Chert (laminated, possibly silicified stromatolitic limestone) — sedimentary Identification & Properties | Geo-Gem
Chert (laminated, possibly silicified stromatolitic limestone) is a sedimentary. 1) Scratch test: Try to scratch the specimen on a glass plate; chert should scratch glass easily. A steel knife should not scratch it. 2) Acid test: Place a drop of cold dilute HCl or strong vinegar on a fresh surface—true chert will not r…