The Miocene volcanic rocks are mostly andesite, basalt, and pyroclastic rocks.    From Wordnik.com.  [Santa Monica Mountains (Bailey)] Reference

These volcanoes develop from magma of basaltic to intermediate composition (andesite).    From Wordnik.com.  [Volcano] Reference

Miocene basalt, andesite, pyroclastic, and marine sedimentary rocks predominate in this subsection.    From Wordnik.com.  [Northern Channel Islands (Bailey)] Reference

Being in hard andesite rock from top to bottom, the ground does not swell and crowd upon the timbers.    From Wordnik.com.  [Scientific American Supplement, No. 508, September 26, 1885] Reference

Most of them are basaltic composite stratocones and andesite stratovolcanoes; some are shield volcanoes.    From Wordnik.com.  [Volcanoes of Kamchatka, Russian Federation] Reference

Basalt magma typically generates very little ash compared to other types (andesite, dacite, and rhyolite).    From Wordnik.com.  [volcanic ash hazards and ways to minimize them] Reference

Volcanic rocks throughout the protected areas are formed of basalts, andesite-basalts, andesites and andesite-dacites.    From Wordnik.com.  [Volcanoes of Kamchatka, Russian Federation] Reference

Two kilometers to the south lies Mount Ngauruhoe, a 2,290 m composite andesite cone of interleaved pyroclastic material and lava.    From Wordnik.com.  [Tongariro National Park, New Zealand] Reference

Mariette Verseveld provided valuable assistance in organizing the project deliverables and locating the appropriate source of the andesite.    From Wordnik.com.  [Interactive Dig Tiwanaku - Biographies] Reference

The clasts are almost all basaltic andesite in composition.    From Wordnik.com.  [ScienceBlogs Channel : Life Science] Reference

The andesite masses here in places attain a thickness of 2000 feet.    From Wordnik.com.  [The Lake of the Sky Lake Tahoe in the High Sierras of California and Nevada, its History, Indians, Discovery by Frémont, Legendary Lore, Various Namings, Physical Characteristics, Glacial Phenomena, Geology, Single Outlet, Automobile Routes, Historic Towns, Early Mining Excitements, Steamer Ride, Mineral Springs, Mountain and Lake Resorts, Trail and Camping Out Trips, Summer Residences, Fishing, Hunting, Flowers, Birds, Animals, Trees, and Chaparral, with a Full Account of the Tahoe National Forest, the Public Use of the Water of Lake Tahoe and Much Other Interesting Matter] Reference

Which is this - the eruption is coming through andesite, not basalt.    From Wordnik.com.  [The Guardian World News] Reference

A later series of small diorite or andesite dikes cut the ore bodies.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

The dolomite is cut by steeply dipping faults and narrow andesite dykes.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

LAV-137 intersected porphyritic andesite with two intervals of sulphide breccias.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

The mantos are hosted in an andesite that is in contact with the Cabeza de Vaca batholith.    From Wordnik.com.  [StreetInsider.com News Articles] Reference

In limestone or andesite replacements, as by gold or lead or copper, the radius must be less.    From Wordnik.com.  [Principles of Mining Valuation, Organization and Administration] Reference

The oldest rocks in the region are andesite porphyries that occur widely throughout the area.    From Wordnik.com.  [The Earth Times Online Newspaper] Reference

LAV-139 was drilled on Section 900NE and intersected mixed andesite, granodiorite and tonalite.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

The andesite hosting the interpreted mantos exhibit a moderate-strong positive magnetic signature.    From Wordnik.com.  [StreetInsider.com News Articles] Reference

First off, it looks like sediment (the muddy matrix) is mixed with magma (basaltic andesite clasts).    From Wordnik.com.  [ScienceBlogs Channel : Life Science] Reference

River near Helena, Montana, where they are supposed to have been derived from dikes of andesite rocks.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

Views of Castle Peak's andesite towers, the highest at 9,103 feet elevation, were obstructed by clouds.    From Wordnik.com.  [The Union - All Categories] Reference

LAV-134A and LAV-136 intersected variably altered andesite and diorite porphyry containing weak mineralization.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

In other spots, the matrix looks like it was squeezed into cracks and open spaces in the basaltic andesite clasts.    From Wordnik.com.  [ScienceBlogs Channel : Life Science] Reference

An examination of the stones which fell at Fort de France showed them to be of a variety of lava called hornblende and andesite.    From Wordnik.com.  [Complete Story of the San Francisco Horror] Reference

On the summits nearer to Tahoe the volcanic outflows were of andesite, a rough and porous rock of dark gray to dark brown color.    From Wordnik.com.  [The Lake of the Sky Lake Tahoe in the High Sierras of California and Nevada, its History, Indians, Discovery by Frémont, Legendary Lore, Various Namings, Physical Characteristics, Glacial Phenomena, Geology, Single Outlet, Automobile Routes, Historic Towns, Early Mining Excitements, Steamer Ride, Mineral Springs, Mountain and Lake Resorts, Trail and Camping Out Trips, Summer Residences, Fishing, Hunting, Flowers, Birds, Animals, Trees, and Chaparral, with a Full Account of the Tahoe National Forest, the Public Use of the Water of Lake Tahoe and Much Other Interesting Matter] Reference

"The andesite volcanoes were mainly located along the crest of the.    From Wordnik.com.  [The Lake of the Sky Lake Tahoe in the High Sierras of California and Nevada, its History, Indians, Discovery by Frémont, Legendary Lore, Various Namings, Physical Characteristics, Glacial Phenomena, Geology, Single Outlet, Automobile Routes, Historic Towns, Early Mining Excitements, Steamer Ride, Mineral Springs, Mountain and Lake Resorts, Trail and Camping Out Trips, Summer Residences, Fishing, Hunting, Flowers, Birds, Animals, Trees, and Chaparral, with a Full Account of the Tahoe National Forest, the Public Use of the Water of Lake Tahoe and Much Other Interesting Matter] Reference

It's all volcanic - andesite lava rather than basalt - and that makes it fairly unique. ".    From Wordnik.com.  [Newsvine - Get Smarter Here] Reference

Rubbing stone of andesite.    From Wordnik.com.  [Illustrated Catalogue of the Collections Obtained from the Indians of New Mexico in 1880 Second Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1880-81, Government Printing Office, Washington, 1883, pages 429-466] Reference

Basalt = magma, andesite = ash clouds.    From Wordnik.com.  [The Guardian World News] Reference

"Nothing but pure andesite.    From Wordnik.com.  [Space Prison] Reference