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Hyalite in Hyalite Canyon

Near Bozeman Montana, Hyalite, a form of opal with a clear glassy appearance covers broken talus and rocks and sparkles like a gem in the afternoon light. I observed sections one-meter square that looked like bubbles of melted glass, poured over broken rock.

Greek for "glass stone", Hyalite is generally considered the purest and clearest Opal variety; A cut gem can have the appearance of clear cut glass. Hyalite is also called Muller's glass, jalite, and water opal.

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