Impure quartz is commonly referred to as "chalcedony" or "agate," depending on its specific characteristics and formation. These varieties contain impurities or inclusions that give them unique colors and patterns. Other terms like "smoky quartz" or "rose quartz" also refer to quartz with specific impurities that affect its appearance.
Yes, quartz is naturally occurring silica though it is often impure.
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during heat prusure and time it changers from quartz to smoky quartz
Quartz is a mineral not a rock. Fossils can be found associated with quartz in sedimentary rock not inside the quartz.
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The answr is agate
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Specific gravity of quartz > 2.65; variable 2.59-2.63 in impure varieties.
Each mineral has a unique composition and definite set of properties. Often an alternate may be found for some of these properties. For example there are many piezoelectric materials that will substitute for quartz in some applications.
An unhealthy or impure water supply is contaminated.
Recrystallized limestone is generally called marble. Recrystallized quartz sandstone is generally called quartzite. There is no such thing as quartz limestone.
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A strip or vein of quartz containing gold is called a "reef."
An impure substance can be called a mixture. It could be either heterogeneous mixture or homogeneous mixture.
Set of instruction which form a program gets changed during the course of execution by that instruction behave differently is called impure procedure
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Impure copper can be purified through a process called electrolysis, where an electric current is passed through a copper sulfate solution, causing pure copper to be deposited on the cathode. The impurities are left behind as sludge or dissolve into the solution.