Mineralpedia Details for Johnsomervilleite
Johnsomervilleite
- Formula
- Na10Ca6Mg18Fe2+25(PO4)36
- Crystal System
- Trigonal
- Crystal Habit
- Granular, Dendritic, Colloform
- Cleavage
- Perfect, None, None
- Luster
- Vitreous (Glassy)
- Color
- dark brown, blackish gray
- Streak
- light brown
- Class
- Trigonal - Rhombohedral
- Fracture
- Brittle - Splintery
- Hardness
- 4.5
- WebMineral
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Johnsomervilleite from Sapucaia mine, Galileia, Doce valley, Minas Gerais, Brazil
A small chip with resinous black Johnsomervilleite.
Click thumbnail images for larger view.
