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Dureté: Entre 4
sodocalcique ou potassique
Namely: Red jasper a trade name for a rock known as "chert" (English)
Treatments that exist to modify howlite:
- White chalcedony
VENDU Améthyste trapiche en tranche 7 lapis-lazuli Dureté: Entre 4Slice of trapiche amethyst. Color: Purple Size: 56. 45 x 42. 90mm Weight in grams: 18. 29g Carat weight: 91. 43 carat Country of origin: India Gemological information about amethyst: Possible color: Blue mauve, purple, dark magenta, purple magenta Density: 2. 65 Hardness: 7 Crystal system: Trigonal Fracture: Conchoidal Cleavage: None Polariscope: Anisotropic (restores all 90, except in the optical axis) Refractive index: n0: 1. 538 to 1. 544 ne: 1.
