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2. Native American jewelry - Wikipedia

   en.wikipedia.org/wiki/Native_American_jewelry

   Native American jewelry. Native American jewelry refers to items of personal adornment, whether for personal use, sale or as art; examples of which include necklaces, earrings, bracelets, rings and pins, as well as ketohs, wampum, and labrets, made by one of the Indigenous peoples of the United States. Native American jewelry normally reflects ...

3. Chrysocolla - Wikipedia

   en.wikipedia.org/wiki/Chrysocolla

   Chrysocolla has a cyan (blue-green) color and is a minor ore of copper, having a hardness of 2.5 to 7.0. It is of secondary origin and forms in the oxidation zones of copper ore bodies. Associated minerals are quartz, limonite, azurite, malachite, cuprite, and other secondary copper minerals. It is typically found as botryoidal or rounded ...

4. Egyptian blue - Wikipedia

   en.wikipedia.org/wiki/Egyptian_blue

   Egyptian blue, also known as calcium copper silicate (CaCuSi 4 O 10 or CaOCuO (SiO 2) 4 (calcium copper tetrasilicate)) or cuprorivaite, [1] is a pigment that was used in ancient Egypt for thousands of years. It is considered to be the first synthetic pigment. [2] It was known to the Romans by the name caeruleum.

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   mail.aol.com

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6. Ostrich eggshell beads - Wikipedia

   en.wikipedia.org/wiki/Ostrich_eggshell_beads

   The manufacture of ostrich eggshell beads varies a bit from region to region, but generally follows similar steps. First, an ostrich egg is hit with a hammerstone, or an eggshell fragment is found. Then, bead blanks are selected from those fragments. The next two steps can be performed in either order depending on the group making the beads ...

7. Turquoise - Wikipedia

   en.wikipedia.org/wiki/Turquoise

   Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6 (PO 4) 4 8 ·4H 2 O. It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.