General Information:
Chemical Formula:
CaY2Be2Si2O10
Composition:
(Molecular Weight = 452.08 gm)
Calcium 8.87 % Ca
Yttrium 39.33 % Y
Beryllium 3.99 % Be
Silicon 12.43 % Si
Oxygen 35.39 % O
Empirical Formula:
CaY2Be2(Si2O10)
Environment:
Granitic pegmatites.
IMA Status:
Approved IMA 1986
Locality:
The Jaguaracu Pegmatite, Minas Gerais, Brazil. Also known as the Jose Miranda mine or the Ze Pinto or Jose Pinto mine.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[001] Perfect
Color:
violet, lilac, or purple.
Density:
4.25
Diaphaniety:
Translucent
Habits:
Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat., Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.,
Hardness:
6-7 - Orthoclase-Quartz
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Dull
Streak:
pale purple white
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