Mineral Information and Data:

Vyacheslavite  
U4+PO4(OH) • 2.5H2O [CNMNC approved formula]

Named for Vyacheslav Gavilovich Melkov (1911-1991), Russian mineralogist.

IMA status : Approved Species 1984 ()
CLASSIFICATION 
Dana
(8th edition) :
40.04.08.03  
  (40) Hydrated Phosphates
  (40.04) where A+++ XO4 · x(H2O)
  (40.04.08) Ningyoite Group
  
Nickel-Strunz
(10th edition) :
08.DN.20
  (08) Phosphates, Arsenates, Vanadates
  (08.D) Phosphates, etc
  (08.DN) With only large cations
  
Crystal system:  
Point group (H-M):
  
  
  
Other Properties: Radioactive.
Comments: Radioactive.

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