mimetite

mimetite

[mim-i-tahyt, mahy-mi-]
noun
a mineral, lead chloroarsenate, Pb 5 As 3 O 1 2 Cl, occurring in yellow to brown prismatic crystals or globular masses: a minor ore of lead.

Origin:
1850–55; < Greek mīmēt(ḗs) imitator (equivalent to mīmē- (see mimesis) + -tēs agent suffix) + -ite1

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mimetite (ˈmɪmɪˌtaɪt, ˈmaɪmɪ-)
 
n
a rare secondary mineral consisting of a chloride and arsenate of lead in the form of white or yellowish needle-like hexagonal crystals. Formula: Pb5Cl(AsO4)3
 
[C19: from German, from Greek mimētēs imitator (of pyromorphite)]

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mimetite

arsenate mineral, lead chloride arsenate [Pb5(AsO4)3Cl], in the pyromorphite series of the apatite group of phosphates. Its colour ranges from brown to olive green, yellow, or orange. It greatly resembles pyromorphite (q.v.), in which phosphorus replaces arsenic in the crystal structure; mimetite is similar in physical characteristics and mode of occurrence (barrel-shaped crystals or rounded masses) but is less common. Mimetite also forms a continuous solid-solution series with vanadinite in which vanadium replaces mimetite's arsenic in the crystal structure. Campylite is any member of the pyromorphite-mimetite series distinguished by distorted crystals with curved faces. For detailed physical properties, see arsenate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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