Opals, as hydrated forms of silica, encompass a wide range of materials formed by both biogenic and diagenetic processes. The genesis of opal involves precipitation from silica‐rich fluids and ...
No. 10 of an untitled series (published by Lithographie, LLC, formerly Lapis International) which used to be called extraLapis English. Translation of: Opal, das edelste Feuer des Mineralreichs.
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