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Aerugite

• 
  Johanngeorgenstadt, Johanngeorgenstadt District, Erzgebirge, Saxony, Germany
  © Rob Lavinsky

• Formula:
  Ni_8.5(AsO₄)₂As⁵⁺O₈

• System: Monoclinic

• Name:
  Named by Gilbert-Joseph Adam in 1869 from 'aerugo', which means 'copper rust', alluding to its appearance.

• IMA Status: Valid (Approved)

• Type Locality:
  Johanngeorgenstadt, Johanngeorgenstadt District, Erzgebirge, Saxony, Germany

• Dana 8th: 41.3.11.
  
  41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
  3 : (AB)₃(XO₄)Z_q

• Hardness (Mohs): 4

• Density: 5.85 g/cm³ (measured)
  5.772 g/cm³ (calculated)

• Lustre: Sub-Adamantine,Sub-Vitreous,Resinous

• Diapheny: Transparent

• Diapheny: brittle

• Colour: Dark grass-green, blue-green, pale brown.

• Streak: Pale green, pale blue-green.