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Crystal Midnight Lace Obsidian

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Volcanic glass

Formula
(repeating unit)

70–75% SiO2,
plus MgO, Fe3O4

Identification

Color

Deep black or blackish green

Fracture

Conchoidal

Mohs scalehardness

5–6[1]

Luster

Vitreous

Specific gravity

~2.4[2]

Optical properties

Translucent

References

[3]

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