mattotcha, to Astronomy
@mattotcha@mastodon.social avatar
heronfoxphoto, to macrophotography

Currently a competitor in , is a form of silicon dioxide () with a trigonal system that, ideally, results in the growth of a hexagonal column with pointed ends, but nature rarely allows this, as this demonstrates.

Vote in at https://www.mineralcup.org/2023/campaigns/campaigns/round-2-match-2

Get a print of this image, or other merchandise, at

, , ,

heronfoxphoto, to macrophotography

is that has been colored , often due to inclusions of iron in the crystal.
The shows several small, partial , where the crystal comes to a point.

Get a print or other merchandise at https://heronfox.pixels.com/featured/macro-amethyst-surface-2-heron-and-fox.html

, , , , , ,

heronfoxphoto, to macrophotography

is a form of () in a trigonal crystal system.
Other forms of silicon dioxide exist, but quartz is probably one of the most common.
Other things can be included into the crystal, or the crystal structure can be deformed, both of which are forms of in the crystal.
Get a print or other merchandise at https://heronfox.pixels.com/featured/flaws-in-a-quartz-specimen-2-heron-and-fox.html

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