So... this would be a Sedimentary rock type, mostly containing Quartz and/or Feldspar. Sedimentary rocks are rocks contain mostly minerals, bits of other rocks, and fossils, they tend to be very soft and are the most common of rocks on the upper layers of the earth.
Other Sediments are; Slate, Limestone, Siltstone, Chert, Shale, Flint, etc.
Hope I was helpful.
