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Following the discovery of a new locality for rose beryl in Madagascar in 1910, George Kunz proposed the name morganite at a meeting of the New York Academy of Sciences on 5 December 1910 to honour his friend and customer J.P. Morgan [6] [7] for his financial support for the arts and sciences, and his important gifts of gems to the American Museum of Natural History in New York and to the ...
Generally, dark navy blue chrysocolla is too soft to be used in jewelry, while cyan, green, and blue-green chrysocolla can have a hardness approaching 6, similar to turquoise. Chrysocolla chalcedony is a heavily silicified form of chrysocolla that forms in quartz deposits and can be very hard and approach a hardness of 7. [9] [10] [11]
Carnelian (also spelled cornelian) [3] is a brownish-red mineral commonly used as a semiprecious stone.Similar to carnelian is sard, which is generally harder and darker; the difference is not rigidly defined, and the two names are often used interchangeably.
Prehnite is an inosilicate of calcium and aluminium with the formula: Ca 2 Al(AlSi 3 O 10)(OH) 2 with limited Fe 3+ substitutes for aluminium in the structure. [7] Prehnite crystallizes in the orthorhombic crystal system, [7] and most often forms as stalactitic, botryoidal, reniform or globular aggregates, [8] with only just the crests of small crystals showing any faces, which are almost ...
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