Aedelite was the first gemstone to be named after a person. It was named in honor of the Dutch mineralogist Colonel Hendrik Von Prehn, who was credited with making discoveries in South Africa in the 1700s. Grapevine varies in color from pale green to pale yellowish green and is strong and durable in jewelry.
[Aedelite]
Type: Silicate mineral
Chemical composition: Ca2Al(AlSi3O10)(OH)2, may contain Fe, Mg, Mn, Na, K and other elements
Transparency: transparent - translucent
Luster: glassy
Optical Characteristics: biaxial crystal, non-homogeneous body
Refractive index: 1.616～1.649
Birefringence: 0.020 ~ 0.035
Mohs hardness: 6 ~ 6.5
Density: 2.80g/cm3 ~ 2.95g/cm3
Crystal system: rhombohedral crystal system
Fracture: Parabolic fracture
[Origin]
The origin of Aedelite is mainly the United States, Canada, Scotland, France, Portugal, Germany, Austria, Switzerland, Italy, Yugoslavia, Russia, Pakistan, India, Japan, Australia, South Africa and so on.
China's Aedelite, produced in Sichuan Province, Luzhou, Leshan and other places. The stone is mostly green in color, and there is a raised color block on the stone surface, which is named for its shape like grapes.
[Color Shape]
Aedelite range in color from light green to gray, as well as shades of white, yellow and red, but green is common, and yellow is extremely rare and precious.
Their shapes include slabs, flakes, grapes, kidneys, radials or massive aggregates. A good quality Aedelite can be used as a gemstone, and this gemstone is popularly known as the Cape of Good Hope emerald.
[How to choose a Aedelite?]
Good quality Aedelite will produce similar to glass seed emerald general "fluorescence", overall green tone dominated Aedelite must be with yellow or gray tone, yellow tone dominated Aedelite is usually the color is brighter but not bright, with gray tones, rarely appear golden yellow, extremely rare and precious.
[Identification]
(1) Magnified observation: fiber-like structure, radial arrangement.
(2) Heating and melting will foam and become white glassy
(3) With white streaks
[Care]
Normally can be cleaned with water, do not contact with alkali.
Aedelite's hardness is on the low side, please be careful not to touch friction with hard objects when wearing.
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