A green gem variety of Beryl, highly sought after as a precious gem stone. The majority of the world's gem quality Emeralds come from the Muzo area of Colombia.
The colour in Emerald is caused by trace amounts of a chromophore such as Chromium or Vanadium.
Chemical Group: silicate
Chemical Formula: Be3Al2(SiO3)6
Color: emerald green, pale green, light blue, yellow, white, pink Streak: white
Luster: vitreous or resinous Transparency: transparent to subtranslucent
Hardness: 7.5 to 8 Specific Gravity: 2.63 to 2.80
Fracture: conchoidal to uneven
Cleavage: imperfect and indistinct
Crystal Forms: Hexagonal system
Crystals are usually 6-sided prisms capped with flat surfaces.
Mineral Associations: found in pegmatites
Identifying Characteristics: crystal shape and a pale-green color
Uses: as a gemstone; also as a source of the element beryllium
Occurrences: Colombia, Afghanistan, Brazil, Russia, Madagascar, SW Africa;
in the U.S. in Maine, New Hampshire, Connecticut, north Carolina, California
Toxicity: when-swallowed- when inhaled-
If gemstone quality: green is emerald, bluish green is aquamarine,
pink is morganite, yellow is golden beryl or heliodor.
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