Rare Gas Isotope Contents in Mineral Fractions of the Indarch Meteorite

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We have measured the rare gas isotopes in mineral concentrates of the Indarch meteorite. We obtained samples from C. Frondel, who crushed some of the meteorite into small particles mainly in the 44 to 88 micron size. He fractionated the minerals into groups according to specific gravity, using heavy liquids and magnetic techniques. The fraction with specific gravity less than 2.4 is approximately 95% tridymite and represents about 1% of the whole stone. The fraction with specific gravity between 2.4 and 2.8 contains calcium sulfide, calcium phosphate, two unidentified minerals, and tridymite and enstatite impurities. This fraction represents a few … continued below

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Fireman, E. L. October 15, 1963.

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We have measured the rare gas isotopes in mineral concentrates of the Indarch meteorite. We obtained samples from C. Frondel, who crushed some of the meteorite into small particles mainly in the 44 to 88 micron size. He fractionated the minerals into groups according to specific gravity, using heavy liquids and magnetic techniques. The fraction with specific gravity less than 2.4 is approximately 95% tridymite and represents about 1% of the whole stone. The fraction with specific gravity between 2.4 and 2.8 contains calcium sulfide, calcium phosphate, two unidentified minerals, and tridymite and enstatite impurities. This fraction represents a few percent of the meteorite. The fraction with specific gravity between 2.8 and 3.3 consists largely of clinoenstatite and represents about 75% of the meteorite. The troilite is concentrated in the fraction with specific gravity greater than 3.3, and kamacite is concentrated in the magnetic fraction.

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  • October 15, 1963

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  • Feb. 5, 2022, 9:58 a.m.

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Fireman, E. L. Rare Gas Isotope Contents in Mineral Fractions of the Indarch Meteorite, report, October 15, 1963; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc1255895/: accessed July 18, 2025), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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