By Roger R. Harding, R.F. Symes
This Eyewitness advisor to crystals and gems offers info on all elements of this subject, in addition to displaying the reader diamonds getting used to chop via a brick wall and the place crystals develop in your house. a while 10+
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Extra info for Crystal and Gem
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White and cream nephrites contain very little iron. More iron causes the spinach-green stones of the USSR, Canada, and New€Zealand and the black jade of South Australia. Nephrite is made of interlocking grains, making the stone tough. The “greenstone” used by the Maoris of New Zealand is nephrite. 1. RHODONITE The bright pink color of€rhodonite (rhodo means pink) is caused by manganese. It has a hardness of about 6 and is used for carving and inlays. Sources of gem€material include USSR, Canada, and Australia.
46) in gem gravel but they are rarely found in their source rock. This sapphire from Myanmar has grown with crystals of spinel. The crystals grew in conditions of high temperature and€pressure. Some rubies display stars caused by fine needlelike inclusions (p. 21) of rutile. The Rosser Reeves ruby is one of the finest. C. Blue buddha Queen cameo These gems were mounted on a rock crystal pitcher in about 1660. The pitcher was rediscovered in 1985. In the center is a ruby cameo of the head of Queen Elizabeth I of England.
This specimen of pink grossular from Mexico clearly shows dodecahedral crystals, one of the two major habits of garnet. 40. Peridot Peridot is a French word and may derive from the Arabic faridat, meaning a gem. It is the gem variety of the mineral olivine, a magnesium and iron silicate that is common in volcanic rocks. Olivine-rich rock ISLAND GEM Lava Peridot usually occurs in rocks intergrown with other minerals. The island of Zabargad in the Red Sea is one of the few places in the world where crystals with distinct faces, such as these, are found.