'Brownstone is a variety of this rock, formed when grains of quartz & other minerals are bound together'
sandstone
ROCK: Brownstone is a variety of this rock, formed when grains of quartz & other minerals are bound together
Brownstone is a variety of this rock, formed when grains of quartz & other minerals are bound together
Brownstone is a variety of this rock, formed when grains of quartz & other minerals are bound together
ROCK
sandstone
ROCK