Tags: silicon dioxide
Carved in Stone
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 ... Read More...
Carved in Stone
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 ... Read More...
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