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

/ flŏg′ə-pīt′ /

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.

From Project Gutenberg

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.

From Project Gutenberg

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

From Project Gutenberg