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Muthmannite

Collectors Summary

Color schwärzlich gelb, bronze gelb, grauweiß
Streak color schwarz
Lustre Metallglanz
Hardness (Mohs) 2.5
Cleavages vollkommen in der Zone der Elongation
Fracture uneben
Solubility +++ HNO3, HCl
Crystal System monoklin, P2/m

Chemism

Chem­ical formula

AuAgTe2

Chem­ical com­po­si­tion

Gold, Silber, Tellur

Unit weight: 560.040772 u; Number of atoms in the formula: 4

Info

Empirical formula:

AuAgTe2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Silver

Ag

19.26

1

25.00

107.8682200

107.8682200

Tellurium

Te

45.57

2

50.00

127.6030000

255.2060000

Gold

Au

35.17

1

25.00

196.9665520

196.9665520

Anal­y­sis wt%

Au : 34.21, Ag : 19.06, Te : 46.41 (Ref: American Mineralogist 2004)

Strunz 9th edi­tion incl. updates

2.CB.85

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
C: Metallsulfide, M : S = 1 : 1 (und ähnliche)
B: mit Zink (Zn), Eisen (Fe), Kupfer (Cu), Silber (Ag), usw.
85:Muthmannit-Gruppe

Lapis Clas­sifica­tion

II/B.07-070

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
B: Sulfide, Selenide und Telluride mit Verhältnis Metall : S,Se,Te > 1:1
7: Sulfide, Selenide und Telluride mit vorwiegend Kupfer und Silber/Gold

Clas­sifica­tion by Hölzel

2.CB.940

2: SULFIDES
C: Sulfides (etc) with Me/S=1/1
B: With Zn,Cu (etc), Coordination Number ~[4] Framework of Cornersharing Tetrahedra: Sphalerite-Germanite-Family
9: Unclassified (with Te)

Dana 8th edi­tion

02.08.25.01

02: Sulfide Minerals
08: Sulfides - Including Selenides and Tellurides where Am Bn Xp, with (m+n):p=1:1

IMA sta­tus

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

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

schwärzlich gelb, bronze gelb, grauweiß

Streak color

schwarz

Change in color

grauweiß in reflektiertem Licht

Diaphane­ity (Trans­parency)

opak

Lus­tre

Metallglanz

Pleochro­ism

sehr schwach

Anisotropism

sehr schwach

Reflec­tiv­ity: (Lambda nm) ↓, ↑, Ø

(420) 42.30, , 42.30
(440) 41.30, , 41.30
(460) 40.40, , 40.40
(480) 39.70, , 39.70
(500) 39.20, , 39.20
(520) 38.70, , 38.70
(540) 38.40, , 38.40
(560) 38.20, , 38.20
(580) 38.10, , 38.10
(600) 38.00, , 38.00
(620) 38.00, , 38.00
(640) 38.00, , 38.00
(660) 38.10, , 38.10
(680) 38.20, , 38.20
(700) 38.40, , 38.40

Reflection chart Muthmannite

Reflec­tiv­ity Ø

39.00

Optical Data Luminescence

Lumi­nes­cence

keine Fluoreszenz bekannt

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

10

Space Group

P2/m

Cell param­e­ters a (Å)

5.124

Cell param­e­ters b (Å)

4.419

Cell param­e­ters c (Å)

7.437

Cell param­e­ters a/b or c/a

1.160

Cell param­e­ters c/b

1.683

Cell param­e­ters α

90°

Cell param­e­ters β

89.97

Cell param­e­ters γ

90°

Z

2

Volumne (ų)

168.396

X-Ray Pow­der Diffrac­tion

5.09(20),
3.03(100),
2.94(50),
2.113(80),
1.954(30),
1.698(30),
1.322(30),
1.038(30)

XRD chart Muthmannite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

2.5

VHN (Hard­ness Vick­ers)

53 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

11.04 (berechnet)

11.044 ( ρ calc. Mineralienatlas )

Cleav­ages

vollkommen in der Zone der Elongation

Frac­ture

uneben

Insta­bil­ity

+++ HNO3, HCl

(Co-)Type locality

(Co-)Type locality

Rumänien/Hunedoara, Kreis/Sacarimb (Nagyag)

Preface

Rare­ness

selten

Author (Name, Year)

Zambonini, 1911

References

Transactions (Doklady) of the USSR Academy of Sciences, Earth Science Sections 280 (1985), 159

Zeitschrift für Kristallographie 49 (1911), 246

American Mineralogist 89 (2004), 1505

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

Muthmannite

AuAgTe2

monoklin : 2/m : P2/m

2.CB.85

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

Petrovskaite

AuAg(S,Se)

monoklin : 2, m, 2/m : P2, Pm, P2/m

II/B.07-010

Uytenbogaardtite

Ag3AuS2

trigonal : 3m : R3c

II/B.07-020

Criddleite

TlAg2Au3Sb10S10

monoklin : 2/m, 2, m : A2/m, A2, Am

II/B.07-030

Penzhinite

(Ag,Cu)4Au(S,Se)4

hexagonal : 622 : P6322

II/B.07-040

Fischesserite

Ag3AuSe2

kubisch : 432 : I4132

II/B.07-050

Petzite

Ag3AuTe2

kubisch : 432 : I4132

II/B.07-060

Kurilite

Ag8Te3Se

trigonal : 3 : R3

II/B.07-065

Muthmannite

AuAgTe2

monoklin : 2/m : P2/m

II/B.07-070

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

Vulcanite

CuTe

orthorhombisch : mmm : Pmnm

2.CB.900

Empressite

AgTe

orthorhombisch : mmm : Pmnb

2.CB.920

Muthmannite

AuAgTe2

monoklin : 2/m : P2/m

2.CB.940

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

Tsumoite

BiTe

trigonal : 3m : P3m1

02.08.20.01

Sulphotsumoite

Bi3Te2S

trigonal : 3m : P3m1

02.08.20.02

Nevskite

Bi(Se,S)

trigonal : 3m : P3m1

02.08.20.03

Ingodite

Bi2TeS

02.08.20.04

Telluronevskite

Bi3TeSe2

trigonal : 3m : P3m1

02.08.20.05

Realgar

AsS

monoklin : 2/m : P21/n

02.08.22.01

Pararealgar

AsS

monoklin : 2/m : P21/c

02.08.22.02

Uzonite

As4S5

monoklin : 2/m : P21/m

02.08.22.03

Alacránite

As8S9

monoklin : 2/m : P2/c

02.08.22.04

Herzenbergite

SnS

orthorhombisch : mmm : Pbnm

02.08.23.01

Empressite

AgTe

orthorhombisch : mmm : Pmnb

02.08.24.01

Muthmannite

AuAgTe2

monoklin : 2/m : P2/m

02.08.25.01

Alternative Name

Simplified Chinese

板碲金银矿

CNMNC symbol

Symbol

Mma

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

German pages

DeWikiPedia - search for: Muthmannit
Google-Bilder-Suche - search for: Muthmannit
Mineralogisch-Petrographisches-Institut Hamburg - search for: Muthmannit

English pages

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

Russian pages

Webmineral.ru - search for: Мутманнит

Mineral Dealer

German pages

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Crystal-Treasure.com - search for: Muthmannit
Bosse - search for: Muthmannit

Locations with GPS information