Mineral Information and Data:

Attakolite
CaMn2+Al4(HSiO4)(PO4)3(OH)4 [CNMNC approved formula]

Named in 1868 from the Greek for "salmon" for the pale pink color.

IMA status : Redefined IMA Approved; 1992 ()
CLASSIFICATION 
Dana
(8th edition) :
43.04.13.01  
  (43) Compound Phosphates
  (43.04) (Anhydrous Compound Anions With Hydroxyl or Halogen)
  (43.04.13)
  
Nickel-Strunz
(10th edition) :
08.BH.60
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BH) With medium-sized and large cations, (OH,etc.):RO4 = 1:1
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 17.18Å, b = 11.47Å, c = 7.32Å; β = 113.83°
Crystal Habit: Indistinctly crystalline, massive.
Twinning: Possible twin lamellae are observed in thin section.
  
Color: White to pale red; colorless in thin section.
Diaphaneity: Transparent
Hardness (Mohs): 5
Measured Density: 3.09 - 3.23 g/cm3
  
Geologic Setting: In an iron deposit.
Mineral Association: Berlinite, lazulite, trolleite, apatite, svanbergite, pyrophyllite, hematite, calcite, quartz.
  

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