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单词 Foidolite
释义

Foidolite

英语百科

Foidolite

Foidolite (sodalitolite variety) from Namibia
Thin section of foidolite under polarizing microscope. In the foreground there is a large yellow sodium pyroxene grain surrounded by fine grains.

Foidolite /ˈfɔɪdəlt/ is a rare coarse-grained intrusive igneous rock with a feldspathoid mineral content greater than 60%. Crystals of alkali feldspar, plagioclase, biotite, amphibole, pyroxene, and/or olivine may be present within the rock. The volcanic equivalents are termed foidite and phonolitic or tephritic foidites.

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更新时间:2025/6/19 2:27:04