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A conoscopic interference pattern or interference figure is a pattern of birefringent colours crossed by dark bands (or isogyres), which can be produced using a geological petrographic microscope for the purposes of mineral identification and investigation of mineral optical and chemical properties.
The karambit or kerambit (as used in Indonesian), kurambik or karambiak (both from the Minangkabau language) is a small curved knife resembling a claw. It is most closely associated with the Minangkabau people of West Sumatra , Indonesia , but is also found throughout other ethnic groups in Southeast Asia .
Asterism on the surface of a blue star sapphire. A purple-pink star sapphire displaying asterism in a platinum ring.. An asterism (from Ancient Greek ἀστήρ (astḗr) 'star' and -ism) is a star-shaped concentration of light reflected or refracted from a gemstone.
Heating, either underground naturally by metamorphic processes, or artificially, removes the brown or burgundy colour component to produce a stronger violet-blue color and makes the stone "dichroic", which means it only reflects blue and violet. [30] Rarely, gem-quality tanzanite will heat to a green primary hue, almost always accompanied by a ...
The most popular form of sapphire is blue sapphire, which is known for its medium to deep blue colour and strong saturation. Fancy sapphires of various colours are also available. In the United States, blue sapphire tends to be the most popular and most affordable of the three major precious gemstones (emerald, ruby, and sapphire).
Stonesetting is the art of securely setting or attaching gemstones into jewelry. Cuts. Prefabricated settings for stones, to be attached to jewelry.
For other patterns and instructions see the talk page Wikimedia Commons has media related to Association football kit templates . For the most complete listing of templates available for use, see the Association football kit templates category on Wikimedia Commons.
Pattern welding is a practice in sword and knife making by forming a blade of several metal pieces of differing composition that are forge-welded together and twisted and manipulated to form a pattern. [1]