Which set of optical properties best describes quartz? (might be multi-choice)

[answerhappygod]

Which set of optical properties best describes quartz? (might be multi-choice)
Classification of felsic rocks Q 80 quartz-rich granitoid 60 total felsic minerals Volume % of quartz in alkali granite granite 40 granodiorite quartz alkali tonalite quartz diorite syenite 20 20 alkali quartz quartz quartz syenite syenite monzonite monzodiorite diorite 1 syenite 5 monzonite monzodiante А 10 35 65 90 Alkali feldspar Volume % plagioclase in overall feldspar content Plagioclase Classification of mafic rocks plag plagioclase olivine 10 65 ор 90 anorthosite troctolle (clinopyroxene troctolite) cox afic rock witramatic rocks see Fig. 5.1 ollvine gabbro Ex B2 2000 gabbrononite abbro clinopyroxene orthopyroxene norite gabbro 10 plagioclase-bearing pyroxenite orthopyroxene clinopyroxene