Pumpelleyite

specimen number:
2062380

location:
Houghton Co., Michigan, USA

description:
An open pocket lined with green botryoidal pumpellyite, the variety often called chlorastrolite. Condition. Collected around 1970.

Chlorastrolite is a variety of the mineral pumpellyite, commonly known as the Isle Royale greenstone or Michigan's state gemstone. It typically forms within the vesicles of ancient basaltic lava flows and is famous for its distinct green color and unique starburst or turtleback mosaic pattern caused by radiating fibrous crystals. Because of its attractive chatoyancy and rarity, small polished pieces are frequently collected and used in jewelry, though large specimens remain exceptionally scarce.

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