Composition: Pb2Fe3+2Si2O9
Crystal System : Orthorhombic
Colours: Greyish-black, greenish-black, black
Lustre : Metallic, greasy
Hardness (H) : 6
Specific Gravity (S.G) : 5.73
References: Gebhard (1999)


Very rare. Second oxidation zone.


  • Supergene
  • 2nd Oxidation Zone

Notable Finds

Melanotekite was an accessory mineral associated with the major second oxidation zone find of alamosite in the mid-1970s.

Paragenetic and General Notes

Melanotekite occurs mainly as small spherules (to c. 1 mm) on anglesite or on / with other lead silicate minerals (notably alamosite).

Extremely rarely, it occurs as crystals of c. 1 mm on leadhillite.