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except in the optical axis) Refractive index: n0: 1
Système cristallin: Trigonal / Microcristallin
Chelsea filter: Variable depending on color
Possible color: Blue-mauve
VENDU Ammonite noire 5 Chips except in the optical axis)Ammonite cabochon. Color: Black Shape: Oval Size: 53. 22 x 37. 97mm Weight in grams: 18. 15g Carat weight: 90. 74 carat Country of origin: India Gemological information about ammonite: Density: Between 2. 80 and 2. 95 Hardness: 4 Crystal system: Orthorhombic Cleavage: In many directions Polariscope: Anisotropic. Generally opaque, does not restore because unobservable. Spectrum: Indistinct
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