Snowflake obsidian
| Refractive Index : 1.490 (+0.020 – 0.010) |
| Optical Characteristic : SR, ADR |
| Specific Gravity : 2.40 (+0.10 – 0.07) |
| Formula : Mostly silica. |
| Crystal System : Non-crystalline |
| Variety/Species : obsidian |
| Species/Group : glass-natural |
| Birefringence : none |
| Dispersion : N/A |
| Hardness : 5 to 5.5 |
| Toughness : Fair to good |
| Ultrasonic : Usually safe |
| Steam : risky |
| UV Long : Inert |
| UV Short : Inert |
| Pleochroism : None |
| Strength : N/A |
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| Pleochroism Colors : None |
| Heat : May fracture |
| Acids : Avoid hydrofluoric acid |
| Light : stable |
| Polish Luster : vitreous |
| Fracture : conchoidal |
| Fracture Luster : Vitreous |
| Clarity Type : N/A |
| Tones : N/A |
| Saturations : N/A |
| Cause of Color : variable causes |
| Enhancements : none |
| Cleavage : None |
| Color Range : Gray, Black Spotted with white patches. Grayish, blackish |
| Transparency : Transparent to opaque |
| Phenomena : lridescence, chatoyancy, (rare), aventurescence |
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| Separations : Snowflake obsidian from- Moldavite : SG(possibly), appearance, magnification, transparency(possibly) Libyan Desert glass : color/appearance, SG(possibly) Opal : Appearance, magnification, RI (possibly), SG (possibly) Chalcedony : RI, SG, appearance, magnification, fracture luster, polariscope reaction (possibly) Manmade glass : Appearance, magnification, RI(possibly) SG (possibly) |
| Identifying Characteristics and information Black or dark gray background with white patches. The white patches are cristobalite. Gas bubbles and flow lines appear in both obsidian and man-made glass. |
| Spectral Data not diagnostic. |
| Trade Names and Misnomers Flowering Obsidian Snowflack Obsidian |
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