phonolite

/fohn-l-ahyt/US // ˈfoʊn lˌaɪt //UK // (ˈfəʊnəˌlaɪt) //

辉绿岩,辉钼矿,辉绿石,声波石

Definitions

n.名词 noun

1
- : a fine-grained volcanic rock composed chiefly of alkali feldspar and nepheline, some varieties of which split into pieces that ring on being struck.

(c.) Phonolite (Clinkstone) is a trachytic rock, composed essentially of sanidine, nepheline, and augite or hornblende.
The rock is phonolite, and is divided into irregular columns.
The Wolf Rock is composed of phonolite, and it occurs largely in Auvergne.
At last we draw ourselves up a huge wedge of phonolite and find ourselves at the summit of the first peak.