Mineral Information and Data:

Azoproite
Mg2(Fe3+,Ti,Mg)O2BO3 [CNMNC approved formula]

Named from a Russian acronym honoring the Study of Deep Zones of the Earth’s Crust (AZOPRO in Russian) sponsored in 1969 by the International Geological Association.

IMA status : Approved Species 1970 (IMA1970-021)
CLASSIFICATION 
Dana
(8th edition) :
24.02.01.03  
  (24) Borates - Anhydrous
  (24.02) where (A)2 BO2 [XO3]
  (24.02.01) Ludwigite Group (Space Group: Pbam)
  
Nickel-Strunz
(10th edition) :
06.AB.30
  (06) Borates
  (06.A) Monoborates
  (06.AB) BO3, without additional anions; 1(D) + OH, etc.
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
Unit cell: a = 9.27Å, b = 12.23Å, c = 3Å
Crystal Habit: As prismatic crystals, often striated and skeletal, to 2 cm, typically poorly terminated, with a diamond-shaped outline on {001}
  
Color: Black
Diaphaneity: Translucent to nearly opaque; transparent in thin section
Luster: Adamantine
Hardness (Mohs): 5.5
Measured Density: 3.63 g/cm3
Cleavage: On {010}, good, may be a parting; on {001}, distinct
Tenacity: Brittle
Fracture: Conchoidal
  
Geologic Setting: An uncommon late-stage mineral in the border zone in magnesian contact-metamorphic rocks associated with syenites.
Mineral Association: Calcite, ludwigite, brucite, clinohumite, baddeleyite, tazheranite, perovskite, geikielite, forsterite
  
Other Properties: Paramagnetic (weakly attracted to magnetic fields).

 

Azoproite
Black, acicular azoproite in matrix.
Origin : Tazheran Massif, Transbaikalia, Irkutsk District, Siberia.
Photo: Jeff Weissman

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