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[mass noun] A hard mineral consisting of silica, found widely in igneous and metamorphic rocks and typically occurring as colourless or white hexagonal prisms. It is often coloured by impurities (as in amethyst, citrine, and cairngorm).
- ‘My necklaces are made mainly of semiprecious stones, such as agate, quartz, amber, rock crystal and jade.’
- ‘Because they formed within the peat, coal balls generally contain very little detrital clay minerals and quartz.’
- ‘Mylonitic rocks usually have ribbon quartz and rotated albite porphyroclasts.’
- ‘Late chlorite and carbonates overgrew the schistosity defined by phengite, chlorite and quartz.’
- ‘There is much chlorite growth, but quartz is only very poorly recrystallized.’
- ‘Adjacent to the gray quartz with acanthite and gold is sugary white quartz with massive galena.’
- ‘Some topaz forms spectacular crystals and matrix specimens on magnesite or quartz.’
- ‘The ore zone is a combination of veinlets, lenses, and nests of pyrite and quartz.’
- ‘As a result, quartz is an uncommon gangue mineral within most of the district.’
- ‘The white material is quartz and the black is the wall rock from the edge of the vein.’
- ‘These granite dikes are composed almost totally of potassium feldspar and quartz.’
- ‘The siltstones are composed of angular quartz and rare feldspar, set in a finer matrix that locally contains some calcite.’
- ‘The intervening area is dominantly a mixture of clay and quartz.’
- ‘The grey colour of quartz is a mineralogical standard showing that the thickness is correct.’
- ‘Outside we saw large tables covered high with specimens of kyanite in quartz.’
- ‘Other minerals found here are the red ochre, soap stone, white quartz and molding sand.’
- ‘Where pyrite crystals have been lost, it can be seen that quartz did not penetrate pyrite.’
- ‘The sample is strongly foliated and consists of garnet, biotite, quartz, plagioclase and cordierite.’
- ‘These soils have a typical, immature tropical soil mineral assemblage dominated by kaolin, quartz and goethite.’
- ‘All three are dominated by unaltered muscovite, quartz, K-feldspar and albite, with minor epidote.’
Mid 18th century: from German Quarz, from Polish dialect kwardy, corresponding to Czech tvrdý hard.
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