Howlite ↗
Mineral species
Howlite is often encountered as white beads with gray markings. In its natural nodular form it can look very different from the smooth surface of a polished bracelet.
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Crystal Guide / All families
Editorial material shelf
Borates & silicoborates.
Boron-rich mineral species, kept distinct from the silicate shelf.
Keep each chapter’s scientific identity: a family, species, variety, trade label, rock and fossil are different kinds of names.