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).
| 1815 Aikin Man. Min. (ed. 2) 197 Glassy Felspar. Sanidin. 1849 J. Nicol Man. Min. 121 The glassy felspar or sanadine is by some considered a distinct species. 1867 Brande & 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.
| 1885 Encycl. Brit. XVIII. 748/2 Modern volcanic rocks (quartzose trachyte, amphiboliferous and sanidinic trachyte). 1887 Mineral. 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. 1916 J. 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. 1962 N.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. |