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5 et 7Système cristallin: Trigonal / microscristallinCassure: Subconchoïdale
Taille: 10-20mm
Les couleurs sont liées à la présente d'inclusions de limonite ou de goethite
52mm de diamètre
Préhnite 15 unakite 5 et 7Système cristallin: TrigonalPrehnite cabochon with some episode inclusions. Color: Green and some black Shape: Square Size: 21. 79 x 21. 11mm Weight in grams: 7. 52g Carat weight: 37. 60 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
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