Mineral Information and Data:

Barbosalite
Fe2+Fe3+2(PO4)2(OH)2 [CNMNC approved formula]

Named for Aluxio Licinio de Miranda Barbosa (1916- ), Professor of Geology, School of Mines, Ouro Preto, Brazil.

IMA status : Valid species (Pre-IMA 1955) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
41.10.01.04  
  (41) Anhydrous Phosphates Containing Hydroxyl or Halogen
  (41.10) where (A++ B++)3 (XO4)2 Zq
  (41.10.01) Lazulite Group
  
Nickel-Strunz
(10th edition) :
08.BB.40
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BB) With only medium-sized cations, (OH, etc.):RO4 about 1:1
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 7.31Å, b = 7.48Å, c = 7.52Å; β = 120.15°
Crystal Habit: As stout prismatic to pseudocubic crystals, may have a mosaic texture, to 0.25 mm; generally as microcrystalline to powdery coatings.
Twinning: Contact twins with (001) as composition surface
  
Color: Dark blue, blue-green
Diaphaneity: Translucent to nearly opaque
Luster: Vitreous to earthy
Hardness (Mohs): 6
Measured Density: 3.60 – 3.62 g/cm3
Streak: Dark blue
  
Polymorphism and Series: Dimorphous with lipscombite.
Geologic Setting: In complex granitic pegmatites, formed by oxidation and hydration of primary phosphates.
Mineral Association: Tavorite, hureaulite, heterosite, triphylite, vivianite, roscherite, rockbridgeite.
  

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