sanidine

/san-i-deen, -din/US // ˈsæn ɪˌdin, -dɪn //UK // (ˈsænɪˌdiːn, -dɪn) //

萨尼丁,桑尼迪,桑尼丁,桑尼德

Definitions

n.名词 noun

1
Mineralogy.
- : a glassy, often transparent variety of orthoclase in which sodium may replace as much as 50 percent of the potassium: forms phenocrysts in some igneous rocks.

All the upper part of the mountain is composed of a pumiceous tufa, rich in sanidine and of a characteristic greenish colour.
Sanidine, san′i-din, n. a clear glassy variety of orthoclase.
It is remarkable for the large crystals of sanidine (glassy felspar) which it contains, and has a rude columnar structure.
(c.) Phonolite (Clinkstone) is a trachytic rock, composed essentially of sanidine, nepheline, and augite or hornblende.
Trachyte from Hungary; felsitic paste with crystals of hornblende and sanidine, and a little magnetite.