Century Dictionary and Cyclopedia
- n. In petrography, a variety of porphyritic granite, composed of flesh-colored orthoclase, with some oligoclase, smoky quartz, and a little biotite and hornblende. It has large phenocrysts of feldspar, often with circular zones of inclusions. It is used for monumental and building purposes in northern Russia, but falls to pieces upon weathering, hence the Finnish name.
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List of minerals, elements, group names and geochemistry terms encountered in the science of mineralogy. I've chosen to avoid capital letters in most examples, though a great many mineral names hon...
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