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Ilvaite

- Formula
- CaFe2+2Fe3+OSi2O7(OH)
- Crystal System
- Orthorhombic
- Crystal Habit
- Striated, Columnar, Massive
- Cleavage
- Distinct, Distinct, None
- Luster
- Sub Metallic
- Color
- iron black, dark grayish black
- Streak
- brownish black
- Class
- Orthorhombic - Dipyramidal
- Fracture
- Uneven
- Hardness
- 5.5-6
- WebMineral
- View Ilvaite
- Mindat
- View Ilvaite
Ilvaite from South Mountain dist., Owyhee Co., Idaho, United States

Tiny black crystals of Ilvaite with 4mm Siderite rhombs.
Click thumbnail images for larger view.