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Montbrayite

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Montbrayit
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Montbrayit

graumetallische Massen von Montbrayit in Quarz, Delamar Mine, Delamar, Lincoln County, Nevada, USA; BB < 1 mm

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-06-14
Locality: Lincoln Co. / Nevada / USA

Collectors Summary

Color gelblichweiß-met.
Lustre Metallglanz
Hardness (Mohs) 2.5
Cleavages {110}, {011}, {111}
Fracture flach, muschelig
Solubility + HNO3
Crystal System triklin, P1

Additional information / Summary

IN CNMNC Vorschlag 17-F wird Montbrayit neu definiert. Seine kristallchemische Formel wird (Au,Ag,Sb,Bi,Pb)23(Te,Sb,Bi,Bi,Pb)38, statt (Au,Sb)2Te3 wie zuvor berichtet.

Chemism

Chem­ical formula

(Au,Ag,Sb,Bi,Pb)23(Te,Sb,Bi,Bi,Pb)38

Empir­ical formula (anal­y­sis)

(Au1.73Bi0.10Sb0.06Pb0.06Ag0.04)Te3

Chem­ical com­po­si­tion

Antimon, Bismut, Blei, Gold, Silber, Tellur

Unit weight: 768.51210796 u; Number of atoms in the formula: 4.99

Info

Empirical formula:

(Au1.73Bi0.10Sb0.06Pb0.06Ag0.04)Te3

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Silver

Ag

0.56

0.04

0.80

107.8682200

4.3147288

Antimony

Sb

0.95

0.06

1.20

121.7601000

7.3056060

Tellurium

Te

49.81

3

60.12

127.6030000

382.8090000

Gold

Au

44.34

1.73

34.67

196.9665520

340.7521350

Lead

Pb

1.62

0.06

1.20

207.2100000

12.4326000

Bismuth

Bi

2.72

0.1

2.00

208.9803820

20.8980382

Anal­y­sis wt%

Au : 44.32, Ag : 0.55, Sb : 0.90, Pb : 1.61, Bi : 2.81, Te : 49.80 (Ref: Canadian Mineralogist 69)

Strunz 9th edi­tion incl. updates

2.DB.20

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
D: Metallsulfide mit M:S = 3:4 und 2:3
B: M:S = 2:3
20:Montbrayit-Gruppe

Lapis Clas­sifica­tion

II/D.15-010

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
D: Sulfide mit Metall : S,Se,Te < 1:1
15: Telluride mit Kupfer, Silber, Gold

Clas­sifica­tion by Hölzel

2.EA.220

2: SULFIDES
E: Me/S=1/2 (also < 1/2)
A: Me/S=1/2 with Cu,Ag,Au, etc.
2: Unclassified

Dana 8th edi­tion

02.11.08.01

02: Sulfide Minerals
11: Sulfides - Including Selenides and Tellurides where Am Bn Xp, with (m+n):p=2:3

IMA sta­tus

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

gelblichweiß-met.

Diaphane­ity (Trans­parency)

opak

Lus­tre

Metallglanz

Pleochro­ism

sehr schwach

Anisotropism

schwach

Reflec­tiv­ity: (Lambda nm) ↓, ↑, Ø

(400) 46.10, 49.90, 48.00
(420) 47.60, 51.30, 49.45
(440) 49.00, 52.80, 50.90
(460) 50.50, 54.50, 52.50
(480) 52.10, 55.90, 54.00
(500) 53.60, 57.10, 55.35
(520) 54.90, 58.20, 56.55
(540) 56.10, 59.00, 57.55
(560) 57.10, 59.70, 58.40
(580) 57.90, 60.30, 59.10
(600) 58.70, 60.80, 59.75
(620) 59.30, 61.20, 60.25
(640) 59.80, 61.50, 60.65
(660) 60.20, 61.90, 61.05
(680) 60.60, 62.10, 61.35
(700) 61.00, 62.40, 61.70

Reflection chart Montbrayite

Reflec­tiv­ity Ø

56.66

Crystallography

Crystal Sys­tem

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell param­e­ters a (Å)

10.8045(6)

Cell param­e­ters b (Å)

12.1470(6)

Cell param­e­ters c (Å)

13.4480(7)

Cell param­e­ters a/b or c/a

0.889

Cell param­e­ters c/b

1.107

Cell param­e­ters α

108.091(5)°

Cell param­e­ters β

104.362(5)°

Cell param­e­ters γ

97.471(5)°

Z

12

Volumne (ų)

1583.648

X-Ray Pow­der Diffrac­tion

7.48(10),
4.47(20),
3.22(10),
2.97(80),
2.92(80),
2.37(10),
2.27(10),
2.08(100)

XRD chart Montbrayite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

2.5

VHN (Hard­ness Vick­ers)

213 (100g)

Density (g/cm³)

9.94 (gemessen) 9.81 (berechnet)

9.669 ( ρ calc. Mineralienatlas )

Cleav­ages

{110}, {011}, {111}

Frac­ture

flach, muschelig

Tenac­ity

spröde

Insta­bil­ity

+ HNO3

Preface

Author (Name, Year)

Peacock & Thompson, 1945

References

Canadian Mineralogist 29 (1991), 223

Luca Bindi, Werner H. Paar, and Giovanni O. Lepore - MONTBRAYITE, (Au,Ag,Sb,Pb,Bi)23(Te,Sb,Pb,Bi)38, FROM THE ROBB-MONTBRAY MINE, MONTBRAY, QUÉBEC: CRYSTAL STRUCTURE AND REVISION OF THE CHEMICAL FORMULA - Canadian Mineralogist 2018 canmin.1700095; published ahead of print April 13, 2018, doi:10.3749/canmin.1700095

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Montbrayite

(Au,Ag,Sb,Bi,Pb)23(Te,Sb,Bi,Bi,Pb)38

triklin : 1 : P1

2.DB.20

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Montbrayite

(Au,Ag,Sb,Bi,Pb)23(Te,Sb,Bi,Bi,Pb)38

triklin : 1 : P1

II/D.15-010

Museumite

Pb5AuSbTe2S12

monoklin : 2/m, 2 : P21/m, P21

II/D.15-015

Nagyágite

Pb(Pb,Sb)S2(Te,Au)

monoklin : 2/m : P21/m

II/D.15-020

Buckhornite

(Pb2BiS3)(AuTe2)

orthorhombisch : mmm : Pmmn

II/D.15-030

Jonassonite

Au(Bi,Pb)5S4

II/D.15-040

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Cameronite

Cu5-x(Cu,Ag)3+xTe10 {x=0.43}

monoklin : 2/m : C2/c

2.EA.200

Montbrayite

(Au,Ag,Sb,Bi,Pb)23(Te,Sb,Bi,Bi,Pb)38

triklin : 1 : P1

2.EA.220

Nagyágite

Pb(Pb,Sb)S2(Te,Au)

monoklin : 2/m : P21/m

2.EA.240

Museumite

Pb5AuSbTe2S12

monoklin : 2/m, 2 : P21/m, P21

2.EA.250

Buckhornite

(Pb2BiS3)(AuTe2)

orthorhombisch : mmm : Pmmn

2.EA.260

Related minerals "Dana 8. Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Orpiment

As2S3

monoklin : 2/m : P21/n

02.11.01.01

Getchellite

AsSbS3

monoklin : 2/m : P21/a

02.11.01.02

Stibnite

Sb2S3

orthorhombisch : mmm : Pbnm

02.11.02.01

Antimonselite

Sb2Se3

orthorhombisch : mmm : Pbnm

02.11.02.02

Bismuthinite

Bi2S3

orthorhombisch : mmm : Pbnm

02.11.02.03

Guanajuatite

Bi2Se3

orthorhombisch : mmm : Pbnm

02.11.02.04

Metastibnite

Sb2S3

amorph

02.11.03.01

Wakabayashilite

[(As,Sb)6S9][As4S5]

orthorhombisch : mm2 : Pna21

02.11.04.01

Pääkkönenite

Sb2AsS2

monoklin : 2/m : C2/m

02.11.05.01

Laphamite

As2Se3

monoklin : 2/m : P21/n

02.11.06.01

Tetradymite

Bi2Te2S

trigonal : 3m : R3m

02.11.07.01

Tellurobismuthite

Bi2Te3

02.11.07.02

Tellurantimony

Sb2Te3

trigonal : 3m : R3m

02.11.07.03

Paraguanajuatite

Bi2(Se,S)3

trigonal : 3m : R3m

02.11.07.04

Kawazulite

Bi2(Te,Se,S)3

trigonal : 3m : R3m

02.11.07.05

Skippenite

Bi2Se2(Te,S)

trigonal : 3m : R3m

02.11.07.06

Montbrayite

(Au,Ag,Sb,Bi,Pb)23(Te,Sb,Bi,Bi,Pb)38

triklin : 1 : P1

02.11.08.01

Ottemannite

Sn2S3

orthorhombisch : mmm : Pnam

02.11.09.01

Other languages

German

Montbrayit

Spanish

Montbrayita

English

Montbrayite

French

Montbrayite

Russian

Монтбрейит

Simplified Chinese

亮碲金矿

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

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English pages

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Russian pages

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