Stromatolite (stromatolitic limestone/dolostone) — sedimentary Identification & Properties | Geo-Gem
Stromatolite (stromatolitic limestone/dolostone) is a sedimentary. 1) Acid test: Apply a drop of cold 10% HCl—calcitic stromatolite will fizz vigorously; dolomitic will react weakly unless powdered. 2) Scratch test: hardness around 3–4; should not scratch glass but will be scratched by a steel nail. 3) Ex…