andesite

/an-duh-zahyt/US // ˈæn dəˌzaɪt //UK // (ˈændɪˌzaɪt) //

安山岩,安山石,安石岩,安塞岩

Definitions

n.名词 noun

1
- : a dark-colored volcanic rock composed essentially of plagioclase feldspar and one or more mafic minerals, as hornblende or biotite.

In the same flow hypersthene-andesite may occur in one portion, while in close proximity the lava is an augite-andesite.
It also surrounds olivine in this same rock, which is a hypersthene-andesite, the hornblende and olivine being only accessory.
On Crater Peak, and below on Gibraltar, hypersthene andesite occurs with considerable variation of color and texture.
The rocks thus extruded are mainly composed of dark, heavy basic material, such as basalt and andesite.
In the Breidden district are the barren Criggeon shales with ashes and flows of andesite.