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Nowadays, it is most commonly used for gemstone purposes. The gem value of goshenite is relatively low. However, goshenite can be colored yellow, green, pink, blue and in intermediate colors by irradiating it with high-energy particles. The resulting color depends on the content of Ca, Sc, Ti, V, Fe, and Co impurities.
Blue John (mineral) Bowl made from Derbyshire Blue John, on display in Castleton Visitor Centre. French candelabra crafted of Blue John, c. 1860. Blue John (also known as Derbyshire Spar) is a semi-precious mineral, a rare form of fluorite with bands of a purple-blue or yellowish colour. In the United Kingdom it is found only at Blue John ...
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]
MLCS 2006/43120 (P) Harold and the Purple Crayon is a 1955 children's picture book written and illustrated by Crockett Johnson. Published by HarperCollins Publishers, it is Johnson's most popular book, and has led to a series of other related books, as well as many adaptations. The story is written in third-person point-of-view, and follows a ...
Emerald is a gemstone and a variety of the mineral beryl (Be 3 Al 2 (SiO 3) 6) colored green by trace amounts of chromium or sometimes vanadium. [2] Beryl has a hardness of 7.5–8 on the Mohs scale. [2] Most emeralds have many inclusions, [3] so their toughness (resistance to breakage) is classified as generally poor.
The color is white, sometimes greyish, bluish, or purple. On the best developed of the three cleavages, the lustre is pearly; on other surfaces it is glassy. When exposed to water, anhydrite readily transforms to the more commonly occurring gypsum, (CaSO 4 ·2H 2 O) by the absorption of water.