phonolite

phonolite

The extrusive equivalent of nepheline syenite. The principal mineral is soda orthoclase or sanidine. Other major minerals are nepheline and aegirine diopside, usually with other feldspathoidal minerals such as sodalite or haueyne. Accessories include apatite and sphene. Phonolite is an important ore progenitor, as at Cripple Creek, CO. Syn: clinkstone
Source: Dictionary of Mining, Mineral, and Related Terms

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