All posts tagged "chalcedony"

  • Gem Profile July 13: Onyx

    by Rose Marion, Onyx Onyx comes from the Greek word for nail. Nail? Yes! While many of us think of the color black when onyx comes up, onyx is a variety of chalcedony that can be...

    • Posted July 13, 2012
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  • Gem Profile July 6: Psilomelane

    by Rose Marion, Psilomelane Psilomelane, also rarely called psilomelanite and black hematite, is an umbrella name for manganese oxides, which are black stones. The name was chosen in 1758 and comes from the Greek for "smooth"...

    • Posted July 6, 2012
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  • Gem Profile June 29: Chrysoprase

    by Rose Marion, Chrysoprase Shop Chrysoprase Beads Chrysoprase is the apple-green form of chalcedony, instantly recognizable by its color, which is caused by nickel. Chrysoprase can be opauque, semitransparent, and even slightly translucent. Chrysoprase is found...

    • Posted June 29, 2012
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  • Gem Profile June 22: Chrysocolla

    by Rose Marion, Chrysocolla Shop Chrysocolla Beads | Shop Chrysocolla Cabochons Chrysocolla, also called gem silica is found in large deposits and is fairly common; yet gem-quality chrysocolla is very hard to come by. Why? Because...

    • Posted June 22, 2012
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  • Gem Profile June 15: Carnelian

    by Rose Marion, Carnelian Shop Carnelian Beads | Shop Carnelian Cabochons Carnelian is the rusty, red-orange translucent form of chalcedony. Sard is practically a synonym for carnelian, since there aren’t hard and fast rules about calling...

    • Posted June 15, 2012
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  • Gem Profile June 8: Chalcedony

    by Rose Marion, Chalcedony Shop Chalcedony Beads Chalcedony used to be considered a fibrous variety of quarts. However, it has been shown to contain quartz as well as moganite, a different form of silicon dioxide with...

    • Posted June 8, 2012
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  • Gem Profile April 20: Cryptocrystalline Quartz Introduction

    by Rose Marion, Cryptocrystalline Quartz Introduction, one in a Series on Quartz Shop Agate Cabochons | Shop Agate Beads As you have become aware in recent months, there are many, many kinds of quartz dug from...

    • Posted April 20, 2012
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