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Bernardite

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Formula:
TlAs5S8
Some As may be replaced by Sb.
Colour:
Black
Lustre:
Dull
Hardness:
2
Specific Gravity:
4.5
Crystal System:
Monoclinic
Name:
In honor of Jan H. Bernard (1928-), Czech mineralogist, Professor of Geochemistry at Charles University, Prague (1955-1967) and Central Geological Institute (Prague). He is the author or co-author of numerous publications including Mineralogy of Czechoslovakia (1969 & 1981), Minerals and their localities (2004).
This page provides mineralogical data about Bernardite.


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Classification of BernarditeHide

Approved
Approval Year:
1987
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
3.8.14.2

3 : SULFOSALTS
8 : 1 < ø < 2
5.5.9

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

Physical Properties of BernarditeHide

Transparency:
Translucent
Colour:
Black
Streak:
Red
Hardness:
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
4.5 g/cm3 (Measured)    4.105 g/cm3 (Calculated)

Optical Data of BernarditeHide

Type:
Anisotropic
Reflectivity:
400nmR1=29.6%R2= 32.3%
420nmR1=28.9%R2= 31.8%
440nmR1=28.1%R2= 31.3%
460nmR1=27.4%R2= 30.6%
480nmR1=26.8%R2= 29.9%
500nmR1=26.0%R2= 28.9%
520nmR1=25.4%R2= 27.8%
540nmR1=25.0%R2= 26.7%
560nmR1=24.5%R2= 25.8%
580nmR1=24.0%R2= 25.1%
600nmR1=23.6%R2= 24.4%
620nmR1=23.3%R2= 23.9%
640nmR1=23.1%R2= 23.4%
660nmR1=22.9%R2= 23.0%
680nmR1=22.8%R2= 22.8%
700nmR1=22.8%R2= 22.5%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 32.3%.
R1 shown in black, R2 shown in red

Chemical Properties of BernarditeHide

Formula:
TlAs5S8

Some As may be replaced by Sb.

Crystallography of BernarditeHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 15.647(4) Å, b = 8.038(3) Å, c = 10.750(3) Å
β = 91.27(3)°
Ratio:
a:b:c = 1.947 : 1 : 1.337
Unit Cell V:
1,351.70 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Tabular crystals with prominent {100}, {012}, {210}, and {201}, {201}, {010}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.46 (65)
4.28 (74)
3.72 (55)
3.68 (63)
3.07 (65)
3.06 (100)
2.68 (59)
Comments:
Calculated.

Type Occurrence of BernarditeHide

Synonyms of BernarditeHide

Other Language Names for BernarditeHide

German:Bernardit
Simplified Chinese:贝硫砷铊矿
Spanish:Bernardita

Common AssociatesHide

EdenharteritePbTlAs3S6
ErniggliiteTl2SnAs2S6
HatchiteAgTlPbAs2S5
HutchinsoniteTlPbAs5S9
LoránditeTlAsS2
OrpimentAs2S3
RealgarAs4S4
StalderiteTl(Cu,Ag)(Zn,Fe,Hg)2(As,Sb)2S6
Wallisite(Cu,Ag)TlPbAs2S5
Associated Minerals Based on Photo Data:
Imhofite1 photo of Bernardite associated with Imhofite on mindat.org.
Realgar1 photo of Bernardite associated with Realgar on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.HD.05LoránditeTlAsS2Mon. 2/m : P21/b
2.HD.05WeissbergiteTlSbS2Tric. 1 : P1
2.HD.15ChristiteTlHgAsS3Mon. 2/m
2.HD.20JankovićiteTl5Sb9(As,Sb)4S22Tric. 1 : P1
2.HD.25RebuliteTl5Sb5As8S22Mon. 2/m : P21/b
2.HD.30ImhofiteTl5.8As15.4S26Mon. 2/m
2.HD.35EdenharteritePbTlAs3S6Orth.
2.HD.40JentschiteTlPbAs2SbS6Mon.
2.HD.45HutchinsoniteTlPbAs5S9Orth.
2.HD.55SicheriteTlAg2(As,Sb)3S6Orth.
2.HD.60GabrieliteTl6Ag3Cu6(As,Sb)9S21Tric. 1 : P1

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

3.8.14.1ParapierrotiteTlSb5S8Mon. 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.
5.5.10VrbaiteHg3Tl4As8Sb2S20Orth. mmm (2/m 2/m 2/m) : Cmca
5.5.11RebuliteTl5Sb5As8S22Mon. 2/m : P21/b
5.5.12GillulyiteTl2(As,Sb)8S13Mon.
5.5.13WeissbergiteTlSbS2Tric. 1 : P1
5.5.14Rohaite(Tl,Pb,K)2Cu8.7Sb2S4Orth.
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 BernarditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist: 75: 1209.
Pašava, J., Pertlik, F., Stumpfl, E.F. and Zemann, J. (1989): Bernardite, a new thallium arsenic sulphosalt from Allchar, Macedonia, with a determination of the crystal structure. Mineralogical Magazine, 53, 531-538.

Internet Links for BernarditeHide

Localities for BernarditeHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
Republic of Macedonia (TL)
 
  • Kavadarci
    • Rožden (Rozhden; 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); Boevl, B., Bermanec, V., Serafimovski, T., Lepitkoval, S., & Mikulcic, S. (2001). Allchar Mineral Assemblage. Geologica Macedonica, Vol. 15-16, p. 1-23 (2001-2002) Suppl
Gunnar Färber specimens
Switzerland
 
  • Wallis (Valais)
    • Binn Valley
      • Fäld (Imfeld; Im Feld; Feld)
Graeser, S. & Edenharter, A. (1997): Jentschite (TlPbAs2SbS6) - a new sulfosalt mineral from Lengenbach, Binntal (Switzerland). Mineralogical Magazine 61, 131-137.; Graeser, St., Schwander, H., Wulf, R. & Edenharter, A. (1992): Erniggliite (Tl2SnAs2S6), a new mineral from Lengenbach, Binntal (Switzerland): description and crystal structure determination based on data from synchrotron radiation. Schweiz. Mineral. Petrogr. Mitt., 72, 293-305.; Graeser, S., Schwander, H., Wulf, R. (1995): Stalderite TlCu(Zn,Fe,Hg)2As2S6 - a new mineral related to routhierite: description and crystal structure determination. Schweizerische mineralogische und petrographische Mitteilungen 75, 337-345; Roth, P. (2016): Zwillinge seltener Lengenbach-Mineralien. Schweizer Strahler 50(2), 28-29 (in German and French).
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