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Agate is also still used today for decorative displays, cabochons, beads, carvings and Intarsia art as well as face-polished and tumble-polished specimens of varying size and origin. Idar-Oberstein was one of the centers which made use of agate on an industrial scale. Where in the beginning locally found agates were used to make all types of ...
Fordite, also known as Detroit agate, Motor City agate, [1] paint rock, or paint slag, [2] is a lapidarist term for polished pieces of finely layered paint masses from automobile factories. The masses consist of automotive paint which has hardened sufficiently to be cut and polished.
Other members of the cryptocrystalline silica family include agate, carnelian, and onyx. Unlike many non-transparent silica minerals, it is the color of chrysoprase, rather than any pattern of markings, that makes it desirable. The word chrysoprase comes from the Greek χρυσός chrysos meaning 'gold' and πράσινον prasinon, meaning ...
Glassy stones (flint, quartz, jasper, agate) were used with a variety of iron pyrite or marcasite stones as percussion fire starter tools. That was the most common method of producing fire in pre-industrial societies. Stones were later superseded by use of steel, ferrocerium and matches.
Colour used for TfL Cycle Superhighways; [6] colour of the University of Barcelona and VU Amsterdam, original colour of FMŻ Bizon Z058 Rekord since the year 1999, main colour of the Helsinki Regional Transport Authority (HSL). RAL 5017: Traffic blue: Ghent University: RAL 5018: Turquoise blue: RAL 5019: Capri blue: RAL 5020: Ocean blue: RAL ...
A geode of chalcedony richly colored by hematite that gives it its rusty hues and marks it as Akik [contradictory]. Aqeeq, akik or aqiq (Arabic: العقيق) means quartz in Arabic, and agate in Turkish, however in the context of rings usually refers to a ring set with a chalcedony stone.
In addition to being used to devolve conditions of metamorphism, garnets can be used to date certain geologic events. Garnet has been developed as a U-Pb geochronometer , to date the age of crystallization [ 48 ] as well as a thermochronometer in the (U-Th)/He system [ 49 ] to date timing of cooling below a closure temperature .
The primary use of apatite is as a source of phosphate in the manufacture of fertilizer and in other industrial uses. It is occasionally used as a gemstone. [ 27 ] Ground apatite was used as a pigment for the Terracotta Army of 3rd-century BCE China, [ 28 ] and in Qing dynasty enamel for metalware .