Mineral Information and Data:

Ansermetite
MnV5+2O6 • 4H2O [CNMNC approved formula]

Named for Stefan Ansermet (1964-), Swiss mineralogist.

IMA status : Approved Species 2003 (IMA2002-017)
CLASSIFICATION 
Dana
(8th edition) :
47.01.01.03  (This Dana# Added)
  (47) Vanadium Oxysalts
  (47.01) (Normal VO3)
  (47.01.01) Rossite Group
  
Nickel-Strunz
(10th edition) :
04.HD.30
  (04) Oxides and Hydroxides
  (04.H) V[5+,6+] Vanadates
  (04.HD) Inovanadates
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 13.17 Å, b = 10.13 Å, c = 6.983 Å, β = 111.57°
Crystal Habit: scaly crusts to 0.5 mm thickness, rarely minute wedge-shaped tabular crystals to 0.1 mm
Twinning: crystals prismatic
  
Color: Carmine red to wine red
Diaphaneity: Transparent
Luster: Adamantine
Hardness (Mohs): 3
Measured Density: 2.5 - 2.55 g/cm3
Cleavage: Perfect on {110}
Tenacity: Brittle
Streak: Orange
  
Geologic Setting: Metamorphosed synsedimentary exhalative Mn deposit. Unstable in air and aqueous solutions at temperatures above ~50-85 deg. C.
  

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