Obsidian
Freshly broken obsidian can have razor-sharp conchoidal fractures, a reminder that it is glass rather than crystalline quartz. Learn its mineral identity, hardness, care, common treatments, authenticity notes…
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Origin: <span>Iceland</span>
Mineralogy, identification, care, lapidary craft, interiors and documented cultural history—with traditional beliefs clearly labelled as a separate subject.
Calcite
Calcite often shows obvious cleavage, waxy lustre and strong colour in decorative pieces. Learn its mineral identity, hardness, care, common treatments, authenticity notes and traditional associations.
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