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Schöllhornite

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About SchöllhorniteHide

Formula:
Na0.3CrS2 · H2O
Colour:
Grey
Lustre:
Metallic
Hardness:
2
Specific Gravity:
2.74 (Calculated)
Crystal System:
Trigonal
Name:
Named after Professor Robert Schöllhorn, Inorganic Chemical Institute, Munster University, Münster, Germany.
Found in an enstatite achondrite meteorite with other chromium-rich minerals.
Schöllhornite has probably formed by terrestrial weathering of caswellsilverite.


Classification of SchöllhorniteHide

Approved
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.)
2.9.17.2

2 : SULFIDES
9 : AmBnXp, with (m+n):p = 1:1
4.4

4 : Oxysulphides

Physical Properties of SchöllhorniteHide

Metallic
Transparency:
Opaque
Colour:
Grey
Hardness:
Density:
2.74 g/cm3 (Calculated)

Optical Data of SchöllhorniteHide

Type:
Anisotropic
Anisotropism:
strong
Colour in reflected light:
gray in air bluish gray in oil

Chemical Properties of SchöllhorniteHide

Formula:
Na0.3CrS2 · H2O

Crystallography of SchöllhorniteHide

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

Occurrences of SchöllhorniteHide

Paragenetic Mode(s):

Type Occurrence of SchöllhorniteHide

Synonyms of SchöllhorniteHide

Other Language Names for SchöllhorniteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Clinoenstatite1 photo of Schöllhornite associated with Clinoenstatite on mindat.org.
Kamacite1 photo of Schöllhornite associated with Kamacite on mindat.org.
Troilite1 photo of Schöllhornite associated with Troilite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.FB.05CaswellsilveriteNaCrS2Trig. 3m (3 2/m) : R3m
2.FB.05CronusiteCa0.2CrS2 · 2 H2OTrig. 3m : R3m
2.FB.10ChvilevaiteNa(Cu,Fe,Zn)2S4Trig. 3m : R3m
2.FB.15Orickite2CuFeS2 · H2OHex.
2.FB.20RasvumiteKFe2S3Orth. mmm (2/m 2/m 2/m) : Cmcm
2.FB.20PautoviteCsFe2S3Orth. mmm (2/m 2/m 2/m) : Cmcm
2.FB.25ColimaiteK3VS4Orth. mmm (2/m 2/m 2/m) : Pnma

Related Minerals - Dana Grouping (8th Ed.)Hide

2.9.17.1CaswellsilveriteNaCrS2Trig. 3m (3 2/m) : R3m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

4.1BazhenoviteCa8S2(S3)(S2O3)(OH)12 · 20H2OMon. 2/m : P21/b
4.2KermesiteSb2S2OTric. 1 : P1
4.3SarabauiteCaSb3+10S6O10Mon. 2/m : B2/b
4.5Yushkinite(Mg,Al)V4+S2(OH)2Hex.
4.6VyalsoviteFeCaAlS(OH)5Orth.
4.7Valleriite(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6Hex.
4.8TochiliniteFe2+5-6(Mg,Fe2+)5S6(OH)10
4.9Haapalaite(Fe2+,Ni)2(Mg,Fe2+)1.61S2(OH)3.22Hex.
4.10ApuaniteFe2+Fe3+4Sb3+4O12STet. 4/mmm (4/m 2/m 2/m) : P42/mbc
4.11VersiliaiteFe2Fe4Sb6O16SOrth.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for SchöllhorniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Okada, A., Keil, K., Leonard, B. F., & Hutcheon, I. D. (1984). Schöllhornite, Na0. 3 (H2O) 1 [CrS2] a New Mineral in the Norton County Enstatite Achondrite. Meteoritics, 19, 284.
American Mineralogist (1985): 70: 638-643.

Internet Links for SchöllhorniteHide

Localities for SchöllhorniteHide

ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Antarctica
 
  • Eastern Antarctica
    • Queen Maud Land
      • Queen Fabiola Mts (Yamato Mts)
Nakamura-Messenger et al., (2011) The Formation of Wassonite: A New Titanium Monosulfide Mineral in the Yamato 691 Enstatite Chondrite: Workshop on Formation of the First Solids in the Solar System: LPI Contribution No. 1639, p. 9091. (Nov 2011)
USA (TL)
 
  • Kansas
    • Norton Co.
Amer.Min.(1985) 70, 638-643; Okada, A., Keil, K., Leonard, B. F., & Hutcheon, I. D. (1984). Schöllhornite, Na0. 3 (H2O) 1 [CrS2] a New Mineral in the Norton County Enstatite Achondrite. Meteoritics, 19, 284.
  • South Carolina
    • Lee Co.
      • Bishopville
I. Weber and A. Bischoff (1999). Microstructures in Pyroxenes from the Martian Meteorites Zagami and the Achondrites Bishopville (Aubrite), Hammadah Al Hamra 064, and Jalanash (Ureilites). Meteoritics & Planetary Science, vol. 34, Supplement, p. A120.
Yemen
 
  • Hadramawt Governorate
LPSC 26,659(1995); Zolensky, M. & A.Ivanov, Chemie der Erde 63,185-246(2003)
Mineral and/or Locality  
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