orthoclase
/ˈɔːθəʊkleɪs/noun
mass noun
- a common rock-forming mineral occurring typically as white or pink crystals. It is a potassium-rich alkali feldspar and is used in ceramics and glass-making正长石。
词源
mid 19th cent.: from ortho- 'straight' + Greek klasis 'breaking' (because of the characteristic two cleavages at right angles).