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Geffroyite

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Geffroyit
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Geffroyit

schwarze Partien von Geffroyit, San Miguel Mine, Moctezuma, Sonora, Mexiko; BB 2 mm

Copyright: Joy Desor
Contribution: openpit 2020-02-29
Locality: San Miguel Prospect / Moctezuma / Moctezuma, Municipio / Sonora / Mexiko

Collectors Summary

Color braun mit einem cremfarbenen Farbton
Hardness (Mohs) 2.5
Crystal System kubisch, Fm3m

Chemism

Chem­ical formula

(Cu,Fe,Ag)9(Se,S)8

Empir­ical formula (anal­y­sis)

(Cu4.80Fe3.63Ag0.70)(Se4.65S3.35)

Chem­ical com­po­si­tion

Eisen, Kupfer, Selen, Silber, Schwefel

Unit weight: 1057.845445 u; Number of atoms in the formula: 17.13

Info

Empirical formula:

(Cu4.80Fe3.63Ag0.70)(Se4.65S3.35)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Sulfur

S

10.15

3.35

19.56

32.0655000

107.4194250

Iron

Fe

19.16

3.63

21.19

55.8452000

202.7180760

Copper

Cu

28.83

4.8

28.02

63.5463000

305.0222400

Selenium

Se

34.71

4.65

27.15

78.9630000

367.1779500

Silver

Ag

7.14

0.7

4.09

107.8682200

75.5077540

Anal­y­sis wt%

Cu : 29.12, Fe : 19.07, Ag : 5.49, Se : 34.95, S : 9.97 (Ref: Tschermaks Mineralogische und Petrographische Mitteilungen 82)

Strunz 9th edi­tion incl. updates

2.BB.15

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
B: Metallsulfide, M : S > 1 : 1 (hauptsächlich 2 : 1)
B: mit Nickel (Ni)
15:Pentlandit-Gruppe

Lapis Clas­sifica­tion

II/B.16-040

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
B: Sulfide, Selenide und Telluride mit Verhältnis Metall : S,Se,Te > 1:1
16: Sulfide mit vorherrschend Nickel, Kobalt, Rhodium und Palladium; Pentlandit-Gruppe

Clas­sifica­tion by Hölzel

2.BB.320

2: SULFIDES
B: Sulfides (etc) with Me/S > 1/1 (mostly 2/1)
B: With Ni,Fe,Co,Cu
3: Pentlandite-Group

Dana 8th edi­tion

02.07.01.06

02: Sulfide Minerals
07: Sulfides - Including Selenides and Tellurides where Am Bn Xp, with (m+n):p=9:8
01: Pentalndite Group (Isometric: Fm3m)

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

Pentlandite Group

Optical Properties

Color

braun mit einem cremfarbenen Farbton

Diaphane­ity (Trans­parency)

opak

Crystallography

Crystal Sys­tem

kubisch

Class (H-M)

m3m

Space Group number

225

Space Group

Fm3m

Cell param­e­ters a (Å)

10.889

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

-

Cell param­e­ters a/b or c/a

1

Cell param­e­ters c/b

-

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

1291.112

X-Ray Pow­der Diffrac­tion

3.282(90),
3.145(90),
2.436(40),
2.094(60),
1.925(100),
1.818(40),
1.660(50),
1.112(60)

XRD chart Geffroyite

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

Physical Properties

Hard­ness (Mohs)

2.5

VHN (Hard­ness Vick­ers)

70 (15g)

Density (g/cm³)

5.39

5.442 ( ρ calc. Mineralienatlas )

Preface

Name from

Jaques Geffroy, Metallurge für die französische Atomenergiebehörde

Author (Name, Year)

Johan & Picot & Ruhlmann, 1982

References

Tschermaks Mineralogische und Petrographische Mitteilungen 29 (1982), 151

American Mineralogist 67 (1982), 1074–1075

IMA group assignments


 
 
Ag(Fe,Ni)8S8
kubisch
Fm3m

 
 
Co9S8
kubisch
Fm3m

 
 
(Cu,Fe,Ag)9(Se,S)8
kubisch
Fm3m

 
 
Rh3(Ni,Fe)32S32
kubisch
F43m

 
 
(Fe,Ni)9S8
kubisch
Fm3m

 
 
Cu(Fe,Ni)8S8
 
 

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Actuality: 13. May 2022 - 15:58:51

Other languages

German

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English

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French

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Russian

Жеффруаит

CNMNC (IMA)-Number

IMA 1980-090

CNMNC symbol

Symbol

Gef

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English pages

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