| 释义 |
sanidine Min.|ˈsænɪdiːn|
[a. G. sanidin (K. W. Nose 1808), f. Gr. σανιδ-, σανίς board: see -ine5.]
A glassy variety of orthoclase, found in flat crystals (Chester).
1815Aikin Man. Min. (ed. 2) 197 Glassy Felspar. Sanidin. 1849J. Nicol Man. Min. 121 The glassy felspar or sanadine is by some considered a distinct species. 1867Brande & Cox Dict. Sci., etc., Sanidine,..a name given to Glassy Felspar, on account of the tabular form of its crystals.
Hence saniˈdinic a., containing sanidine. ˈsanidinite, a rock consisting largely of sanidine.
1885Encycl. Brit. XVIII. 748/2 Modern volcanic rocks (quartzose trachyte, amphiboliferous and sanidinic trachyte). 1887Mineral. Mag. VII. 227 The blocks of sanidinite and laacher-trachyte occur of all sizes up to masses measuring two feet in diameter... The sanidinite consists principally of sanidine, or of sanidine and nosean. 1916J. A. Thomson in David & Priestley Brit. Antarctic Exped. 1907–9: Geol. II. 139 Trachytes appear to have the power of converting inclusions of such rocks as older trachytes, gneisses and granulites into sanidinites. 1962N.Z. Jrnl. Geol. & Geophysics V. 395 The finest examples of sanidinites..were obtained from a zone of yellowish-green glass, in some places as much as half an inch in thickness, formed at the contact between porcellanite and overlying basalt. |