Mineral Information and Data:

Aurorite
(Mn2+,Ag,Ca)Mn4+3O7 • 3H2O [CNMNC approved formula]

Named for the locality : Aurora mine, Treasure Hill, Hamilton, Nevada, USA.

IMA status : Approved Species 1967 (IMA1966-031)
CLASSIFICATION 
Dana
(8th edition) :
07.08.02.02  
  (07) Multiple Oxides
  (07.08) where A B (O)2 · x(H2O)
  (07.08.02) Chalcophanite Group
  
Nickel-Strunz
(10th edition) :
04.FL.20
  (04) Oxides and Hydroxides
  (04.F) Hydroxides (without V or U)
  (04.FL) Hydroxides with H2O +- (OH); sheets of edge-sharing octahedra
  
Crystal system: Trigonal System
Point group (H-M): 3 — rhombohedral
Unit cell: a = 7.514Å, c = 20.734Å
Crystal Habit: As small, irregular masses and platy or scaly grains, to 8 μm.
  
Color: Black; pale brown in transmitted light at the edges of very thin, platy grains.
Diaphaneity: Opaque
Hardness (Mohs): 2 - 3
  
Geologic Setting: In veinlets filling microfractures in manganoan calcite (Aurora mine, Nevada,
USA).
Mineral Association: Manganoan calcite, argentian todorokite, cryptomelane, pyrolusite, chlorargyrite, silver, quartz (Aurora mine, Nevada, USA).
  

<<< BACK TO MINERAL SEARCH