| | Journal (article/letter/editorial) | org afalster@mainemineralmuseum.org Muzo-habit Quartz Zigras Mine, Garland County, Arkansas Q uartz...anorthite, constitutes 39 percent of the crust. Quartz at 12 percent is tied with potassium feldspar (microcline...K-feldspar plus quartz), whereas oceans are underlain by basalts (plagioclase plus pyroxene), so quartz can be...considered a signature mineral of the continents! Quartz occurrences are so numerous that they cannot be...featured twice: rutile-included quartz (Cook 1996) and crystallized rose quartz (Clifford 2012). To support |
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Pé da Serra farm, Joaquim Felício, Minas Gerais, Brazil