Synonyms:  Black Moonstone, Carnatite, Labrador Felspar, Labrador Moonstone, Mauilite, Opaline Feldspar, Radauite, Silicite
Variety of:  Anorthite
Classification:  Silicates, Tektosilicates, Feldspar Group
Chemical formula: (Ca,Na)[Al(Al,Si)Si2O8]
Crystal system:  triclinic
Density (g/cm3):  2,8 measured
Cleavage:  Perfect on (001), distinct on (010)
Fracture:  Uneven to conchoidal
Hardness (Mohs):  6-6,5
Colour:  Pale green, blue, colourless, grey-white
Lustre:  Sub-Vitreous, dull
Streak:  White
Type locality:  Ford Harbour, Paul Island, Labrador, Newfoundland and Labrador, Canada
Application:  Gemstone, Ornamental stone,