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Palagonite

Gallery of Mineraloids

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Palagonite (pa-LAG-onite), named for Palagonia, Sicily, forms where glassy basalt lava freezes in the presence of steam. It can resemble a golden glass, rusty stone or anything in between.
Steamed basalt

Specimen from Lake Tahoe, California

Photo (c) 2011 Andrew Alden, licensed to About.com (fair use policy)
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