Mineral Information and Data:

Modderite
CoAs [CNMNC approved formula]

Named for the locality : Modderfontein mine, Witwatersrand, Transvaal, South Africa.

IMA status : Valid species (Pre-IMA 1924) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
02.08.18.01  
  (02) Sulfides - Including Selenides and Tellurides
  (02.08) where Am Bn Xp, with (m+n):p=1:1
  (02.08.18)
  
Nickel-Strunz
(10th edition) :
02.CC.15
  (02) Sulfides
  (02.C) Metal Sulfides, M:S = 1:1 (and similar)
  (02.CC) With Zn, Fe, Cu, Ag, etc.
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  

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