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Though white schiller is the most common, in rarer specimens, orange or blue lusters are produced. [2] This effect is most typically produced by adularia, a K-feldspar or orthoclase (KAlSi 3 O 8), from which the name is derived. [3] [4] [5] Adularescence appears in numerous other gemstones, notably common opal, rose quartz and agate. However ...
Elvan is a name used in Cornwall and Devon for the native varieties of quartz-porphyry. They are dispersed irregularly in the Devonian series of rocks and some of them make very fine building stones (e.g. Pentewan stone, Polyphant stone and Catacleuse stone).
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.
The unusual blue coloration of the quartz is thought to be due to ilmenite inclusions. It is named after Llano County, Texas, the only place where it is found. [1] Location of Llano County. The geology of northeast Africa is very similar to that of Texas, and many of the two regions' minerals and fossils are only found in these two locations. [2]
Chrome-bearing fuchsite (a variety of muscovite mica) is the classic inclusion and gives a silvery green or blue sheen. Oranges and browns are attributed to hematite or goethite . Because aventurine is a rock , its physical properties vary: its specific gravity may lie between 2.64–2.69 and its hardness is somewhat lower than single-crystal ...
A view down onto the sheets of the A 2 B(T 2 O 7) melilite structure.The A sites are yellow spheres, the B sites are pale orange tetrahedra, and the T sites are blue tetrahedra. . Oxygen atoms (not shown) are on the corners of the tetrahed
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