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Bornhardtite

• Formula:
  Co²⁺Co³⁺₂Se₄

• System: Isometric

• Name:
  For Dr. Wilhelm Bornhardt (1864-?), German

• IMA Status: Valid (Grandfathered)

• Type Locality:
  Trogtal Quarries, Lautenthal, Harz, Lower Saxony, Germany

• Dana 8th: 2.10.1.5
  
  2 : SULFIDES
  10 : A_mB_nX_p, with (m+n):p = 3:4

• Hardness (Mohs): 4

• Density: 6.166 g/cm³ (calculated)

• Diapheny: Opaque

• Colour: Rose-red