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25 carat Country of origin: Brazil Gemological information about aquamarine: Possible colors: Light blue to dark blue
56g Carat weight: 142
79 caratPays d'origine: CongoInformations gemmologiques sur la malachite:Couleur possible: Vert clair à vert foncé avec zonationDensité: Entre 3
27mm Weight in grams: 8
673 Birefringence: Most of the time it is zero Chelsea Filter: Inert Spectrum: Not observable / not diagnostic Different countries where black jade may be mined: Japan
Préhnite 32 Losange 25 carat Country of origin:Prehnite cabochon with some episode inclusions. Color: Green and some black Shape: Oval Size: 36. 88 x 22. 25mm Weight in grams: 9. 47g Carat weight: 47. 38 carat Country of origin: Mali Gemological information about prehnite: Possible colors: Colorless, white, green, yellow, brown Density: between 2. 80 and 2. 95 Hardness: between 6 and 6. 5 Crystal system: Orthorhombic Breakage: Irregular Cleavage: Distinct Polariscope: Anisotropic Refractive index:
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