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Bernardite

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Formula:
Tl(As,Sb)
 
5
S
 
8
System:MonoclinicColour:Black
Lustre:DullHardness:2
Name:For Jan H. Bernard, mineralogist, Geological Survey of Czechoslovakia.
This page provides mineralogical data about Bernardite.

Classification of Bernardite

IMA status:Approved 1987
Strunz 8th edition ID:2/E.14-20
Nickel-Strunz 10th (pending) edition ID:2.HD.50

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
H : Sulfosalts of SnS archetype
D : With Tl
Dana 8th edition ID:3.8.14.2

3 : SULFOSALTS
8 : 1 < ø < 2
Hey's CIM Ref.:5.5.9

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 Bernardite

Type Locality:Allchar (Alsar), Roszdan, Republic of Macedonia
Year of Discovery:1989

Occurrences of Bernardite

Geological Setting:Hydrothermal veins in Tl-As deposits

Physical Properties of Bernardite

Lustre:Dull
Diaphaneity (Transparency):Translucent
Colour:Black
Streak:Red
Hardness (Mohs):2
Fracture:Irregular/Uneven, Sub-Conchoidal
Density (measured):4.5 g/cm3
Density (calculated):4.105 g/cm3

Crystallography of Bernardite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b {P1 1 21/b} {P21/c} {P1 21/c 1} {P21/a}
Cell Parameters:a = 15.64Å, b = 8.03Å, c = 10.75Å
β = 91.27°
Ratio:a:b:c = 1.948 : 1 : 1.339
Unit Cell Volume:V 1,349.75 ų (Calculated from Unit Cell)
Morphology:Tabular crystals

Chemical Properties of Bernardite

Formula:
Tl(As,Sb)
 
5
S
 
8
Essential elements:As, S, Tl
All elements listed in formula:As, S, Sb, Tl

Relationship of Bernardite to other Species

Common Associates:
RealgarOrpimentHutchinsoniteWallisiteHatchite
LoránditeEdenharteriteErniggliiteStalderite
Related Minerals - Nickel-Strunz Grouping):

- +
2.HD.05Lorándite
TlAsS
 
2
2.HD.05Weissbergite
TlSbS
 
2
2.HD.15Christite
TlHgAsS
 
3
2.HD.20Jankovićite
Tl
 
5
Sb
 
9
(As,Sb)
 
4
S
 
22
2.HD.20Jankovicite
2.HD.25Rebulite
Tl
 
5
Sb
 
5
As
 
8
S
 
22
2.HD.30Imhofite
Tl
 
6
CuAs
 
16
S
 
40
2.HD.35Edenharterite
PbTlAs
 
3
S
 
6
2.HD.40Jentschite
TlPbAs
 
2
SbS
 
6
2.HD.45Hutchinsonite
(Tl,Pb)
 
2
As
 
5
S
 
9
2.HD.55Sicherite
TlAg
 
2
(As,Sb)
 
3
S
 
6
2.HD.60Gabrielite
Tl
 
6
Ag
 
3
Cu
 
6
(As,Sb)
 
9
S
 
21
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
(Tl,Pb)
 
2
As
 
5
S
 
9
5.5.8Wallisite
(Cu,Ag)TlPbAs
 
2
S
 
5
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
5.5.14Rohaite
(Tl,Pb,K)
 
2
Cu
 
8.7
Sb
 
2
S
 
4
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 Bernardite

Synonyms:
IMA1987-052
Other Languages:
German:Bernardit
Russian:Бернардит
Simplified Chinese:贝硫砷铊矿
Spanish:Bernardita

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 Bernardite

Reference List:

- +
American Mineralogist: 75: 1209.

Mineralogical Magazine: 53: 531-538.

Internet Links for Bernardite

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  • Bernardite details from Handbook of Mineralogy (PDF)
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    • Localities for Bernardite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (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.
    Republic of Macedonia
     
    • Roszdan
    		Pasava, J., Pertlik, F., Stumpfl, E. F., & Zemann, J. (1989). Bernardite, a new thallium arsenic sulphosalt from Allchar, Macedonia, with a determination of the crystal structure. Mineralogical Magazine, 53, 531-538. ; The Canadian Mineralogist Vol.32, pp. 649-665 (1994)
    Gunnar Farber specimens
    Switzerland
     
    • Wallis (Valais)
      • Binn Valley
        • Im Feld (Imfeld; Feld; Fäld)
    		No reference listed
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