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quartz
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Quartz. Rose quartz. A sample of amethyst, trigonal silicon oxide, from Amatitlán, Guerrero, Mex. quartz with hematite inclusions quartz Boudinage granite Quartz agates from Mexico. rose quartz smoky quartz
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Photos and Videos

Quartz.
Rose quartz.
A sample of amethyst, trigonal silicon oxide, from Amatitlán, Guerrero, Mex.
quartz with hematite inclusions
quartz
Boudinage
granite
Quartz agates from Mexico.
rose quartz
smoky quartz
Learn about sands, which are formed from quartz and also the formation of smooth, sandy beaches
Learn about the mining and purification of silicon
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Quiz
Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.
(Bed) Rocks and (Flint) Stones