Abswurmbachite

Abswurmbachite is a copper manganese silicate mineral ((Cu,Mn²⁺)Mn³⁺₆O₈SiO₄). It was first described in 1991 and named after Irmgard Abs-Wurmbach (born 1938), a German mineralogist. It crystallizes in the tetragonal system. Its Mohs scale rating is 6.5 and a specific gravity of 4.96. It has a metallic luster and its color is jet black, with light brown streaks.

Abswurmbachite
General
Category	Nesosilicate
Formula	(Cu,Mn2+)Mn3+6O8SiO4
IMA symbol	Abs[1]
Strunz classification	9.AG.05
Dana classification	7.5.1.4
Crystal system	Tetragonal
Crystal class	4/mmm – Ditetragonal dipyramidal
Unit cell	1640.82 Å3
Identification
Color	Black
Cleavage	None observed
Tenacity	Brittle
Mohs scale hardness	6.5
Luster	Metallic
Streak	Brownish black
Specific gravity	4.96 g/cm3
Density	4.96 g/cm3
Pleochroism	Non-pleochroic
Common impurities	Iron
References	[2]

See also

• List of minerals
• List of minerals named after people