meaning of basalt rock
What is BASALT FIBER? What does BASALT FIBER mean? BASALT ...
Apr 22, 2017· Basalt fiber is a material made from extremely fine fibers of basalt, which is composed of the minerals plagioclase, pyroxene, and olivine....
How to Identify Basalt | Sciencing
How to Identify Basalt. Basalt, a volcanic igneous rock, occurs worldwide, but especially in India, Scotland, Greenland, Iceland, Canada and the northwestern United States. Most basalt occurs as lava flows, in narrow dykes or sills. It's the basalt from lava flows that make up the enormous sheets of a lava plateau. This rock is easy to identify....
Vesicular and Amygdaloidal Textures
(A secondary mineral is one that formed after the rock originally formed.) This is a fine example of a vesicular basalt. If you click on the picture to enlarge it, you will see tiny white 'laths' of plagioclase feldspar. This sample is thus vesicular, finegrained, and porphyritic....
Basalt and Granite
Basalt is commonly very fine grained, and it is nearly impossible to see individual minerals without magnification. Basalt is considered a mafic silicate rock. Among other characteristics, mafic minerals and rocks are generally dark in color and high in specific gravity. This is in large part due to the amount of iron, magnesium, and several other relatively heavy elements which "contaminate" the silica and ....
Rocks in Hand Specimen
Basalt lava (amygdaloidal) Amygdaloidal basalt. This is a basalt, a dark coloured volcanic rock formed from a magma of basic composition erupted on the Earth's surface. Magmas generally contain dissolved gas, which can form bubbles in the magma as the pressure is released on eruption. These bubbles can get trapped in the solidified rock....
Characteristics of Igneous Rocks ScienceStruck
The prime characteristics of igneous rocks used for identification purposes are color and size of crystals. Color of igneous rocks may be light or dark, whereas the crystal size is either small or large, based on how crystallization process takes place....
Basalt definition of basalt by The Free Dictionary
basalt the commonest type of solidified lava; a dense dark grey finegrained igneous rock that is composed chiefly of plagioclase feldspar and pyroxene. pyroxene any of a group of crystalline silicate mineral common in igneous and metamorphic rocks. oligoclase, plagioclase any of a series of triclinic feldspars that form rocks....
Rocks Information and Facts | National Geographic
Rocks are so common that most of us take them for granted—cursing when we hit them with the garden hoe or taking advantage of them to drive in tent pegs on summer camping trips. What Is a Rock?...
Chapter 4 Quiz Flashcards | Quizlet
What does it mean to have an andesitic composition? Rocks have a composition between that of granite and basalt. Rocks contain mostly olivine and pyroxene. Rocks contain mostly quartz. Rocks have the same composition as basalt. the size of the crystals....
Basalt Definition | History
Define Basalt. Basalt is one of the important type of rocks. If we have to define Basalt in general, Basalt is a common extrusive igneous rock formed by the rapid cooling of basaltic lava exposed at or very near the surface of Earth....
BASALT | meaning in the Cambridge English Dictionary
basalt definition: 1. a type of black rock that comes from a volcano 2. a type of black rock that comes from a volcano (= mountain that explodes and throws out hot rocks). Learn more....
Igneous Rocks For Kids | Cool Kid Facts
Igneous rocks are a word used for rocks that have formed by the cooling and hardening of molten lava or magma. The atoms and molecules of melted minerals are what make up magma. These atoms and molecules rearrange themselves into cool mineral grains as the magma cools, forming rocks as the mineral grains grow together....
How to Write a Rock Description for Igneous, Sedimentary ...
How to Write a Rock Description for Igneous, Sedimentary and Metamorphic Rocks (Geology) Many of us, through our time at sixth form or university, have to go through the tedious process of writing a rock description. It is, let's be honest, not the most exciting thing to do yet not something you can often escape. ... meaning it is a quartzmica ......
Basalt an overview | ScienceDirect Topics
Basalt is an easily datable rock and thus is a handy tool when available. Basalt flows emanating from the Uinkaret field between the Hurricane and Toroweep faults spilled into the Grand Canyon as shown in Figure These basalts have been used to determine Colorado River incision rates....
Igneous Rocks: How Are They Formed? Universe Today
Dec 16, 2015· Basalt is a common form of extrusive igneous rock and forms lava flows, lava sheets and lava plateaus. Extrusive igneous rocks include andesite, basalt, obsidian, pumice, rhyolite, scoria, and ....
WTP: Earth: Mare Basalt
Mare Basalt. This igneous rock was collected from one of the darker areas on the moon known as mare. The mare formed billions of years ago. Large meteorites impacted the surface of the moon and broke up the crust. Later lavas formed by melting of rock within the moon due to ....
basalt definition and meaning
Curious varnished and painted vases, idols in basalt and skeletons were in it. Six Months in Mexico. The sand on Mars is from basalt, which is a darkish gray color. EXTRALIFE – By Scott Johnson Incredible picture of stuff on Mars. The youngest volcanic rock is Mt. Lidgbird basalt, which is present in lava flows up to 30 m thick....
Diabase Wikipedia
Diabase. Diabase ( /ˈdaɪ.əbeɪs/) or dolerite or microgabbro is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine grained to aphanitic chilled ....
Basalt dictionary definition | basalt defined
basalt definition: 1. a dark, finegrained, usually extrusive igneous rock that is more basic than andesite, consisting chiefly of plagioclase feldspars and pyroxene: often found in vast sheets, it is the most common extrusive igneous rock 2. a kind ......
A List of Extrusive Igneous Rocks | Sciencing
Oct 12, 2018· Basalt is an ironrich, very dark colored extrusive igneous rock. Basalt is very abundant beneath the ocean floor and is the most common volcanic rock in the Earth's crust. Basalt forms when the upper mantle melts. The low viscosity magma rises mostly along spreading centers to ....
basalt | Definition, Properties, Facts |
Basalt, extrusive igneous (volcanic) rock that is low in silica content, dark in color, and comparatively rich in iron and magnesium. Basalts may be broadly classified on a chemical and petrographic basis into two main groups: the tholeiitic and the alkali basalts....
basalt | Definition of basalt in English by Lexico ...
'Wedgwood's basalt, a hard, black, stonelike material known also as Egyptian ware or basaltes ware, was used for vases, candlesticks, and realistic busts of historical figures.' Origin Early 17th century (in the Latin form): from Latin basaltes (variant of basanites), from ....