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Locality

Butte dist., Silver Bow Co., Montana, United States

Formula

Mn₄Be₃(SiO₄)₃S

Size

Thumbnail 3x2x3cm

Helvite according to Jenkins & Lorengo (Min. Record v. 33, n. 1 2002) is a rare mineral at Butte and was found in a single specimen from the Lexington mine. This specimen contains a single lemon yellow anhedral crystal grain in Rhodonite matrix.

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Locality

Navegador mine, Conselheiro Pena, Minas Gerais, Brazil

Formula

Mn²⁺₄(BeSiO₄)₃S

Size

SmCabinet 8x6x3cm

Excellent well-formed crystals to 7mm on Albite variety cleavelandite. These came out several years ago in limited quantity.