PYROPHYLLITE Definition & Meaning

pyrophyllite

[ pahy-ruh-fil-ahyt, pahy-rof-uh-lahyt ]

Phonetic (Standard)IPA

noun

Mineralogy. a phyllosilicate, AlSi 2 O 5 (OH), usually having a white or greenish color, and occurring in either foliated or compact masses, the latter variety being used like soapstone.

pyrophyllite

/ ˌ�貹ɪ��əʊˈ��ɪ��ɪ�� /

noun

a white, silvery, or green micaceous mineral that consists of hydrated aluminium silicate in monoclinic crystalline form and occurs in metamorphic rocks. Formula: Al 2 Si 4 O 10 (OH) 2

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�y��vlog History and Origins

Origin of pyrophyllite¹

First recorded in 1820–30, pyrophyllite is from the German word Pyrophyllit; so called because it exfoliates when heated. See pyro-, -phyll, -ite ¹

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Example Sentences

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Pyrite, 100, 107-109, 307, 386, 397 Pyrophyllite, 299 Quartz, as geologic thermometer, 38 geologic occurrence, 16, 38-39, 43, 45, 47, 168-169, 196 production and use, 84, 267, 269 Quartzite, 84, 91 Quebec, Canada, asbestos, 270-272 magnesite, 193 mica, 286 Quebec, laws relating to ownership of mineral resources, 344 Queensland, Australia, arsenic, 250 Quicksilver ores.

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The following minerals, according to Griffin, produce beads with soda, but do not fuse when heated alone: quartz, agalmatolyte, dioptase, hisingerite, sideroschilosite, leucite, rutile, pyrophyllite, wolckonskoite.

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