The surface is stony and rocky, with great accumulations of friable rock, broken up by frost weathering in the intensely cold climate occurring at such high elevations.
(Sheer cliffs are also abundant at Cornell, but the walls of our famous gorges are made of friable rock layers. Climbing them would be like trying to scale a stack of lawn chairs).
In the peridotite massifs, three kinds of asbestos were observed: mainly antigorite having an appearance of friable rock, which splits up into smaller fragments, chrysotile occurring as small (in the millimeter to centimeter range) veins in fresh rocks, and sometimes tremolite [Supplemental Material, Figure 3 (doi:10.1289/ehp.1002862)].
Hard rock is not suitable, although some of the more friable rocks can be pierced by steel piles.
Results indicated that the highest intercepts of the power relation between unit discharge and SSY were associated with sites underlain primarily by friable rocks (e.g., sedimentary formations).
Diatomaceous earth, also called Kieselguhr, light-coloured, porous, and friable sedimentary rock that is composed of the siliceous shells of diatoms, unicellular aquatic plants of microscopic size.
These results, combined with previous work, indicate that strong winds, hyper-aridity, exposure of friable Neogene strata, and ongoing rock deformation and uplift in the western Qaidam Basin have created an environment where wind, instead of water, is the dominant agent of erosion and sediment transport.
In contrast, at the Larderello geothermal endolithic sites, the rocks are more friable and crumbly, but neither opal nor alunite is present.
The upland villages of Provence all look like mini collapsed towers of Babel: yellowy, seemingly friable houses; old, tip-tilted, and coextensive with the rock they stand on – Brantes was no exception.
Tunnels are generally grouped in four broad categories, depending on the material through which they pass: soft ground, consisting of soil and very weak rock; hard rock; soft rock, such as shale, chalk, and friable sandstone; and subaqueous.
It comprises rocks like Basalt, Rhyolites, Dolerite/Basalt dyke, Laterite, Argillaceous limestone and clay containing nummulites and clay, friable sandstone, pebbly sandstone, the conglomerate which marked as one of the fluoride-rich areas in Mandvi, Surat due to the occurrence of various rock types including fluoride-bearing minerals.
