|RED BERYL MINERAL FACTS|
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Red Beryl Mineral Facts:
Chemical Formula: Be2Al2(SiO3)6
Colors: Red Beryl is the Raspberry red color variety of beryl, and is colored by manganese. It is an extremely rare variety of beryl. Its streak is white.
7.5 to 8.0
Density: 2.6 to 2.8
Cleavage: Beryl's cleavage is very imperfect but there is frequently a parting parallel to the base.
Luster:. Beryl has a glassy luster. It is transparent or translucent. Red Beryl describes the red form of this mineral. Used as a gem or as a collectors stone.
Optics: (Refractive Index): w= 1.5740, e= 1.5690
The other transparent
varieties of beryl are utilized as gems, under the following names:
Identification and Diagnostics
Localities and Origins:
While other varieties of gem beryl crystals are ordinarily found in pegmatites and certain metamorphic rocks, all known occurances of red beryl are found in topaz-bearing rhyolites (rhyolite is a high silica volcanic rock). Crystal growth occurs under low pressure and high temperature conditions from a pneumatolitic phase along fractures or within near-surface miarolitic cavities in the rhyolite. Associated minerals include bixbyite, quartz, orthoclase, topaz, spessartine, pseudobrookite and hematite - at each of the locations the minerals found in the crystal vugs is slightly different, and not all associated minerals are found at all of the locations.
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Please note that the author, Chris Ralph, retains all copyrights to this entire document and it may not be reproduced, quoted or copied without permission.
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