WMQSample|Take the quiz|Please enter your Full Name:|Your Email Address:|Your ID Number or Password:|Name one of the two essential minerals in granite # olivine %% quartz %% plagioclase %% muscovite %%|What mineral commonly forms pyritohedrons # quartz %% pyrite %% graphite %% K-spar %%|The most common mineral in quartzite is # quartz %% diamond %% muscovite %% amethyst %%|Which mineral has no cleavage? # diamond %% graphite %% pyrite %% galena %%|Which mineral has four perfect cleavages? # talc %% corundum %% calcite %% fluorite %%