natural glass


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natural glass

[′nach·rəl ′glas]
(geology)
An amorphous, vitreous inorganic material that has solidified from magma too quickly to crystallize.
References in periodicals archive ?
Ancient thermometers The layer of material that formed with age on the surfaces of ancient artifacts made of natural glass revealed the temperatures that the artifacts had experienced (170:110).
In fact, we could say that glassmaking first started, almost from the beginning of time, with the formation of obsidian, a natural glass.
Specifically, the line includes Nature's Source Natural Glass & Surface Cleaner by Windex, Nature's Source Natural All-Purpose Cleaner by Scrubbing Bubbles, Nature's Source Natural Bathroom Cleaner by Scrubbing Bubbles and Nature's Source Natural Toilet Bowl Cleaner by Scrubbing Bubbles.
Green Works[TM] Natural Glass & Surface Cleaner