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Jasper. Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases, [ 1][ 2] is an opaque, [ 3] impure variety of silica, usually red, yellow, brown or green in color; and rarely blue. The common red color is due to iron (III) inclusions. Jasper breaks with a smooth surface and is used for ...
The Hebrews obtained gemstones from the Middle East, India, and Egypt. [ 1] At the time of the Exodus, the Bible states that the Israelites took gemstones with them ( Book of Exodus, iii, 22; xii, 35–36). When they were settled in the Land of Israel, they obtained gemstones from the merchant caravans travelling from Babylonia or Persia to ...
Gemstone. Group of precious and semiprecious stones—both uncut and faceted—including ( clockwise from top left) diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster. A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or ...
Gemstones of the World revised 5th edition, 2013 by Walter Schumann ISBN 978-1454909538 Smithsonian Handbook: Gemstones by Cally Hall, 2nd ed. 2002 ISBN 978-0789489852 v
Tiger iron is an altered rock composed chiefly of tiger's eye, red jasper and black hematite. The undulating, contrasting bands of colour and lustre make for an attractive motif and it is mainly used for jewellery-making and ornamentation. Tiger iron is a popular ornamental material used in a variety of applications, from beads to knife hilts.
Hardstone carving, in art history and archaeology, is the artistic carving of semi-precious stones (and sometimes gemstones ), such as jade, rock crystal (clear quartz ), agate, onyx, jasper, serpentinite, or carnelian, and for objects made in this way. [1] [2] Normally the objects are small, and the category overlaps with both jewellery and ...
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