General Information:
Chemical Formula:CaFe++2Fe+++Si2O7O(OH)
Composition:(Molecular Weight = 408.79 gm)Calcium 9.80 %
CaIron 40.98 %
FeSilicon 13.74 %
SiHydrogen 0.25 %
H Oxygen 35.22 %
O Empirical Formula: CaFe2+3(SiO4)2(OH)
Environment:Occurs with magnetite ore bodies, with zinc and copper ores, and in contact deposits and zeolites.
Locality:Capo Calamita, on Elba.
Name Origin:Named ilvaite from the Latin name of the island of Elba.
Physical Properties: Cleavage:[010] Distinct, [001] Distinct
Color:iron black or dark grayish black.
Density:3.99 - 4.05, Average = 4.01
Diaphaniety:Opaque
Habits:Striated - Parallel lines on crystal surface or cleavage face., Columnar - Forms columns, Massive - Uniformly indistinguishable crystals forming large masses.
Hardness:5.5-6 - Knife Blade-Orthoclase
Luminescence:None.
Luster:Sub Metallic
Streak:brownish black
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