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Viking explorers used thin pieces of Iolite as the world’s first polarizing lens to help them determine the exact location of the sun for navigation
and Canada
Red Lightning Agate is predominantly red with swirls and mottling of green
Terahertz is a spectacular man made ore
Mohs Hardness: 7
Kyanite 3-5mm Graduated Faceted Rondelle - 15-16 Inch Supplies-Resources-Tools-Pliers-Cutters Viking explorers used thin piecesKyanite often occurs as long, bladed, striated crystals, transparent or translucent with a pearly luster. An aluminum silicate mineral, it may appear in white, pink, yellow, orange, green, blue, gray and black. In addition to its value as a gemstone, Kyanite is also extremely useful in industrial applications due to its high heat resistance. It is often used in kiln furniture and foundry molds, as well as for brake shoes, grinding wheels and cutting
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