Perforated sandstone pebble (hag stone/holed sandstone) — sedimentary Identification & Properties | Geo-Gem
Perforated sandstone pebble (hag stone/holed sandstone) is a sedimentary. 1) Scratch test: try to scratch a fresh surface with a steel knife—quartzose sandstone should resist and will scratch window glass. 2) Acid test: drop dilute HCl (10%) or household vinegar on a fresh spot; vigorous fizzing indicates limest…