Mineral Information and Data:

Arapovite  
(K,[])(Ca,Na)2(U,Th)Si8O20 • H2O [CNMNC approved formula]

Named for Yu. A. Arapov (1907-1988), a famous geologist and author of many works on the geochemistry, mineralogy and petrology of Middle Asia.

IMA status : Approved Species 2003 (IMA2003-046)
CLASSIFICATION 
Dana
(8th edition) :
63.01.01.04  (This Dana# Added)
  (63) Cyclosilicate Condensed Rings
  (63.01) 4-membered rings
  (63.01.01) Steacyite Group
  
Nickel-Strunz
(10th edition) :
09.CH.10
  (09) Silicates
  (09.C) Cyclosilicates
  (09.CH) [Si4O12]8- 4-membered double rings
  
Crystal system: Tetragonal System
Point group (H-M): 4/mmm (or 4/m 2/m 2/m) — ditetragonal-dipyramidal
Unit cell: a = 7.5505Å, c = 14.7104Å
Crystal Habit: As inclusions and intergrown crystals
  
Color: Dark-green
Diaphaneity: Transparent
Luster: Vitreous
Hardness (Mohs): 5.5 - 6
Tenacity: Brittle
Fracture: Conchoidal
  
  
Synonyms/varieties: IMA2003-046
Other Properties: Radioactive.

 

Arapovite
Dark green prismatic arapovite crystals with rectangular shapes.
Origin: Dara-i-Pioz Glacier, Hait, Alayskiy (Alai) Range,
Tien Shan Mountains, Tajikistan.
Photo: © Rruff Project

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