Comic 1738 - Son of Mr. & Mrs. Rockhound 92

2nd Mar 2018, 12:00 AM
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Son of Mr. & Mrs. Rockhound 92
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KAM 2nd Mar 2018, 12:00 AM edit delete
KAM
As a general rule of thumb that's accurate. All three are silicon dioxides, but then so are opals, obsidians, and quartzes, but they have other visual differences.

Technically agate should have a cryptocrystalline structure, but that's a more recent discovery and back in the old days some people would call a stone an agate, because agates sold better than jaspers.