Igneous Rocks

noun a dark-colored fine-grained volcanic rock

• The basalt formations in the area are a result of ancient volcanic activity.
• Check out the cool basalt rocks over there.
• Those basalt cliffs are lit!
• His heart felt as heavy and solid as basalt.

noun a type of mineral that belongs to the group of crinoids, marine animals related to starfish and sea urchins

• Actinocrinite is a type of mineral that forms in radiating clusters of needle-like crystals.
• I found a cool piece of actinocrinite while hiking in the mountains.
• Check out this funky actinocrinite I scored at the gem show!
• The actinocrinite crystals seemed to glow with an otherworldly energy.