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Euclase
Chemical composition -- A hydrated beryllium aluminum silicate.
Color -- Colorless, light green or yellow, light to dark blue, violet.
EUCLASE
Overview: Named after the Greek word "euklas", in French "euclase", meaning "to break". The crystals of euclase are commonly prismatic with slanted termination faces.
Euclase: A silicate of alumina and glucina occuring as light green, transparent crystals with a brilliant clinodiagonal cleavage. Named after the Greek word "euklas", in French "euclase", meaning "to break", because it is so brittle.
Girl washing for euclase and topaz, 1978. Photo: Peter Keller
A prime world source of the lovely euclase is at Boa Vista near Rodrigo Silva, where sharply-terminated brilliant crystals occur in delicate shades of blue, green, yellow, and lavender.
Euclase
Crystallography: monoclinic
Colors: pale green or blue some yellow, colorless
Luster: vitreous
Hardness: 7.5
Specific gravity: 3.1
Cleavage : very good
Refractive index: avg. 1.665 v. .019
Crystal or stone size: ...
Aquamarine can be confused with blue topaz, blue tourmaline, sapphire, apatite, euclase, zircon, fluorite, and kyanite; however, simple tests can identify it. It is not synthesized for commercial use.
Other fake stones are Vanadium emerald is green beryl colored with vanadium, Uralian emerald is garnet, Cape emerald is prehnite, Prismatic emerald is euclase and Oriental emerald is green coloured sapphire.
Glucinum: (Also called "Beryllium") A rare silver-white metallic element resembling magnesium. It is only found in nature combined with other elements, usually silica or alumina, in the minerals phenacite, chrysoberyl, beryl, euclase, ...
13: Euclase
Sec. IV, Ch. 14: Garnet, Carbuncle, & Cinnamon Stone
Sec. IV, Ch. 15: Hematite
Sec. IV, Ch. 16: Hiddenite
Sec. IV, Ch. 17: Iolite
Sec. IV, Ch. 18: Jade
Sec. IV, Ch. 19: Jasper
Sec. IV, Ch.
 See also: Color, Gemstones, Gemstone, Cut, Stone
  
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