Mineral Information and Data:

Bartelkeite
PbFe2+Ge3O8 [CNMNC approved formula]

Named for Wolfgang Bartelke, mineral collector and specialist in Tsumeb mineral.

IMA status : Approved Species 1981 (IMA1979-029)
CLASSIFICATION 
Dana
(8th edition) :
07.06.02.01  
  (07) Multiple Oxides
  (07.06) where A (B)4 X9
  (07.06.02)
  
Nickel-Strunz
(10th edition) :
09.JA.10
  (09) Silicates
  (09.J) Germanates
  (09.JA)
  
Crystal system: Monoclinic System
Point group (H-M): 2 — sphenoidal
Space group: P21
Crystal Habit: Crystals, to 1 mm, tabular on {101} or acicular on {101}; {111} and {010} also observed.
  
Color: Colorless, white to very pale greenish
Diaphaneity: Transparent
Luster: Subadamantine
Hardness (Mohs): ~4
Measured Density: 4.97 (calculated) g/cm3
Cleavage: {101}, distinct
Streak: White
  
Geologic Setting: A very rare mineral in cavities in oxidized primary germanium ore from a dolostone-hosted hydrothermal polymetallic ore deposit.
Mineral Association: Germanite, reniĀ“erite, tennantite, galena
  

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