Agate is a form of microcrystaline quartz. It is usually formed in nodules and has transparent, or translucent portions. As with all of the other species in the quartz family, agate takes a high polish with cerium oxide, but also takes a fine polish with tin oxide and diamond. Mohs hardness 6.5 to 7.
Two piece parcel measures approximately:
Triangular shape 4-1/2" x 3-1/4" x 2-1/2" at a peak and
Triangular shape 5" x 3-1/2" x 1-1/2" at a peak
Weight: 3.25 lbs