Quartz
Quartz (SiO2). A glassy or crystalline form of silicon dioxide. Many colored varieties are semiprecious stones. (From Grant and Hackh's Chemical Dictionary, 5th ed)
Year introduced: 1991(1975)1963-1964
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Subheadings:
Tree Number(s): D01.578.750.600, D01.650.550.825.600, D01.837.725.600
MeSH Unique ID: D011791
Registry Number: 14808-60-7