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Agate (/ ˈ æ ɡ ɪ t / AG-it) is a variety of chalcedony, [1] which comes in a wide variety of colors. Agates are primarily formed within volcanic and metamorphic rocks.The ornamental use of agate was common in ancient Greece, in assorted jewelry and in the seal stones of Greek warriors, [2] while bead necklaces with pierced and polished agate date back to the 3rd millennium BCE in the Indus ...
Whether a gemstone is a natural stone or synthetic, the chemical, physical, and optical characteristics are the same: They are composed of the same mineral and are colored by the same trace materials, have the same hardness and density and strength, and show the same color spectrum, refractive index, and birefringence (if any). Lab-created ...
The Māori word pounamu is derived from namu, an archaic word that describes blue-green (or 'grue') cognate with Tahitian ninamu. [2] Pounamu, also used in New Zealand English, in itself refers to two main types of green stone valued for carving: nephrite jade, classified by Māori as kawakawa, kahurangi, īnanga, and other names depending on colour; and translucent bowenite, a type of ...
North American Indian Jewelry and Adornment: From Prehistory to the Present. New York: Harry N. Abrams, 1999: 170-171. ISBN 0-8109-3689-5. Haley, James L. Apaches: a history and culture portrait. Norman: University of Oklahoma Press, 1997. ISBN 978-0-8061-2978-5. Karasik, Carol. The Turquoise Trail: Native American Jewelry and Culture of the ...
Sometimes natural bands agate beads without and artificial etchings are also viewed as a type of dzi by Tibetans. The number of "eyes", or circular designs on the stone, is considered significant when considering the importance of a dzi. The symbolic meaning of dzi beads are sometimes based on the number and arrangement of the dots. [citation ...
Jet has been used in Britain since the Neolithic period [26] It continued in use in Britain through the Bronze Age where it was used for necklace beads. [26] Jet necklaces following the plate and spacer design may have been based on Gold lunula. [27] During the Iron Age jet went out of fashion until the early 3rd century AD in Roman Britain.
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