LOCATION:- PLEASANT RIDGE QUARRY - RENSSELAER INDIANA. As a result, the operation's quarry appearance was constantly changing because of the blasting that took place to bring down the walls. No matter what week-end you went, there was "fresh" hunting.
Although not easily seen because of the cleavage and sheets, fracture is uneven. It has a hardness of 2.5 to 3 Mohs, a specific gravity of 2.7 to 3.1, and an average density of 3.09 g/cm. It appears greenish reddish to brown or black, and even yellow when weathered.