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| H. Von Prehn, a Dutch colonel, was credited with his discovery of Prehnite since 1774 at the Cape of Good Hope located in Africa. Early traders called the stone “Cape Emerald” for the hope of developing its green colour. Prehnite was formerly categorized as a “Zeolite” due to the fact that it is typically forms in the same zones and under related conditions as the Zeolite. Nowadays, geologist places it in the phyllosilicate class, which also includes Apophylite. Prehnite is a quite strong gemstone, quite defiant to pressures as well as, scratching. It is also consists of aluminium, calcium and silicon with several specimens that contains small outline of iron, as well. It is measured a secondary or second class of mineral, meaning that the gem did not form during the preliminary volcanic activity. Instead, the crystals were structure by events caused by the volcano, much after the detail. Colours: Prehnite stone is often available in oily, bright green, may also range from fair yellow to a brown colour. In fact, some fair yellow and brown. Prehnite is tough enough to be cut and may possibly illustrate the cat’s eye effect. Sources: Initially Prehnite was rare; South Africa is the only known location for several years. Eventually pockets of the stone were found throughout the world, including the US, Canada, Austria, Germany, France and India. |
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