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Rohaite

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Formula:
(Tl,Pb,K)
 
2
Cu
 
8.7
Sb
 
2
S
 
4
System:OrthorhombicHardness:3 - 3½
Name:Named after John Rose Hansen, professor of mineralogy.
This page provides mineralogical data about Rohaite.

Classification of Rohaite

IMA status:Approved
Strunz 8th edition ID:2/F.04-05
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:3.7.16.1

3 : SULFOSALTS
7 : ø = 2
Hey's CIM Ref.:5.5.14

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

Type Locality:Ilímaussaq complex, Narsaq, Kujalleq, Greenland
Year of Discovery:1978

Physical Properties of Rohaite

Diaphaneity (Transparency):Opaque
Hardness (Mohs):3 - 3½

Crystallography of Rohaite

Crystal System:Orthorhombic
Cell Parameters:a = 3.8Å, c = 20.98Å
Ratio:a:c = 1 : 5.521
Unit Cell Volume:V 0.00 ų (Calculated from Unit Cell)

Chemical Properties of Rohaite

Formula:
(Tl,Pb,K)
 
2
Cu
 
8.7
Sb
 
2
S
 
4
Simplified for copy/paste:(Tl,Pb,K)2Cu8.7Sb2S4
Idealised Formula:
TlCu
 
5
SbS
 
2
Essential elements:Cu, S, Sb, Tl
All elements listed in formula:Cu, K, Pb, S, Sb, Tl
Common Impurities:Pb,Fe

Relationship of Rohaite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.BD.UM2004-33-S:AgCuHgSe
(Ag,Cu)
 
8
Hg
 
3
(S,Se)
 
7
2.BD.05Imiterite
Ag
 
2
HgS
 
2
2.BD.10Gortdrumite
(Cu,Fe)
 
6
Hg
 
2
S
 
5
2.BD.15Balkanite
Cu
 
9
Ag
 
5
HgS
 
8
2.BD.15Danielsite
(Cu,Ag)
 
14
HgS
 
8
2.BD.20Donharrisite
Ni
 
8
Hg
 
3
S
 
9
2.BD.25Carlinite
Tl
 
2
S
2.BD.30Bukovite
Tl
 
2
(Cu,Fe)
 
4
Se
 
4
2.BD.30Murunskite
K
 
2
(Cu,Fe)
 
4
S
 
4
2.BD.30Thalcusite
Tl
 
2
Cu
 
3
FeS
 
4
2.BD.40Chalcothallite
Tl
 
2
(Cu,Fe)
 
6
SbS
 
4
2.BD.45Sabatierite
Cu
 
6
TlSe
 
4
2.BD.50Crookesite
Cu
 
7
(Tl, Ag)Se
 
4
2.BD.55Brodtkorbite
Cu
 
2
HgSe
 
2
Related Minerals - Hey's Index Grouping:

- +
5.5.1Lorándite
TlAsS
 
2
5.5.2Ellisite
Tl
 
3
AsS
 
3
5.5.3Imhofite
Tl
 
6
CuAs
 
16
S
 
40
5.5.4Simonite
TlHgAs
 
3
S
 
6
5.5.6Christite
TlHgAsS
 
3
5.5.6Routhierite
Tl(Cu,Ag)(Hg,Zn)
 
2
(As,Sb)
 
2
S
 
6
5.5.7Hutchinsonite
TlPbAs
 
5
S
 
9
5.5.8Wallisite
(Cu,Ag)TlPbAs
 
2
S
 
5
5.5.9Bernardite
Tl(As,Sb)
 
5
S
 
8
5.5.10Vrbaite
Tl
 
4
Hg
 
3
Sb
 
2
As
 
8
S
 
20
5.5.11Rebulite
Tl
 
5
Sb
 
5
As
 
8
S
 
22
5.5.12Gillulyite
Tl
 
2
(As,Sb)
 
8
S
 
13
5.5.13Weissbergite
TlSbS
 
2
5.5.15Vaughanite
TlHgSb
 
4
S
 
7
5.5.16Chalcothallite
Tl
 
2
(Cu,Fe)
 
6
SbS
 
4
5.5.17Pierrotite
Tl
 
2
Sb
 
6
As
 
4
S
 
16
5.5.18Parapierrotite
Tl(Sb,As)
 
5
S
 
8
5.5.19Criddleite
TlAg
 
2
Au
 
3
Sb
 
10
S
 
10
5.5.20Chabournéite
Tl
 
21-x
Pb
 
2x
(Sb,As)
 
91-x
S
 
147
(x = 0-17.5)

Other Names for Rohaite

Synonyms:
IMA1973-043
Other Languages:
German:Rohait
Simplified Chinese:硫锑铜铊矿
Spanish:Rohaita

Other Information

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

References for Rohaite

Reference List:

- +
American Mineralogist (1980): 65: 208-209.

Neues Jahrbuch für Mineralogie, Abhandlungen (1980): 138: 122-146.

Internet Links for Rohaite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Rohaite details from Handbook of Mineralogy (PDF)
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  • Localities for Rohaite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    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)
    Sven Karup-Møller and Emil Makovicky (2001) Thalcusite from Nakkaalaaq, the Ilímaussaq alkaline complex, South Greenland. Geology of Greenland Survey Bulletin 190, 127–130.
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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