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Michel-Lévy interference colour chart issued by Zeiss Microscopy. In optical mineralogy, an interference colour chart, also known as the Michel-Levy chart, is a tool first developed by Auguste Michel-Lévy to identify minerals in thin section using a petrographic microscope.
The "chelsea" filter was originally devised by Anderson and Payne in 1934 of the Gem testing Laboratory of the London Chamber of Commerce & Industry.The filter was devised with the collaboration of gemmology students of the Chelsea College of Science and Technology where Basil Anderson was an instructor for the Gemmological Association of Great Britain.
Topaz is a silicate mineral made of aluminum and fluorine with the chemical formula Al 2 Si O 4 (F, OH) 2.It is used as a gemstone in jewelry and other adornments. Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow-orange. [7]
The 11 bracelets with 2 red, 2 yellow and 2 green beads. The leftmost one and the four rightmost ones are chiral, so there are 16 necklaces. Compare box(6,7) in the triangle. 16 tiles from the game Tantrix , corresponding to the 16 necklaces with 2 red, 2 yellow and 2 green beads.
Main jade producing countries. Jade is an umbrella term for two different types of decorative rocks used for jewelry or ornaments.Jade is often referred to by either of two different silicate mineral names: nephrite (a silicate of calcium and magnesium in the amphibole group of minerals), or jadeite (a silicate of sodium and aluminum in the pyroxene group of minerals). [1]
Topaz, a silicate mineral of aluminium and fluorine; Chrysoberyl, an aluminate of beryllium; Zircon, a mineral belonging to the group of nesosilicates; Prehnite, an inosilicate of calcium and aluminium; Tourmaline, a crystalline boron silicate mineral compounded with other elements; Apatite, a group of phosphate minerals
A color code is a system for encoding and representing non-color information with colors to facilitate communication. This information tends to be categorical ...
A decorative gold charm bracelet showing a heart-shaped locket, seahorse, crystal, telephone, bear, spaceship, and grand piano. Chain mail bracelet, in Byzantine weave, with silver-plated copper rings and green aluminium rings. A bracelet is an article of jewellery that is worn around the wrist. Bracelets may serve different uses, such as being ...