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A Geoscience Digital Image Library

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TitleBronzite (orthopyroxene) from the Stillwater complex, Montana USA
DescriptionCommon orthopyroxene is mostly a solution of two end members: enstatite (MgSiO3) and ferrosilite (FeSiO3). Bronzite is a type of Mg-rich orthopyroxene containing 10-30% ferrosilite. Orthopyroxenes containing greater amounts of ferrosilite are termed hypersthene. Sometimes weathering gives bronzite a bronze tarnish; thus the name. This sample, about 9 cm across, is from an orthopyroxene rich layer in the Stillwater Complex, a Precambrian igneous complex in Montana.
LocationUSA ▹ Montana. Near Nye. Stillwater Complex.
PhotographerShannon Heinle. 2001-04-24.
CollectionUniversity of North Dakota Mineralogy Collection #6.
Key wordsbronzite, Montana
Tech details1011 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number406