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Barquillite

Collectors Summary

Color grau mit einem blass violetten Farbton
Lustre Metallglanz
Hardness (Mohs) 4 - 4.5
Crystal System tetragonal, I42m

Chemism

Chemical formula

Cu2(Cd,Fe)GeS4

Chemical composition

Cadmium, Eisen, Germanium, Kupfer, Schwefel

Unit weight: 426.26575 u; Number of atoms in the formula: 8

Info

Empirical formula:

Cu2(Cd0.75Fe0.25)GeS4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Sulfur

S

30.09

4

50.00

32.0655000

128.2620000
Iron

Fe

3.28

0.25

3.13

55.8452000

13.9613000
Copper

Cu

29.82

2

25.00

63.5463000

127.0926000
Germanium

Ge

17.04

1

12.50

72.6410000

72.6410000
Cadmium

Cd

19.78

0.75

9.38

112.4118000

84.3088500

Analysis wt%

Cu : 30.67, Fe : 2.20, Mn : 0.43, Cd : 20.38, Ge : 14.99, S : 29.42 (Ref: European Journal of Mineralogy 99)

Strunz 9th edition incl. updates

2.CB.20

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfoarsenide, Sulfoantimonide, Sulfobismuthide)
C: Metallsulfide, M : S = 1 : 1 (und ähnliche)
B: mit Zink (Zn), Eisen (Fe), Kupfer (Cu), Silber (Ag), usw.
20:Mawsonit-Gruppe

Lapis Classification

II/C.06-045

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
C: Sulfide mit Metall : S,Se,Te ~ 1:1
6: Stannit-Gruppe

Classification by Hölzel

2.CB.430

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
4: Luzonite-Hemusite-Group

Dana 8th edition

02.09.02.11

02: Sulfide Minerals
09: Sulfides - Including Selenides and Tellurides where Am Bn Xp, with (m+n):p=1:1
02: Stannite Group (Tetragonal: I-42m) A2BCS type

Mineral status

anerkanntes Mineral

Optical Properties

Color

grau mit einem blass violetten Farbton

Diaphaneity (Transparency)

opak

Lustre

Metallglanz

2V angle

Uniaxial

Pleochroism

sehr schwach

Reflectivity: (Lambda nm) ↓, ↑, Ø

(400) 24.80, , 24.80
(420) 24.80, , 24.80
(440) 24.70, , 24.70
(460) 24.40, , 24.40
(480) 24.20, , 24.20
(500) 23.80, , 23.80
(520) 23.50, , 23.50
(540) 23.30, , 23.30
(560) 23.20, , 23.20
(580) 23.00, , 23.00
(600) 23.10, , 23.10
(620) 23.10, , 23.10
(640) 23.30, , 23.30
(660) 23.50, , 23.50
(680) 23.30, , 23.30
(700) 22.90, , 22.90
Reflection chart Barquillite

Reflectivity Ø

23.68

Crystallography

Crystal System

tetragonal

Class (H-M)

42m

Space Group number

121

Space Group

I42m

Cell parameters a (Å)

5.45

Cell parameters b (Å)

-

Cell parameters c (Å)

10.6

Cell parameters a/b or c/a

1.945

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

2

Volume (ų)

314.846

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

4 - 4.5

VHN (Hardness Vickers)

240 (?g)

Density (g/cm³)

4.53 (berechnet)

4.496 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Spanien/Kastilien und León (Castilla y León)/Salamanca, Provinz/Ciudad Rodrigo, Comarca/Villar de la Yegua, Municipio/Mina Fuentes Villanas

Type material

Museo Geominero, Madrid, MGM-3000; Department of Geology, Salamanca, Spanien

Area of Crystallography and Mineralogy, Badajoz, Spanien

Institute for Mineralogy, Ruhr University, Bochum, Deutschland

Laboratory of Crystallography, Nancy, Frankreich

Preface

Name from

Für die Stadt Barquilla in Spanien, in der Nähe der Typlokalität

Author (Name, Year)

Murciego & Pascua & Babkine & Dusausoy & Medenbach & Bernhardt, 1999

References

European Journal of Mineralogy: 11: 111-117.

American Mineralogist 84 (1999), 1464.

Strunz Mineralogical Tables 9. Edition.

Other languages

German

Barquillit

Spanish

Barquillita

English

Barquillite

French

Barquillite

Russian

Баркиллит

Alternative Name

English

Barquilite

CNMNC (IMA)-Number

IMA 1996-050

CNMNC symbol

Symbol

Bql

Locations with GPS information

IDs

GUSID (Global unique identifier short form) sZPWl2Ekm0ms9luo8m_bWw
GUID (Global unique identifier) 97D693B1-2461-499B-ACF6-5BA8F26FDB5B
Database ID 299