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Bretonstone, also known as vibro-compression under vacuum, is a formerly-patented technology [2] [3] invented in the early-1970s [citation needed] by Breton S.p.A. [4]Nowadays most manufacturers of engineered stone use similar technology, typically involving quartz and a resin binder combined under vacuum, and compressed under heat into a desired form such as a countertop slab.
Hardstone carving, in art history and archaeology, is the artistic carving of semi-precious stones (and sometimes gemstones), such as jade, rock crystal (clear quartz), agate, onyx, jasper, serpentinite, or carnelian, and for objects made in this way. [1] [2] Normally the objects are small, and the category overlaps with both jewellery and ...
Quartz from Brazil with visible surface staining, sometimes incorrectly identified as citrine. Clear quartz with natural iron inclusions or limonite staining may resemble citrine. [2] However, these crystals will either have coloration only on the surface or in certain spots within the crystal. Quartz that derives its color from coatings or ...
Engineered quartz is widely used in the developed world for counter tops, window sills, and floor and wall coverings. The vast majority of engineered stone companies are located in Greater China, India, and its birthplace in Italy. [citation needed] One form invented in the early 1980s is Bretonstone.
The private Spanish company Cosentino brand Silestone and the public Israeli company Caesarstone are the most recognizable brands for quartz, as well as Totem Quartz, an Iranian company which has a huge market in the middle east and Central Asia. Gulfstone, an Oman-based company, is the only producer of engineered quartz stone in the GCC.
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Quartzolite or silexite is an intrusive igneous rock, in which the mineral quartz is more than 90% of the rock's felsic mineral content, with feldspar at up to 10%. [ 1 ] : 135 [ 2 ] Typically, quartz forms more than 60% of the rock, [ 3 ] the rest being mostly feldspar although minor amounts of mica or amphibole may also be present. [ 2 ]
Ball clays are kaolinitic sedimentary clays that commonly consist of 20–80% kaolinite, 10–25% mica and 6–65% quartz, along with small amounts of organic matter (such as lignite) and trace amounts of other minerals such as pyrite and siderite.