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harmotome
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Harmotome from Strontian, Scot.
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Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.
(Bed) Rocks and (Flint) Stones
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zeolite
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Harmotome from Strontian, Scot.
Harmotome from Strontian, Scot.

harmotome

mineral
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History

harmotome, hydrated barium aluminosilicate mineral, (Ba,Na,K)1–2 (Si,Al)8O16 βˆ™ 6H2O, in the zeolite family. Harmotome is isostructural with the mineral phillipsite; that is, the three-dimensional structure of the aluminosilicate framework is the same in the two substances. Its glassy, crosslike twinned crystals vary in colour from white to gray, yellow, red, and brown. It is ordinarily found with chabazite in basalts, as in Bodenmais, Germany; Kongsberg, Norway; and western Scotland. For detailed physical properties, see zeolite (table).

This article was most recently revised and updated by John P. Rafferty.