Minerals
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Banded calcite in vein (vertical)
Travertine–banded calcite–in veins. Death Valley, California. (230327-5)
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Magnetite
Magnetite, a highly magnetic iron oxide, shown stuck to a magnet (Fe304) (201210-48)
Download ImageStaurolite “cross” in schist (square)
Staurolite crystals in schist. Photo is about 6cm across. (180427-26)
Download ImageSalts precipitated by evaporation of seawater
Rings of salt left behind by evaporation of seawater in a small pool. (180714-33)
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Orpiment and Realgar
Orpiment (yellow) and Realgar (red) –both arsenic sulfide minerals. Kameni volcano, Santorini, Greece. (180325-75)
Download ImageAragonite crystals (square)
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)
Euhedral apatite (calcium phosphate) crystal in calcite 161109-10F)
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biotite and muscovite micas
Phyllosilicate minerals: biotite (black) and muscovite (white). Min-04
Download ImageEuhedral quartz crystals in vug
Euhedral quartz crystals in cavity in quartz sandstone. (30-3599)
Download ImageDifferent colors of calcite crystals
Depending on the impurity, calcite can take on a variety of colors. (30-3311)
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White asbestos: chrysotile (vertical)
White asbestos, (chrysotile, a magnesium silicate). Crystal is 1 cm across. (110610-11)
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