Tsumcorite

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Tsumcorite is a rare lead arsenate and this thumbnail is richly covered with orange-brown microcrystals from the name-sake Type Locality. It is a small specimen, but a very rich one with high quality microcrystals in rich covering. So, it is pretty - most are very much uglier! This showy and excellent rarity is from the Dr. Mark Feinglos Collection, a noted rare species collector.