| 释义 |
anorthoclase, n. Min.|ænˈɔːθəkleɪz|
[ad. G. Anorthoklas (coined in H. Rosenbusch Mikroskopische Physiographie der Mineralien u. Gesteine (1885) I. 550): see an- 10, orthoclase n.]
A triclinic sodium-rich alkali feldspar, (Na,K)AlSi3O8 , similar to microcline, occurring in many slightly alkalic lavas.
1888J. P. Iddings tr. Rosenbusch's Microsc. Physiogr. Rock-Making Minerals 311 The series of triclinic potash-soda feldspars..is to be designated as the series of anorthoclases in distinction to the plagioclases which plainly cleave obliquely. 1903A. Geikie Text-bk. Geol. (ed. 4) I. ii. 221 From a half to two-thirds of the rock consists of cryptoperthite (soda-orthoclase) and soda-microcline (anorthoclase of Rosenbusch). 1965G. J. Williams Econ. Geol. N.Z. xi. 167/2 Among these rocks is a tinguaite consisting of a network of aegirine crystals with phenocrysts of anorthoclase. 1993Jrnl. Geol. Soc. CL. 892 The phonolites contain ‹5{pcnt} of anorthoclase phenocrysts. |
