Mineral Information and Data:

Zwieselite
Fe2+Mn2+PO4F [CNMNC approved formula]

Named for the locality: Rebenstein, Zweisel, Bavaria, Germany.

IMA status : Valid species (Pre-IMA 1841) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
41.06.01.01  
  (41) Anhydrous Phosphates Containing Hydroxyl or Halogen
  (41.06) where (A)2 (XO4) Zq
  (41.06.01) Zwieselite Group
  
Nickel-Strunz
(10th edition) :
08.BB.10
  (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
  
  
  
Other Properties: Gemstone Extremely Rare.

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