Mineral Information and Data:

Abswurmbachite
Cu2+Mn3+6O8(SiO4) [CNMNC approved formula]

Named for Irmgard Abs-Wurmbach (1938-), German mineralogist.

IMA status : Approved Species 1990 (IMA1990-007)
CLASSIFICATION 
Dana
(8th edition) :
07.05.01.04  
  (07) Multiple Oxides
  (07.05) where A B X2
  (07.05.01) Humite group (Tetragonal: I41/acd) containing Si
  
Nickel-Strunz
(10th edition) :
09.AG.05
  (09) Silicates
  (09.A) Nesosilicates (Isolated tetrahedron) structures
  (09.AG) Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
  
Crystal system: Tetragonal System
Point group (H-M): 4/mmm (or 4/m 2/m 2/m) — ditetragonal-dipyramidal
Unit cell: a = 9.406 Å, c = 18.546 Å
Crystal Habit: Fibrous to elongate prismatic grains 1-5 x 6-50 mm, subhedral grains 5-30 mm
  
Color: Black
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): 6.5
Measured Density: 4.96 g/cm3
Streak: Brownish black
  
Polymorphism and Series: Forms a series with braunite.
Geologic Setting: In very low-grade, high-pressure metamorphic Mn, Al-rich quartzites.
Mineral Association: Quartz, shattuckite, tenorite, sursassite, piemontite, ardennite, rutile, hollandite,
clinochlore
  

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