Home > Copper Minerals – January 21 > MS1490 Azurite crinoid

Azurite crinoid

Azurite is a well known mineral, named for its azure color. Chemically, azurite is a hydrous copper carbonate. While known since antiquity, it was French mineralogist F. S. Beudant (1787-1850) who first applied the currently accepted name, azurite, to this mineral species in his 1832 Traité Élémentaire de Minéralogie.

In Arizona, very large igneous intrusions deposit copper by replacing rocks, including limestone. Limestone often carries fossils, which occasionally remain preserved throughout the ore formation process. Here a crinoid stem, 4 mm in diameter, faithfully preserved in blue azurite. Crinoid fossils are common in the Longfellow limestone, which formed in a shallow inland sea between 488 and 443 million years ago (Ordivician). This specimen was formerly in both the Barbara Muntyan and Chris Cowan collections.

Price: $125

Item code: MS1490

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