| quartz |
quartz glass: colorless glass made of almost pure silica a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities
출처: wordnet.princeton.edu/perl/webwn
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| quartz glass |
colorless glass made of almost pure silica
출처: wordnet.princeton.edu/perl/webwn
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| quartz |
Quartz is the second most abundant mineral in the Earth's crust. It has a hexagonal crystal structure made of trigonal crystallized silica (silicon dioxide, SiO2), with a hardness of 7 on the Mohs scale. Density is 2.6 g/cm³. The typical shape is a six-sided prism that ends in six-sided pyramids, although these are often distorted, or so massive that only part of the shape is apparent from a mined specimen. ...
출처: en.wikipedia.org/wiki/Quartz
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| quartz |
A mineral composed of the elements silicon and oxygen (silicon dioxide) that occurs in multiple forms.
출처: www.modernhumanorigins.com/q.html
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| quartz |
a crystalline mineral, often transparent, in which gold and silver veins were most commonly found.
출처: members.tripod.com/~mr_sedivy/colorado41.html
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