Mineral Information and Data:

Alforsite
Ba5(PO4)3Cl [CNMNC approved formula]

Named to honor Dr. John T. Alfors (1930- ), geologist, California Division of Mines, for his work on the type locality.

IMA status : Approved Species 1981 (IMA1980-039)
CLASSIFICATION 
Dana
(8th edition) :
41.08.05.02  
  (41) Anhydrous Phosphates Containing Hydroxyl or Halogen
  (41.08) where (A)5 (XO4)3 Zq
  (41.08.05) Morelandite Group
  
Nickel-Strunz
(10th edition) :
08.BN.05
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BN) With only large cations, (OH, etc.):RO4 = 0.33:1
  
Crystal system: Hexagonal System
Point group (H-M): 6/m — dipyramidal
Unit cell: a = 10.284 Å, c = 7.651 Å
Crystal Habit: Crystals are subhedral, to 0.2 mm, in very fine-grained masses.
  
Color: Colorless
Diaphaneity: Semitransparent
Luster: Vitreous
Hardness (Mohs): 5
Measured Density: 4.73-4.80 (calculated) g/cm3
Streak: White
  
Geologic Setting: In lenses and bands of barium silicate metasediments developed under hornblende-pyroxene hornfels facies near the contact with granite or granodiorite.
Mineral Association: Celsian, witherite, sanbornite, gillespite, fresnoite, fluorapatite, walstromite, titantaramellite, quartz, tourmaline, pyrite
  

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