10mm Faceted Tourmaline Agate Gemstone Round Beads 15 Inch Loose. Quartz: from German word "Quarz", is the second most common mineral in the Earthscontinental crust. It is made up of a lattice of silica (SiO2) tetrahedra and has a hardness of 7 on the Mohsscale. Quartz goes by an array of different names. The most important distinction between types of Quartz is that of macrocrystalline (individual crystals visible to the unaided eye) and the microcrystalline or cryptocrystalline varieties (aggregates of crystals visible only under high magnification), often referred to as "Chalcedony".Tourmalated Quartz: is a formation of Quartz which contains "needle like" Tourmaline crystals that are common and attractive. Other interesting inclusions also found are rutile, gold, silver, pyrite and goethite. It is also referred to as "Sagenite", "Venus Hair Stone", "CupidsDarts" and "Fleches d'amour"
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