Rhyolite is a type of rock that is the product of volcanic eruptions.

It is silica-rich and often made up of a combination of quartz, plagioclase, and sanidine. It typically has a fine-grained texture, meaning that the minerals which make up the stone are difficult to see with the naked eye.

Comes in a variety of light colors, with the most common being pink or gray.

During pre-contact times, rhyolite was mined extensively in eastern Pennsylvania and traded throughout Delaware, Maryland, and eastern Virginia.

Often, it was used to make spear points and arrowheads due to it being able to be kept sharp.