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Rohaite

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Formula:
(Tl,Pb,K)2Cu8.7Sb2S4
Colour:
Black
Lustre:
Metallic
Hardness:
3 - 3½
Crystal System:
Orthorhombic
Name:
Named after John Rose-Hansen (2 May 1937, Copenhagen, Denmark - 18 September 2015), professor of mineralogy, University of Copenhagen, Denmark.
This page provides mineralogical data about Rohaite.


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Classification of RohaiteHide

Approved
2.BD.35

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
D : With Hg, Tl
3.7.16.1

3 : SULFOSALTS
7 : ø = 2
5.5.14

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
5 : Sulpharsenites etc. of Tl

Physical Properties of RohaiteHide

Metallic
Transparency:
Opaque
Colour:
Black
Comment:
In reflected light, yellowish cream to dull bluish gray.
Hardness:
3 - 3½ on Mohs scale
Hardness Data:
Could not be measured
Tenacity:
Malleable

Chemical Properties of RohaiteHide

Formula:
(Tl,Pb,K)2Cu8.7Sb2S4
IMA Formula:
(Tl,Pb,K)2Cu8.7Sb2S4
Idealised Formula:
TlCu5SbS2
Common Impurities:
Pb,Fe

Crystallography of RohaiteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 7.602(2) Å, b = 3.801(2) Å, c = 20.986(8) Å
Ratio:
a:b:c = 2 : 1 : 5.521
Unit Cell V:
606.39 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Rarely as euhedral and subhedral crystals (to 0.5 mm); in patchy aggregates.
Comment:
Space group P222, Pmm2, or Pmmm.

Type Occurrence of RohaiteHide

Synonyms of RohaiteHide

Other Language Names for RohaiteHide

German:Rohait
Simplified Chinese:硫锑铜铊矿
Spanish:Rohaita

Related Minerals - Nickel-Strunz GroupingHide

2.BD.UM2004-33-S:AgCuHgSe(Ag,Cu)8Hg3(S,Se)7
2.BD.05ImiteriteAg2HgS2Mon.
2.BD.10GortdrumiteCu24Fe2Hg9S23Tric. 1 : P1
2.BD.15BalkaniteCu9Ag5HgS8Mon. 2/m : P2/m
2.BD.15Danielsite(Cu,Ag)14HgS8Orth.
2.BD.20DonharrisiteNi3HgS3Mon. 2/m : B2/m
2.BD.25CarliniteTl2STrig. 3 : R3
2.BD.30BukoviteTl2(Cu,Fe)4Se4Tet.
2.BD.30MurunskiteK2(Cu,Fe)4S4Tet.
2.BD.30ThalcusiteTl2Cu3FeS4Tet.
2.BD.40ChalcothalliteTl2(Cu,Fe)6SbS4Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
2.BD.45SabatieriteCu6TlSe4Orth.
2.BD.50CrookesiteCu7(Tl, Ag)Se4Tet.
2.BD.55BrodtkorbiteCu2HgSe2Mon. 2/m : P21/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

5.5.1LoránditeTlAsS2Mon. 2/m : P21/b
5.5.2EllisiteTl3AsS3Trig. 3m : R3m
5.5.3ImhofiteTl5.8As15.4S26Mon. 2/m
5.5.4SimoniteTlHgAs3S6Mon. 2/m
5.5.6ChristiteTlHgAsS3Mon. 2/m
5.5.6RouthieriteTl(Cu,Ag)(Hg,Zn)2(As,Sb)2S6Tet. 4 2m : I4 2m
5.5.7HutchinsoniteTlPbAs5S9Orth.
5.5.8Wallisite(Cu,Ag)TlPbAs2S5Tric.
5.5.9BernarditeTlAs5S8Mon. 2/m : P21/b
5.5.10VrbaiteHg3Tl4As8Sb2S20Orth. mmm (2/m 2/m 2/m) : Cmca
5.5.11RebuliteTl5Sb5As8S22Mon. 2/m : P21/b
5.5.12GillulyiteTl2As7.5Sb0.3S13Mon.
5.5.13WeissbergiteTlSbS2Tric. 1 : P1
5.5.15VaughaniteTlHgSb4S7Tric.
5.5.16ChalcothalliteTl2(Cu,Fe)6SbS4Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
5.5.17PierrotiteTl2(Sb,As)10S16Orth. mm2 : Pna21
5.5.18ParapierrotiteTlSb5S8Mon. m
5.5.19CriddleiteTlAg2Au3Sb10S10Mon.
5.5.20ChabournéiteTl4Pb2(Sb,As)20S34Tric. 1 : P1

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 RohaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1980): 65: 208-209.
Neues Jahrbuch für Mineralogie, Abhandlungen (1980): 138: 122-146.

Internet Links for RohaiteHide

Localities for RohaiteHide

ⓘ - 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.
Denmark
 
  • Greenland
    • Kujalleq
      • Narsaq
American Mineralogist (1980): 65: 208-209.; Petersen, O.V. (2001): List of all minerals identified in the Ilímaussaq alkaline complex, South Greenland. Geology of Greenland Survey Bulletin. 190, 25-33
          • Kuannersuit Plateau (Kvanefjeld)
Petersen, O. V. & Johnsen, O. (2005): Mineral species first described from Greenland. Canadian Mineralogist, Special publication no. 8.
Mineral and/or Locality  
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