Mineral Information and Data:

Barquillite
Cu2CdGeS4 [CNMNC approved formula]

Named after Barquilla, a village near the discovery locality - Fuentes Villanas mine, Barquilla Sn-Ge-Cd-Cu-Fe vein-type deposit, southwestern Salamanca, Spain.

IMA status : Approved Species 1999 (IMA1996-050)
CLASSIFICATION 
Dana
(8th edition) :
02.09.02.11  
  (02) Sulfides - Including Selenides and Tellurides
  (02.09) where Am Bn Xp, with (m+n):p=1:1
  (02.09.02) Stannite Group (Tetragonal: I-42m) A2BCS type
  
Nickel-Strunz
(10th edition) :
02.KA.10
  (02) Sulfides
  (02.K) Sulfarsenates, Sulfantimonates
  (02.KA) Sulfarsenates with (As,Sb)S4 tetrahedra
  
Crystal system: Tetragonal System
Point group (H-M): 42m (or 4 2m) — scalenohedral
Space group: I42m
Unit cell: a = 5.45(4) Å, c = 10.61(1) Å: Z = 2
Crystal Habit: Platy crystals, to 50 μm, commonly in rosette-like aggregates.
  
Color: In reflected light, gray with a violet tint
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): 4 - 4.5
Measured Density: 4.53 (calculated) g/cm3
  
Geologic Setting: Very rare, in a hydrothermal Sn–Ge–Cd–Cu–Fe vein deposit.
Mineral Association: Tetrahedrite, greenockite, chalcopyrite, bornite, mawsonite, stannite, stannoidite, mohite, digenite.
  

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