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Smoky quartz is a brownish grey, translucent variety of quartz that ranges in clarity from almost complete transparency to an almost-opaque brownish-gray or black crystals. [6] The color of smoky quartz is produced when natural radiation, emitted from the surrounding rock, activates color centers around aluminum impurities within the ...
Minerals are distinguished by various chemical and physical properties. Differences in chemical composition and crystal structure distinguish the various species. Within a mineral species there may be variation in physical properties or minor amounts of impurities that are recognized by mineralogists or wider society as a mineral variety.
Smoky quartz with spessartine on top of feldspar matrix, featuring different crystal habits (shapes) In mineralogy , crystal habit is the characteristic external shape of an individual crystal or aggregate of crystals.
Spessartine on smoky quartz: Wushan Spessartine Mine, Tongbei, Fujian Province, China Reddish-orange spessartine Two "frog-eyes" of 1.8 cm each sit perched atop a matrix
Image Gemstones Notes Ref; Swat: Emerald, quartz, and epidote: Various types of quartz are found in the region. The image shows a specimen of aquamarine and emerald on quartz from Swat valley. [3] Dir: Corundum and quartz The image shows pink and purple crystals of corundum. [3] Mansehra: Corundum and smoky quartz: The image shows aquamarine on ...
A rough specimen of bloodstone. Heliotropes (from Ancient Greek ἥλιος (hḗlios) 'sun' and τρέπειν (trépein) 'to turn') (also called ematille, Indian bloodstones, or simply bloodstones) are aggregate minerals, and cryptocrystalline mixture of quartz that occurs mostly as jasper or sometimes as chalcedony (translucent).
Herkimer diamonds are double-terminated quartz crystals discovered within exposed outcrops of dolomite in and around Herkimer County, New York, and the Mohawk River Valley in the US. [ 1 ] [ 2 ] They are not diamonds ; the "diamond" in their name is due to both their clarity and well-formed faces.
Gemstone irradiation is a process in which a gemstone is exposed to artificial radiation in order to enhance its optical properties.High levels of ionizing radiation can change the atomic structure of the gemstone's crystal lattice, which in turn alters the optical properties within it. [1]