Lot of 19 shop crystal rocks specimens

Product Name: Lot of 19 shop crystal rocks specimens
Raw and cut slabs of crystal rocks. 1.5” shop to 3.75”. Beautiful specimens. I don't know much about what they are or where they originated. There are agates, quartz, obsidian…Many of the pieces were found under a Victorian house in Northern California the home was on land which had been on the edge of a old river/creek in the city of sutter creek. It appears as if someone who lived in the home was a collector and a rockhound… part of the earth had been excavated … there were rock cutting tools and there were many specimens and rock formations and rock walls and Native American tools.