Pyrope

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pyrope

[′pī‚rōp]
(mineralogy)
Mg3 Al2(SiO4)3 A mineral species of the garnet group characterized by a deep fiery-red color and occurring in basic and ultrabasic igneous rocks.

Pyrope

 

a mineral of the garnet group; in pure form, magnesium aluminum garnet Mg3Al2[SiO4]3, containing 20.45 percent MgO and frequent admixtures of Fe, Mn, and other elements. Known for its rich, attractive dark red color, pyrope is a characteristic component of certain peridotites, kimberlites, and serpentinites. Transparent blood-red varieties of pyrope are classed as gems. The most well-known pyropes are from the Czechoslovak Socialist Republic, where they occur in basalt breccia detritus, embedded in peridotites, and are extracted from placers. In the USSR, pyrope occurs in the kimberlites (where pyrope is associated with diamond) and eclogites of the Yakutia.

References in periodicals archive ?
From 2004, we have many samples that have returned significant proportions of, G10 and G10D pyrope garnets which so far, have not been evidenced in abundance from the known bodies (see pyrope plot below).
Micro-probe analysis performed thus far on kimberlite indicator minerals recovered from samples collected in 2004 has confirmed the presence of diamond inclusion (DI) chemistry with the identification of high chrome G10 pyrope garnets.
Micro-probe analyses has confirmed the presence of kimberlite indicator minerals recovered from the Barrow Project some of which have Diamond Inclusion (DI) chemistry, including several high chrome G10 pyrope garnets.
Several samples yielded pyrope garnets with kelyphite rims and one sample yielded a pyrope garnet with a kimberlite mantle, indicating a close proximity to source.
After drilling through loose sand and a thick section of silcrete (Kalahari formation), numerous coarse kimberlitic ilmenites and pyrope garnets of up to 5 mm in size were visually identified in weathered kimberlite from 34 meters depth.
Pyrope garnets recovered to date from within the Tremblay Corridor consist of 40% G9A or G10A garnets, implying derivation from within the diamond stability window.