Pezzottaite
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"Raspberyl" redirects here. For the Disgaea 3 character, see Disgaea 3 § Raspberyl.
Pezzottaite, marketed under the name raspberyl or raspberry beryl, is a mineral species first recognized by the International Mineralogical Association in September 2003. Pezzottaite is a caesium analogue of beryl, a silicate of caesium, beryllium, lithium and aluminium, with the chemical formula Cs(Be2Li)Al2Si6O18. Named after Italian geologist and mineralogist Federico Pezzotta, pezzottaite was first thought to be either red beryl or a new variety of beryl ("caesium beryl"); unlike actual beryl, however, pezzottaite contains lithium and crystallizes in the trigonal crystal system rather than the hexagonal system.
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Quick Facts General, Category ...
Pezzottaite | |
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General | |
Category | Cyclosilicate minerals |
Formula (repeating unit) | Cs(Be2Li)Al2Si6O18 |
IMA symbol | Pez[1] |
Crystal system | Trigonal |
Crystal class | Ditrigonal pyramidal (3m) (same H-M symbol) |
Space group | R3c |
Identification | |
Color | Raspberry red, orange-red, pink |
Crystal habit | flattened, tabular, equant, aggregate |
Cleavage | Imperfect; basal |
Fracture | Conchoidal to uneven |
Tenacity | brittle |
Mohs scale hardness | 8 |
Luster | Vitreous |
Streak | White |
Specific gravity | 3.10 |
Optical properties | uniaxial |
Refractive index | 1.601 to 1.620 |
Birefringence | −0.008 to 0.011 |
Pleochroism | Moderate dichroic |
References | [2][3][4] |
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