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Volcanic Glass 

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Obsidian volcanic glass WikiVolcanic glass occcurs where magma cools so rapidly that crystals are unable to form. Like normal glass it is halfway between a solid and a gas but not a liquid fluid. It will shatter,break, have conchoidal fracture and produce sharp edges.

    Obsidian is a rhyolitic glass which appears black, formed when rhyolitic lava cools rapidly
    Pumice is considered glass as it has no crystal structure
    Peles hair : thin strands of glass
    Peles tears droplet of glass
    Polagonite basalitc glass with a low silica content.
Violent volcanic explosions can produce large volumes of ash which will include very fine volcanic glass.