feldspathic sandstone meaning in English

长石砂岩
长石质砂岩

Preliminary tests and study on construction methods of building dams on feldspathic sandstone
砒砂岩筑坝施工方法初步试验研究
The feldspathic sandstones belong to this formation of composite sources metamorphic , sedimentary , and igneous sources , but mainly from metamorphic source due to the high abundance of brown cl colors of quartz
上述情况表明，研究区长石砂岩物源母岩包括变质岩、沉积岩与火成岩，但从发育大量棕色石英颗粒来看，物源以变质岩为主。