| 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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| quartz |
A form of silicone dioxide. Commonly used in the making of radio transmitters and heat resistant products.
출처: www.angelfire.com/pa/baconbacon/page4.html
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| quarter |
a section of the surface of a millstone defined by master furrows, not necessarily one-fourth the surface area of a millstone. Quarter dress- a form of millstone dress using a series of straight furrows, the largest of which divide the surface of the millstone into regions called "quarters." Quern- a simple form of rotary grist mill, consisting of a stationary lower bed stone and an upper runner stone usually rotated by hand with the aid of a stick or lever fastened to the upper stone. ...
출처: www.angelfire.com/journal/pondlilymill/glossary.ht...
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