Mineral Information and Data:

Anduoite
RuAs2 [CNMNC approved formula]

Named for the locality: Anduo Cr deposit, Amdo (Anduo) Co., Nagchu (Naqu) Prefecture, Tibet Autonomous Region, China.

IMA status : Approved Species 1979 ()
CLASSIFICATION 
Dana
(8th edition) :
02.12.02.08  
  (02) Sulfides - Including Selenides and Tellurides
  (02.12) where Am Bn Xp, with (m+n):p=1:2
  (02.12.02) Marcasite Group (Orthorhombic: Pnnm)
  
Nickel-Strunz
(10th edition) :
02.EB.15a
  (02) Sulfides
  (02.E) Metal Sulfides, M:S = 1:2
  (02.EB) M:S = 1:2, with Fe, Co, Ni, PGE, etc.
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
Crystal Habit: Massive grains
  
Color: Pinkish-white
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): 6.5 - 7
Measured Density: 8.692 (calculated) g/cm3
Cleavage: Distinct/Good One direction observed
Tenacity: Brittle
Streak: Grayish black
  
Polymorphism and Series: Forms a series with Omeiite
Geologic Setting: Of magmatic origin, as very rare inclusions in chromian spinel in chromitite bodies enclosed variously by augite peridotite, serpentinized dunite, harzburgite, and pyroxenite.
Mineral Association: Chromian spinel, pyrite, pyrrhotite, marcasite, magnetite, chalcopyrite, molybdenite, galena, millerite, violarite. Other platinum group minerals present are ruthenarsenite, sperrylite, ruthenian iridarsenite, irarsenite, irarsite, osarsite, osmiridium, ruthenian osmiridium, laurite, rutheniridosmine (Anduo, Tibet, China); chromian spinel, sperrylite, hollingworthite (Maja e Sukes deposit, Albania).
  

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