Grape stone, a gemstone that is easily confused with jadeite, is similar to the glutinous water jade. There are often grape-like imitation high-grade jade in the market, but the crystals that can be processed into faceted gemstones are very few. Only a few high-quality people can be processed into beautiful gemstone faceted gemstones, mostly used as pendants and bracelets. So it is not difficult to distinguish. The main characteristics of mineralogy and jadeite have certain differences, mainly characterized by hardness, refractive index and hardness lower than jadeite, jadeite is interwoven fiber structure, and grape stone has radial fiber structure, and fiber constitutes spherical aggregate. The complete development of the jade cleavage usually shows the green nature, that is, the phenomenon of flies, and the grape stone does not.
Main characteristics of grapestone mineralogy
Mineral name: grape stone prehnite
Crystallization state: crystalline aggregates, often in the form of plates, flakes, grapes, kidneys, radial or massive aggregates
Common colors: white, light yellow, flesh red, green, often light green
Photographic characteristics: heterogeneous, biaxial crystal, positive light, often in aggregate
Transparency: semi-transparent, colorless transparent
Refractive index: the point is usually 1.63 birefringence: 0.020 ~ 0.035, the aggregate is unmeasurable
Mohs hardness: 6 ~ 6.5
Density: 2.80g/cm 3 ~ 2.95g/cm 3
Absorption spectrum: 438nm weak absorption band
Magnified observation: fibrous structure, radial arrangement
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