Uberaba agate from Brazil has an outer rind that is polished, (by nature) with colors of yellow/gold, clear/white, light blue, black/gray or reddish brown possible. In the rough, uberaba agate looks like a giant tumble stone. Slabs will have contrasting bands of agate, quartz with some containing dendrites. Five square inches per slab is considered one sample order. Stock 135s.