Chrysoprase
(kriz'-o-praz')
12th c.; lat. chrysoprasus, gr. chrysoprasos
An apple-green chalcedony used as a gemstone
Color
Semitransparent to translucent yellowish green
Family
Chalcedony - Cryptocristalline quartz
Chemical composition
SiO2
Hardness (Mohs scale)
6,5 - 7
Specific gravity
2,60 ±0,05
Refractive index
1,537 ±0,02
Optical character
None (aggregate)