| 释义 |
orthoclase Min.|ˈɔːθəkleɪs|
[mod. (Breithaupt, 1823) f. ortho- ‘straight, right’ + Gr. κλάσ-ις breaking, cleavage.]
Common or potash feldspar, a silicate of aluminium and potassium, occurring in crystals or masses of various colours, characterized by two cleavages at right angles to each other.
1849Nicol Min. 119 All orthoclase from trachyte contains soda along with the potash. 1863S. R. Graves Yacht. Cruise Baltic 142 The felspar of this quarry is of two kinds, orthoclase and oligoclase, in large masses, the former pink, and the latter quite white. 1900Sillman Min. 87 Ground orthoclase is extensively used as a glaze.
b. attrib. Consisting of or containing orthoclase.
1849Murchison Siluria i. (1867) 11 Four separate stages of orthoclase-gneiss. 1869Bristow tr. Figuier's World bef. Deluge ii. 33 Alongside these orthoclase crystals, quartz is implanted. 1881Geikie Geol. Sketches 219 The grains of which are mainly of pink cleavable orthoclase felspar. |