Tags: silicon dioxide
V is for Verde Antique This green beauty gob-smacks our favorite geologist. By Bill Langer Verd-antique, (verd-an-teek) — etym., viridis (vir’-e-dis), green, and antiquus (an-ti’-qwus), ancient (noun) — ‘Serpentine … of a tint resembling that of the green incrustation on ancient coins.’ From ...
O is for obsidian Although a relative youngster in geologic terms, obsidian can change over time from glass to mineral. By Bill Langer Obsidian (ŏb-sĭd’-ē-ən) noun – a usually black or banded, hard volcanic glass formed by rapid cooling of lava that displays ...
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