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Search Results for “Rock-Crystal”
 
 
1) rock crystal. The Columbia Encyclopedia, Sixth Edition. 2001
...rock crystal, see quartz....

2) Monte Alban. The Columbia Encyclopedia, Sixth Edition. 2001
...Monte Alban was built on an artificially leveled, rocky promontory above the Valley of Oaxaca. Located around an enormous plaza about 1,000 ft (300 m) long and 650...

3) silica. The Columbia Encyclopedia, Sixth Edition. 2001
...Pure silica is colorless to white. It occurs in several forms and is widely and abundantly distributed throughout the earth, both in the pure state and in silicates,...

4) glass. The Columbia Encyclopedia, Sixth Edition. 2001
...Composition and Properties of GlassMost glass is a mixture of silica obtained from beds of fine sand or from pulverized sandstone; an alkali to lower the melting...

5) quartz. The Columbia Encyclopedia, Sixth Edition. 2001
...Quartz may be transparent, translucent, or opaque; it may be colorless or colored. Varieties are classified as crystalline and cryptocrystalline. Crystalline varieties...

6) eyeglasses. The Columbia Encyclopedia, Sixth Edition. 2001
...Eyeglasses usually consist of a pair of lenses mounted in a frame to hold them in position before the eyes. The first device of this kind was probably invented by...

7) Islamic art and architecture. The Columbia Encyclopedia, Sixth Edition. 2001
...Islamic art and architecture, works of art and architecture created in countries where Islam has been dominant and embodying Muslim precepts in its themes. 1 BackgroundIn...

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