Type of volcanic rock containing large porphyritic crystals of quartz From Wikipedia, the free encyclopedia ...

He found the quartz in the Hart's Range of Australia's Northern Territory over the summer. In a video posted on Instagram, Gundersen is seen digging up the quartz and pulling it out of the ground.

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The fossils of this rock sequence are commonly found in ancient Archean chert, a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz. 5. Western Australia’s ...