Home > Sterling Hill – May 29 > MS0937 Fluoborite

Fluoborite - Sold

Fluoborite is a magnesium borate fluoride, originally found in Sweden and named for its composition (Geijer, 1926). Bauer & Berman (1929) noted the mineral at Sterling Hill. In this example fluoborite forms fibrous tufts to 1.6 cm across on an etched matrix. It appears that calcite was removed from the specimen naturally, as Trimingham suggests this piece is hydorthermal. There is minor recrystalized rhodochrosite, which contrasts well with the franklinite matrix. Interesting specimen with much relief.

This specimen comes from the Bob Trimingham collection, a collector from Livermore, California. His detailed collection card indicates purchase from Minerals Unlimited (Ralph Merrill) in 1976.