Tuesday 28 May 2019

Prehnite

Prehnite gemstones are usually light green in color, with a whitish hue or yellowish tinge. Deep green gemstones are not common. Prehnite gemstones often appear cloudy or velvety, and rarely fully transparent. They may also contain colors zones of lighter and darker green.


Chemical FormulaCa2Al2Si3O12(OH)
ColorGreen
Hardness6Â -Â 6.5
Crystal SystemOrthorhombic
Refractive Index1.61Â -Â 1.64
SG2.8Â -Â 3.0
TransparencyTranslucent
Double Refraction.030
LusterVitreous, waxy
Cleavage1,1;3,1
Mineral ClassPrehnite
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