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Quartz
Quartz is the most abundant mineral. It is an essential component of granitic igneous rocks, of sedimentary rocks such as sandstone and chert and of metamorphic rocks such as quartzites.
Actinolite
Actinolite is a common member of the amphibole family. It typically forms during low-grade metamorphism of mafic igneous rocks (such as basalt and gabbro) or carbonate-rich rocks such as limey mudstones.
Acanthite
Acanthite is a low-temperature hydrothermal mineral. It can form from inversion of argentite, a mineral that forms in higher temperature hydrothermal deposits.
