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Nephrite is a variety of the calcium, magnesium, and iron-rich amphibole minerals tremolite or actinolite (aggregates of which also make up one form of asbestos). The chemical formula for nephrite is Ca 2 ( Mg , Fe ) 5 Si 8 O 22 (O H ) 2 . [ 1 ]
Main jade producing countries. Jade is an umbrella term for two different types of decorative rocks used for jewelry or ornaments.Jade is often referred to by either of two different silicate mineral names: nephrite (a silicate of calcium and magnesium in the amphibole group of minerals), or jadeite (a silicate of sodium and aluminum in the pyroxene group of minerals). [1]
In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...
Common Nephrite: Also known as Common Jade, this is the most commonly encountered type of nephrite. It is translucent with a glassy luster, and the crystal grain sizes of its constituent minerals range from 40 to 150 micrometers. Cat's Eye Nephrite: Also known as Cat's Eye Jade or Taiwan Cat's Eye, this type of nephrite exhibits the cat's eye ...
This is a list of minerals which have Wikipedia articles. ... Jade (tough, green mineral either jadeite or nephrite amphibole) Jasper (variety of quartz)
Nephrite, one of the two minerals known as the gemstone jade, is a green crystalline variety of tremolite. The fibrous form of tremolite is one of the six recognised types of asbestos. This material is toxic, and inhaling the fibers can lead to asbestosis, lung cancer and both pleural and peritoneal mesothelioma.
Jadeite is the principal mineral making up the most valuable form of jade, a precious stone particularly prized in China. Most gem-quality jadeite jade comes from northern Myanmar. Jade tools and implements have been found at Stone Age sites, showing that the mineral has been prized by humans since before the beginning of written history.
Bowenite is the state mineral of the U.S. state of Rhode Island. [2] Most deposits of bowenite are small, [citation needed] although a large deposit was discovered in South Africa in 1989. [citation needed] Deposits in China are in the Suzhou region, which accounts for its also being known as Suzhou jade with carving in elaborate designs. [12]