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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

(Co-)Type locality

(Co-)Type locality

Kanada/Québec/Abitibi Co./Montbray Township/Robb-Montbray Mine

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

Other languages

German

Montbrayit

Spanish

Montbrayita

English

Montbrayite

French

Montbrayite

Russian

Монтбрейит

Simplified Chinese

亮碲金矿

CNMNC symbol

Symbol

Mnb

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

German pages

 DeWikiPedia - search for: Montbrayit
Google-Bilder-Suche - search for: Montbrayit
Mineralienatlas.de (Forum) - search for: Montbrayit

English pages

 Mindat - search for: Montbrayite
Webmineral - search for:Montbrayite
Handbook-of-Mineralogy - search for: Montbrayite
RRUFF - Raman, XRD and other mineral data - search for: Montbrayite
RRUFF - References and PDF downloads - search for: Montbrayite
American-Mineralogist-Crystal-Structure-Database - search for: Montbrayite
Strahlen.org - search for: Montbrayite

Russian pages

 Webmineral.ru - search for: Монтбрейит

Mineral Dealer

German pages

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Locations with GPS information