Mineral Information and Data:

Billingsleyite
Ag7AsS6 [CNMNC approved formula]

Named for Paul Billingsley (1887-1962), mining geologist, who discovered the North Lily mine, and collected the type material.

IMA status : Approved Species 1968 ()
CLASSIFICATION 
Dana
(8th edition) :
03.01.06.01  
  (03) Sulfides - Sulfosalts
  (03.01) where z/y > 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.01.06)
  
Nickel-Strunz
(10th edition) :
02.KB.05
  (02) Sulfides
  (02.K) Sulfarsenates, Sulfantimonates
  (02.KB) Sulfarsenates with additional S
  
Crystal system: Orthorhombic System
Point group (H-M): 222 — disphenoidal
  
  
  

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