Stone Six is a quartzite stone from Kakanui, North Otago. The most common colour for this kind of quartzite in this area is yellow, though some have red in them and others, like this one, are mainly a more neutral gray.
As the University of Auckland geology website states: “Quartzite is a metamorphic rock formed when quartz-rich sandstone or chert has been exposed to high temperatures and pressures. Such conditions fuse the quartz grains together forming a dense, hard, equi-granular rock.” What I find fascinating with these quartzites is how small clear quartz crystals become apparent in the close-up photos.
Stone of the Day #7 is here.
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