SCIENCE|natural and applied sciences|earth sciences
- gaineamh grianchloiche Tagairt Faomhadh an téarma seo mar chuid de Thionscadal Lex
- ga
- quartz sand
- en
- Nóta The most common constituent of sand, in inland continental settings and non-tropical coastal settings, is silica (silicon dioxide, or SiO2), usually in the form of quartz. Many sands, especially those found extensively in Southern Europe, have iron impurities within the quartz crystals of the sand, giving a deep yellow color. Quartz sand that is recently weathered from granite or gneiss quartz crystals will be angular. It is called grus in geology or sharp sand in the building trade where it is preferred for concrete, and in gardening where it is used as a soil amendment to loosen clay soils