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  • Agate is a micro crystalline variety of silica, chiefly chalcedony, characterized by its fineness of grain and brightness of color. This particular agate came from the shores of Lake Superior in Michigan. Specimen Dimension: approximately 4 cm.
    K12-Sup-agate4232.jpg
  • Agate is a micro crystalline variety of silica, chiefly chalcedony, characterized by its fineness of grain and brightness of color. This particular agate came from the shores of Lake Superior in Michigan. Specimen Dimension: approximately 4 cm.
    K12-Sup-agate4210.jpg
  • .Faceted quartz crystals. Close-up of quartz or silicon dioxide (SiO2), one of the commonest minerals in the Earth's crust (12% by volume). The pure, colorless variety is also known as rock crystal and is used as a gemstone and highly prized by collectors. When it contains impurities, these impart a range of colors including white, yellow, pink, blue, green and smoky brown..
    K10quartz3623.JPG
  • .Faceted quartz crystals. Close-up of quartz or silicon dioxide (SiO2), one of the commonest minerals in the Earth's crust (12% by volume). The pure, colorless variety is also known as rock crystal and is used as a gemstone and highly prized by collectors. When it contains impurities, these impart a range of colors including white, yellow, pink, blue, green and smoky brown..
    K10quartz3624.JPG
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Ted Kinsman

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