Agate, amethyst, carnelian, and bloodstone are all types of what gemstone?

Behind feldspar, quartz is the second-most abundant mineral in Earth's continental crust, and it has many varieties. Everything from flint to rose quartz to citrine to onyx and more is a variety of quartz, which makes it among the most beloved and common gemstones in the world.

Asked by Ben Jenkins · Last updated 2 years ago · 17.2K views