Malachite
| Refractive Index : 1.909 – 1.655 |
| Optical Characteristic : AGG |
| Specific Gravity : 3.95 (+0.15 – 0.70) |
| Formula : CuCO3(OH)2 |
| Crystal System : Monoclinic |
| Variety/Species : All |
| Species/Group : Malachite |
| Birefringence : 0.254 |
| Dispersion : N/A |
| Hardness : 3.5 to 4 |
| Toughness : poor |
| Ultrasonic : Never |
| Steam : Never |
| UV Long : Inert |
| UV Short : Inert |
| Pleochroism : None |
| Strength : N/A |
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| Pleochroism Colors : None |
| Heat : sensitive |
| Acids : Attacked by acids and/or chemicals |
| Light : Stable |
| Polish Luster : Silky to vitreous |
| Fracture : Uneven to splintery |
| Fracture Luster : Dull |
| Clarity Type : N/A |
| Tones : N/A |
| Saturations : N/A |
| Cause of Color : Copper |
| Enhancements : Impregnation |
| Cleavage : perfect in 1 direction. |
| Color Range : Vivid, slightly bluish green, banded in 2 tones (or more) of green; sometimes has a sheen. |
| Transparency : Opaque |
| Phenomena : Chatoyancy |
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| Separations : malachite from- Dyed onyx marble: RI, SG Synthetic malachite (Russian): Generally can’t be separated from natural with standard gemological tests. |
| Identifying Characteristics and information Curved banding sometimes forming “eyes.” Sometimes botryoidal. Has a light green streak. May have sheen. Avoid rough handling, heat, and chemicals. |
| Spectral Data Not diagnostic. |
| Trade Names and Misnomers Natural Malachite Peacock Stone Pseudo-Emerald (M) Silver Peak jade (M) |
Tags: malachite, Monoclinic, Peacock Stone, Pseudo-Emerald, Silver Peak jade
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