Hornblende. It's found everywhere you can find igneous or metamorphic rocks.
Today I found a whole bunch while rock hounding in nature.
Here's a little bit about this underrated stone.
Hornblende is a powerful root chakra stone. Hornblende, also known as amphibolite, can help when your argumentative side takes over with friends or loved ones. It helps individuals to accept compromise so that all parties can attain resolution. It is a grounding stone and works well with other minerals and humans. Promotes unity and integration. Helps dissipate inner conflict and obsessive strain. Helps cope with contrasts by allowing each aspect its necessary space. Good for the small intestine and kidneys as well as for middle and inner ear problems. It emits a green healing energy. It can help to increase abundance and prosperity. It works well to heal the root chakra.