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Rutilated quartz used as a gemstone. Rutilated quartz is a variety of quartz which contains acicular (needle-like) inclusions of rutile. [1] It is used for gemstones. These inclusions mostly look golden, but they also can appear silver, copper red or black.
Extended crystal structure of rutile. Rutile has a tetragonal unit cell, with unit cell parameters a = b = 4.584 Å, and c = 2.953 Å. [8] The titanium cations have a coordination number of 6, meaning they are surrounded by an octahedron of 6 oxygen atoms. The oxygen anions have a coordination number of 3, resulting in a trigonal planar ...
Acicular, in mineralogy, refers to a crystal habit composed of slender, needle-like crystals. Crystals with this habit tend to be fragile. Complete, undamaged acicular specimens are uncommon. Needle-shaped acicular millerite crystals on white quartz. The term "acicular" derives from the Late Latin "acicula" meaning "little needle". [1]
Quartz crystal demonstrating transparency. Pure quartz, traditionally called rock crystal or clear quartz, is colorless and transparent or translucent and has often been used for hardstone carvings, such as the Lothair Crystal. Common colored varieties include citrine, rose quartz, amethyst, smoky quartz, milky quartz, and others. [33]
Rutilated quartz is a popular type of quartz containing needle-like inclusions. Ruby Rubies are known for their intense red colour and are among the most highly valued precious gemstones. Rubies have been treasured for millennia. In Sanskrit, the word for ruby is ratnaraj, meaning king of precious stones. Sapphire
Milky quartz. Falcon's Eye; Iris quartz; Hawk's-eye quartz - dab - Falcon's Eye; Cat's-eyes - dab - Hungarian cat's eyes; Rock crystal; Smoky quartz or morion Firestones; Rose quartz; Amatrix - dab - Amatrix quartz; Buddstone - dab - Buddstone quartz; Eosite. Goldstone - dab - Aventurine glass, Gold Buss an Aventurine simulant; Cairngorm - dab ...
Bernard’s most recent job at GM, one that he held for more than 17 years, was associate director for competitor intelligence, meaning his duties involved keeping GM informed about what other ...
Dumortierite crystallizes in the orthorhombic system typically forming fibrous aggregates of slender prismatic crystals. The crystals are vitreous and vary in color from brown, blue, and green to more rare violet and pink. Substitution of iron and other tri-valent elements for aluminium result in the color variations.
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