Field Observation: Siltstone with Carbonate Influence This siltstone outcrop displays light yellow banding; suggesting varying oxidation levels or subtle mineral layering within the formation. The rock is moderately soft breaks easily, and shows elevated calcium (Ca) on XRF testing ; pointing to carbonate cementation or partial calcitic replacement The exposure occurs along a dipping bed on the ridge, where erosion has partially uncovered the unit revealing interbedded pyroclastic materials. Int

Limestone is an important rock used to make many materials, including cement and glass. However, mining limestone is dangerous and difficult — miners risk their lives slicing the stone with razor-sharp blades. #limestone #mining #bigbusiness #insider | Insider