Mineral Information and Data:

Merrillite
Ca9NaMg(PO4)7 [CNMNC approved formula]

Named after George Perkins Merrill (1854-1929), meteorite specialist at U. S. National Museum, Smithsonian Institution, Washington, D.C. USA.

IMA status : Approved Species 1977 ()
CLASSIFICATION 
Dana
(8th edition) :
38.03.04.04  
  (38) Anhydrous Phosphates, etc
  (38.03) (A+ B++)3 (XO4)2
  (38.03.04) Whitlockite group
  
Nickel-Strunz
(10th edition) :
08.AC.45
  (08) Phosphates, Arsenates, Vanadates
  (08.A) Phosphates, etc. without additional anions, without H2O
  (08.AC) With medium-sized and large cations
  
Crystal system: Trigonal System
Point group (H-M): 3m — ditrigonal-pyramidal
  
  
Geologic Setting: Extraterrestrial bodies. The name merrillite was proposed in 1917.
  

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