andesite

Definitions

  • WordNet 3.6
    • n andesite a dark grey volcanic rock
    • ***
Webster's Revised Unabridged Dictionary
    • n Andesite (Min) An eruptive rock allied to trachyte, consisting essentially of a triclinic feldspar, with pyroxene, hornblende, or hypersthene.
    • ***
Century Dictionary and Cyclopedia
    • n andesite A volcanic rock of wide-spread occurrence, especially in the Cordilleran region of North America. It consists essentially of a mixture of a triclinic feldspar with either hornblende or augite. Those varieties containing the former are called hornblende andesite, the latter augite andesite. There are also varieties of andesite which contain a considerable percentage of quartz. The line of separation between the basalts and rocks called by many lithologists andesite cannot be sharply drawn. See basalt.
    • ***

Usage

In literature:

On the summits nearer to Tahoe the volcanic outflows were of andesite, a rough and porous rock of dark gray to dark brown color.
"The Lake of the Sky" by George Wharton James
Being in hard andesite rock from top to bottom, the ground does not swell and crowd upon the timbers.
"Scientific American Supplement, No. 508, September 26, 1885" by Various
Surface eruption of quartz-porphyry, rhyolite, and andesite.
"History and Comprehensive Description of Loudoun County, Virginia" by James W. Head
Rubbing stone of andesite.
"Illustrated Catalogue of the Collections Obtained from the Indians of New Mexico in 1880" by James Stevenson
An examination of the stones which fell at Fort de France showed them to be of a variety of lava called hornblende and andesite.
"Complete Story of the San Francisco Horror" by Richard Linthicum
In limestone or andesite replacements, as by gold or lead or copper, the radius must be less.
"Principles of Mining" by Herbert C. Hoover
The lavas and ashes which form these cones are mostly andesitic.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2" by Various
A later series of small diorite or andesite dikes cut the ore bodies.
"The Economic Aspect of Geology" by C. K. Leith
The rocks are liparites, dacites, hornblende and pyroxene andesites.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 2" by Various
In the Breidden district are the barren Criggeon shales with ashes and flows of andesite.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3" by Various
***

In news:

According to Jim Howle, a hydrologist/geologist with the US Geological Survey, a 2 million-year-old pinkish porphyritic andesite used in North Shore houses came from volcanic flows from Mount Watson near Tahoe City.
Yesterday (Aug 2) at approximately 11:50 pm an ATV crash was reported on Andesite Road in the Yellowstone Club at Big Sky .
***

In science:

Earth is the only planet, in our solar system, that has both liquid water and a topographically bimodal crust, consisting of low-lying higher-density basaltic oceanic crust (OC) and high-standing lower-density andesitic continental crust (CC) (Rudnick and Fountain, 1995).
Geo-neutrinos and Earth's interior
***