Rough Black Basalt / 1.5-2.5" AVG - 1 KILO LOT

Quantity: 1 kilogram

Average size range: 1.5 to 2.5 inches

Basalt is a fine-grained igneous rock that forms when lava rapidly cools and solidifies, and forms about 90% of all volcanic rock on Earth. Basalt is so common, in fact, that it can also be found on other planets with volcanic activity like Venus and Mars.