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Sponge Quartz Beads

Sponge quartz, often dyed blue, is a whitish quartz with a marble or sponge-like effect.  John Mawe calls it also cellular quartz in his "Descriptive Catalogue of Minerals" (1764-1829).

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10x10 mm, round, gemstone beads, sponge quartz, sinbad blue

Gemstone, natural sponge quartz, sinbad blue dyed, 10x10 mm, round beads - Mohs' hardness 7.0 - one unit is +/- 19 cm and has +/- 19 beads
From €3.55