Diamonds - Minerals are Crystals
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Early man also might have found bits of turquoise that occurred naturally in areas of
They might have also found the earliest types of precious gems in the form of natural crystals, such as quartz or diamonds.
Isometric, or cubic crystals are shaped like blocks and are symmetrically shaped. An example of an isometric crystal would be pyrite. This is also called fool’s gold because it has a metallic yellow or brassy color similar to gold.
Tetragonal, where the crystals are shaped like four-sided prisms and pyramids. An example of a tetragonal crystal is the zircon.
Hexagonal crystals are shaped like six-sided prisms, or pyramids. An example of this kind of crystal is the beryl, which includes gems like emeralds and aquamarines.
Orthorhombic crystals. An example of an orthorhombic crystal is topaz. Topaz can come in a variety of colors, although the mostly highly prized is a deep amber color. At one time, topaz was much more valuable, until rich veins of it were found in
Monoclinic crystals are short and stubby, with tilted faces at each end. Monoclinic crystals include gypsum.
Tri-clinic crystals are usually flat with sharp edges but no right angles. Each crystal has three unequal axes. An example of tri-clinic crystal is feldspar.
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