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Obsidian
Type: Volcanic Glass (Amorphous)
Chemical Formula: SiO₂ with iron and magnesium
Hardness: ~5 – 5.5 on the Mohs scale
Color: Most commonly black, but also found in rainbow, snowflake, mahogany, gold, and silver varieties.
Element: Water (水)
Type: Volcanic Glass (Amorphous)
Chemical Formula: SiO₂ with iron and magnesium
Hardness: ~5 – 5.5 on the Mohs scale
Color: Most commonly black, but also found in rainbow, snowflake, mahogany, gold, and silver varieties.
Element: Water (水)…
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