Minerals
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Banded calcite in vein (vertical)
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2023/04/230327-5.jpg?w=1500&ssl=1)
Travertine–banded calcite–in veins. Death Valley, California. (230327-5)
Download ImageMagnetite
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2020/12/201210-48.jpg?w=1500&ssl=1)
Magnetite, a highly magnetic iron oxide, shown stuck to a magnet (Fe304) (201210-48)
Download ImageStaurolite “cross” in schist (square)
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2018/07/180427-26.jpg?w=1500&ssl=1)
Staurolite crystals in schist. Photo is about 6cm across. (180427-26)
Download ImageSalts precipitated by evaporation of seawater
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2018/07/180714-33.jpg?w=1500&ssl=1)
Rings of salt left behind by evaporation of seawater in a small pool. (180714-33)
Download ImageOrpiment and Realgar
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2018/04/180325-75.jpg?w=1500&ssl=1)
Orpiment (yellow) and Realgar (red) –both arsenic sulfide minerals. Kameni volcano, Santorini, Greece. (180325-75)
Download ImageAragonite crystals (square)
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2018/03/180228-14.jpg?w=1500&ssl=1)
Branching aragonite crystals (calcium carbonate), formed by growing in an unconfined space such as a cave. Photo is about 15 cm across. (180228-14)
Download ImageApatite crystal in calcite (square)
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/11/161109-10F.jpg?w=1500&ssl=1)
Euhedral apatite (calcium phosphate) crystal in calcite 161109-10F)
Download Imagebiotite and muscovite micas
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/Min-04.jpg?w=1500&ssl=1)
Phyllosilicate minerals: biotite (black) and muscovite (white). Min-04
Download ImageEuhedral quartz crystals in vug
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/30-3599.jpg?w=1500&ssl=1)
Euhedral quartz crystals in cavity in quartz sandstone. (30-3599)
Download ImageDifferent colors of calcite crystals
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/30-3311.jpg?w=1500&ssl=1)
Depending on the impurity, calcite can take on a variety of colors. (30-3311)
Download ImageWhite asbestos: chrysotile (vertical)
![](https://i0.wp.com/geologypics.com/wp-content/uploads/2017/04/110610-11.jpg?w=1500&ssl=1)
White asbestos, (chrysotile, a magnesium silicate). Crystal is 1 cm across. (110610-11)
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