General Information:
Chemical Formula:Ca2(Y,Ce)2Si4O12(CO3)·(H2O)
IMA Status:Approved IMA 1987
Locality:Island of Hiero, Vest-Agder, Norway.
Physical Properties: Cleavage:[???] Good
Color:brown, colorless, green yellow, yellow, or light yellow brown.
Density:3.4 - 3.6, Average = 3.5
Diaphaniety:Transparent to translucent
Habits:Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., ,
Hardness:5-6 - Between Apatite and Orthoclase
Luminescence:Non-fluorescent.
Luster:Vitreous (Glassy)
Streak:white
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