Answer: orthoclases

AnswerCrossword Clue
orthoclasesORTHOCLASE, common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other
orthoclasesA common rock-forming mineral occurring typically as white or pink crystals. It is a potassium-rich alkali feldspar and is used in ceramics and glassmaking