Nekrasovite: properties and occurrences

Nekrasovite is a rare copper vanadium sulfosalt mineral with formula Cu26V2(Sn,As,Sb)6S32. It is an isometric-hextetrahedral reddish brown mineral containing antimony, arsenic, copper, iron, sulfur, tin, vanadium, and zinc. It is a rare copper vanadium sulfosalt mineral with formula isometric system and occurs as small grains in ore aggregates.

It was first described in 1984 in the Khayragatsch ore deposit of eastern Uzbekistan and named for Russian mineralogist Ivan Yakovlevich Nekrasov (born 1929).

General Information

  • Formula: Cu26V2(Sn,As,Sb)6S32
  • Colour: Pale brown
  • Lustre: Metallic
  • Hardness: 4½
  • Crystal System: Isometric
  • Color:  Reddish brown.
Nekrasovite – a brown opaque metallic mineral

Properties

Nekrasovite is a sulfosalt mineral. It crystallizes in the isometric system and occurs as small grains in ore aggregates. It is a brown opaque metallic mineral with a Mohs hardness of 4.5 and a specific gravity of 4.62.

  • Density: 4.62
  • Diaphaneity: Opaque
  • Fracture: Brittle – Generally displayed by glasses and most non-metallic minerals.
  • Habit:  Granular – Generally occurs as anhedral to subhedral crystals in matrix.
  • Hardness: 4.5-5 – Near Apatite
  • Luster: Metallic

Occurrence:

In ore aggregates within propylitic andesites and dacites (Khayragatsch deposit, Uzbekistan).

Association: Tetrahedrite–tennantite, luzonite–famatinite, pyrite, mawsonite, chalcopyrite, emplectite, laitakarite, bismuth, calcite, quartz, barite (Khayragatsch deposit, Uzbekistan).

Information Source: