Identification of Igneous Rock
You have identified Obsidian.
Obsidian can come is wide range of color index but most often is found on the maffic end of the spectrum.
Texture |
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Felsic |
Intermediate |
Mafic |
Ultramafic |
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Pegmatitic |
Granite-pegmatite |
Diorite-pegmatite |
Gabbro-pegmatite |
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Phaneritic |
Granite |
Diorite |
Gabbro |
Rarely seen (Komatiite) |
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Aphanitic |
Rhyolite |
Andesite |
Basalt |
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Porphyritic |
Porphyritic Rhyolite |
Porphyritic Andesite |
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Glassy |
Obsidian |
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Vesicular |
Pumice |
Scoria |
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Pyroclastic |
Tuff |
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