Emerald with Biotite and Graphite (illustrated)
Small Cabinet, 7.5 x 5.7 x 4.1 cm
Nova Era, Minas Gerais, Brazil
Ex. Bruno and Rolando Gioia

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This Emerald cluster is from a classic locality in Brazil, which usually produces "big blunkers" and few specimen-quality pieces for the rest of us. It is not from Colombia although sometimes they are out there on the market, mislabelled, even though its characteristic matrix is telling. This is a cluster of three major moderately intergrown crystals of dark green Emerald with crystals to 6 cm in length! They are pretty much randomly oriented with the three largest crystals converging at the top and one in almost parallel growth; and all of them are translucent to gemmy displaying a satiny to slightly glassy luster. The smaller, but just as translucent, components of this cluster on the front and back side range in length from 1.5 to 2.5 cm. All of the crystals on this piece are terminated on one end by the pinacoid form (flat top). The intersections of the crystals and portions of the prism faces on the exterior have a sparkling black patchwork of association with Biotite mica and Graphite, and some of the Emerald crystals are included by this material. Although the crystals are not quite gemmy enough to cut, they definitely qualify as translucent to transparent rather than opaque or just translucent. They have the best bright emerald green color from this locality. An excellent Emerald group from Brazil, and these specimens cost a lot less than emeralds from other countries, if you want to have a nice representative large display emerald in a collection. For this locality, the piece is remarkably aesthetic compared to others, as befits the style of these collectors. Illustrated in Mineral Collections of Brazil, 2020, page 133

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