phlogopite

[flog-uh-pahyt]

noun

1. a magnesium-rich mica mineral, usually yellowish-brown, but sometimes reddish-brown.

phlogopite

/ ˈflɒɡəˌpaɪt /

noun

1. a brownish mica consisting of a hydrous silicate of potassium, magnesium, and aluminium, occurring principally in metamorphic limestones and ultrabasic rocks. Formula: KMg 3 AlSi 3 O 10 (OH) 2 See also mica

phlogopite

1. A yellow to dark-brown mica. Phlogopite is monoclinic and is usually found in limestone. It is used in insulation. Chemical formula: K(Mg,Fe) ₃ AlSi ₃ O ₁₀ (OH) ₂.

Word History and Origins

Origin of phlogopite¹

1840–50; < Greek phlogōp ( ós ) fiery-looking ( phlog-, stem of phlóx flame + ōp ( ḗ ) view, look + -os adj. suffix) + -ite ¹

Word History and Origins

Origin of phlogopite¹

C19: from Greek phlogōpos of fiery appearance, from phlox flame + ōps eye

Example Sentences

The magnesia-micas are now referred to the species biotite and phlogopite, which differ in that the former contains a considerable but widely varying amount of iron.

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Closely allied to the chlorites is another group of micaceous minerals known as the vermiculites, which have resulted by the alteration of the micas, particularly biotite and phlogopite.

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Other rock-forming minerals are the large family of micas, with names like muscovite and phlogopite.

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