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Bernardite

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Lengenbach Quarry, Im Feld (Imfeld; Feld; Fäld), Binn Valley, Wallis (Valais), Switzerland
© Stephan Wolfsried

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Formula:
Tl(As,Sb)
 
5
S
 
8
System:MonoclinicColour:Black
Lustre:MetallicHardness:2
Name:For Jan H. Bernard.
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

Physical Properties of Bernardite

Lustre:Metallic
Colour:Black
Hardness (Mohs):2

Crystallography of Bernardite

Crystal System:Monoclinic
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)

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

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
Cu
 
5
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,Pb)
 
5
(Sb,As)
 
21
S
 
34

Other Names for Bernardite

Synonyms:
IMA1987-052
Other Languages:
German:Bernardit
Russian:Бернардит
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.

Articles/Blogs about Bernardite

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    Localities for Bernardite

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    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
    		Min.Mag.(1989) 53, 531-538
    Switzerland
     
    • Wallis (Valais)
      • Binn Valley
        • Im Feld (Imfeld; Feld; Fäld)
    		No reference listed
    Mineral and/or Locality
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