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Single Emerald Crystal

The Mineral emerald




Emerald is the green variety of Beryl, and its most precious and valuable variety. Its intense green color has given it status as an important gemstone throughout the centuries. The color of Emerald is green to emerald-green. The light green form of Beryl is not recognized as Emerald, but rather Green Beryl. The deep color of Emerald is caused by traces of the element chromium, but sometimes also vanadium.

The ancient source of Emeralds in the old world was from Egypt, but their quality was not exceptional. However, the Native South American civilizations such as the Incas have had high quality Emeralds from the mines of Colombia, which have traditionally produced the highest quality Emeralds and continue doing so.

Emeralds can be transparent and gemmy, in which case they are extremely valuable, or they can be in opaque or semi-opaque forms which are much more common and not as valuable.

For additional information, see the gemstone section on Emerald.
Chemical Formula Be3Al2SiO6
Composition Beryllium aluminum silicate
Color Green to emerald-green
Streak Colorless
Hardness 7.5 - 8
Crystal System Hexagonal
3D Crystal Atlas
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Crystal Forms
and Aggregates
Emerald often crystallizes in perfect, six-sided hexagons. Crystals are usually as individual prismatic hexagons. Less commonly in short, stubby crystals and crystal plates. The bases of Beryl crystals are usually flat; pyramidal terminations are very  rare. Also occurs in columnar aggregates and in massive. Occasionally in drusy or platy aggregates and as bundles of thin, long crystals. Crystals may be striated lengthwise.
Transparency Transparent to opaque
Specific Gravity 2.6 - 2.9
Luster Vitreous
Cleavage 3,1 - basal
Fracture Uneven to conchoidal
Tenacity Brittle
In Group Silicates; Cyclosilicates
Striking Features Emerald green color and hexagonal crystal habit.
Environment In granite pegmatites and in metamorphosed mica schists.
Rock Type Igneous, Metamorphic
Popularity (1-4) 1
Prevalence (1-3) 3
Demand (1-3) 1

Emerald ON EBAY

VARIETIES
 -  High-quality Emerald from the mines of Colombia of South America. These Emeralds are considered to be the highest quality.
 -  Rare form of Emerald that exhibits a radiating star pattern with raylike spokes of impurities that give the Emerald a six-pointed asterisk-shaped pattern.

USES
Emerald is one of the most valuable gemstones. It is the most famous green gemstone, and its deep emerald-green color gives it its unique status. It is used in all forms of jewelry, and less transparent stones are cut into cabochons. Good quality Emerald specimens are highly valued by collectors.

NOTEWORTHY LOCALITIES
The finest Emeralds have traditionally come from the mines of Boyacá Department, Colombia. These mines are still producing today, and specific localities include the Muzo, Chivor, and La Pita mines. Brazil has also produces many Emeralds, in Carnaiba and Socoto in Brumado, Bahia, Brazil.

The two most classic old-world localities of Emerald are the Sikait-Zabara region, Egypt (known as Cleopatra's Mines); and Habachtal, Salzburg, Austria. Other important Emerald deposits are in the Panjshir Valley, Panjshir Province, Afghanistan; Dayakou, Wenshan, Yunnan Province, China; Malyshevo, near the Tokovaya River, Yekaterinburg, Ural Mountains, Russia; the Byrud Emerald Mine, Minnesund, Eidsvoll, Norway; and the Rio Maria III Mine, Gité, Zambezia Province, Mozambique. Outstanding Emeralds, close in quality to those of Colombia, come from the Kagem Emerald Mine, Ndola, Zambia. This mine has been a major producer of high-quality gem grade Emerald.

In the U.S., Emeralds come from North Carolina at Hiddenite amd Stony Point, Alexander Co.; and from Spruce Pine, Mitchell Co.

COMMON MINERAL ASSOCIATIONS
Quartz, Calcite, Orthoclase, Muscovite, Albite, Pyrite

DISTINGUISHING SIMILAR MINERALS
Emerald is unique in color and crystal habit, although green Tourmaline may be similar, but is striated lenghtwise whereas Beryl is striated crosswise.


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