
| 2.FB.10 | Chvilevaite | Na(Cu,Fe,Zn)2S4 |
| 2.FB.15 | Orickite | 2CuFeS2 · H2O |
| 2.FB.20 | Rasvumite | KFe2S3 |
| 2.FB.20 | Pautovite | CsFe2S3 |
| 2.FB.25 | Colimaite | K3VS4 |
Other Information
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 Schöllhornite
mindat.org URL:
https://www.mindat.org/min-3861.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Schöllhornite
Localities for Schöllhornite
Showing 6 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Antarctica | |
| Nakamura-Messenger et al. (2011) |
Israel | |
| Galuskin et al. (2023) |
Northwest Africa Meteorites | |
| Bunch et al. (2008) | |
USA (TL) | |
| Okada et al. (1984) +1 other reference |
| I. Weber and A. Bischoff (1999) |
Yemen | |
| LPSC 26 (1995) +1 other reference |
Quick NavTopAbout SchöllhorniteName EncodingUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Indarch meteorite, Hindarx, Aghjabadi District, Azerbaijan