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  Home  >>  Mineral Encyclopedia  >>  Mineral Photos  >>  Ilvaite-Ilvaite
Ilvaite
Chemical
Formula
 Ca(Fe2+)2Fe3+[O|OH|Si2O7]
Species
 Silicates
Crystal
System
 Orthorhombic
Mohs
Scale
 5-6
Specific
Gravity
 3.8-4.1
Color
 Iron-black, dark grayish black
Streak
 black
Luster
 Sub-Metallic
Refractive
Index
 n = 1.727 n = 1.870 n = 1.883
Diaphaneity
 Opaque
Cleavage
 Distinct/GoodDistinct on
Fracture
 Irregular/Uneven
Crystal Habit：Prismatic, columnar, radiating, compact massive,
Geological Setting：Contact metasomatic rocks and iron deposits.
Ilvaite7593
Ilvaite7593

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