Agate is a type of microcrystalline quartz that is characterised by its fine grain and vibrant colours. Agate is known for its banded appearance, with alternating layers of different colours and ...

Black onyx is a type of chalcedony, which is a form of microcrystalline quartz. It is known for its smooth, glossy, and solid ...

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.

In most soils, feldspars, micas, and quartz are the main primary mineral constituents, and pyroxenes and hornblendes are present in smaller amounts.