A rock of igneous origin, consisting of augite and triclinic feldspar, with grains of magnetic or titanic iron, and also bottle-green particles of olivine frequently disseminated.
An imitation, in pottery, of natural basalt; a kind of black porcelain.
A fine-grained igneous rock composed of calcium-rich plagioclase feldspar and pyroxene, with lesser amounts of olivine and amphibole. Basalt is the most common type of volcanic rock in the earth's crust, and makes up the upper layers of the oceanic crust.
A fine-grained, heavy igneous rock. Usually a greenish black color, but sometimes dull brown or black. Basalt is often used to make axes and other groundstone tools.
A dense uniform black stoneware developed and made by Wedgwood.
Dark igneous rock in lava flow.
An igneous rock forms when magma emerges onto the earth's surface and cools rapidly.
A dark colored aphanitic (fine grained) igneous rock (volcanic rock). Contains mainly plagioclase, pyroxene, and olivine.
a fine-grained volcanic rock used for the manufacture of chipped stone artifacts. Color black to gray, texture granular to glass-like.
A dark grained to black, dense to fine-grained igneous rock, consisting of plagioclase feldspar (usually labradorite), augite, olivine, and usually magnetite. Some glass may be present. This is one of the type of rock which are referred to by the word "trap."
Dark colored, fine grained volcanic rock which is commonly called lava. Basaltic lavas are generally very fluid.
are volcanic rocks primarily composed of the minerals olivine, pyroxene and feldspar.
a volcanic igneous rock that is low in silica (40-50%), and high in Fe and Mg. It is produced by partial melting of the mantle, and forms the bulk of the oceanic crust and may also occur in continenetal environments.
A type of igneous igneous rock with a basic composition. Strictly the term is used only for lavas, erupted at the earth's surface. However, many geologists also use it for basic igneous rocks intruded at high levels in the crust (intrusive basalt is strictly called dolerite).
A fine-grained mafic igneous rock.
Basalt - A finely crystalline, basic igneous rock, consisting of mostly labradorite feldspar, pyroxene, and fine-grained olivine.
A general term for dark, mafic igneous rocks, commonly exstrusive but locally intrusive. Basalts are composed chiefly of calcium rich plagioclase and clinopyroxene. A basalt is the fine grained equivalent of a gabbro.
A dark colored, hard, volcanic rock containing 45% to 54% silica rich minerals (SiO2) which results in low viscosity (resistance to flow). Basalt is erupted at temperatures between 2012 °F and 2282 °F. Common minerals in basalt include olivine, pyroxene, and plagioclase.
A dark volcanic rock rich in iron and magnesium minerals. Basalt is the most common volcanic rock on earth.
A common type of fine-grained, volcanic rock, composed primarily of the minerals pyroxene and plagioclase.
A volcanic rock consisting of less than 53% silica with a low viscosity when in a molten state.
(ba salt') - A volcanic igneous rock made principally of pyroxene and plagioclase.
A dark volcanic rock, found in various forms.
Black extrusive igneous rock with fine crystals.
Igneous rock, composed primarily of silicon, oxygen, iron, aluminum, and magnesium produced by the cooling of lava. Basalts make up most of Earth's oceanic crust and are also found on other planets that have experienced extensive volcanic activity.
Dark-gray, orange-to brown-weathering, fine-grained, extrusive igneous rock, commonly fractured (jointed), containing calcium-plagioclase and pyroxene; occurs as lava flows in the Central Lowlands; locally known as traprock. Basalt is extensively quarried for use as crushed stone.
A dense, silica poor, iron and magnesium rich, usually dark colored igneous rock which constitutes the majority of the outer mantle of the earth's interior and forms the oceanic crust. The dark gray or black lava erupted by volcanoes is usually a type of basalt. Back
Figure Basalt is a rock that is very fine-grained (often the grains are not visible) and contains dark ferromagnesian minerals (such as pyroxene) and calcic plagioclase (a feldspar). It is usually extrusive (solidifying from magma) or occasionally intrusive in narrow dikes.
A black fine-grained, basic igneous rock, commonly forming lava flows and consisting of iron oxide and silicate minerals including feldspar and pyroxene.
any fine crystalline black igneous rock.
Basalts are dark colored rocks formed by the rapid cooling and hardening of lava flows.
A type of dark gray rock formed by solidification of molten material. The rocks of Hawaii are basalts.
Dark coloured, fine grained volcanic rock composed of olivine, pyroxene and feldspar. No free quartz.
A dense textured (aphanitic) igneous rock relatively high in iron and magnesia minerals and relatively low in silica, generally dark gray to black, and feldspathic. A general term in contradistinction to felsite, a light-colored feldspathic and highly siliceous rock of similar texture and origin.
Dark-colored, fine-grained volcanic rock. It is low viscosity (less than 53 percent SiO2), relatively fluid when molten thus eruptions are generally nonexplosive.
A dark colored igneous rock commonly extrusive and composed primarily of calcic plagioclase and pyroxene also known as the fine grained equivalent of gabbro.
general term for dark-colored mafic igneous rock, usually extrusive, containing less than 52 weight percent silica
the commonest type of solidified lava; a dense dark gray fine-grained igneous rock composed chiefly of calcium-rich plagioclase feldspar and pyroxene
an example of an intrusive rock
One of the most volcanic rocks, on land it occurs in many cinder cones, lava flows, shield volcanoes and volcanic plateaux. The bulk of the ocean floors is formed by basalt.
Fine grained, dark-coloured igneous rock. Usually flows over the surface as a lava before consolidating.
Rock. A hard, fine-grained, dark (black), igneous rock that results from the rapid cooling of magma. Basalt often forms the cap on a butte; sometimes cracks to form columnar blocks.
An igneous rock that that is black or gray in color and makes up most of the ocean floor.
A fine-grained, dense, igneous rock, but unlike granites contains little or no quartz or feldspars. The colors of basalts are very dark green to black and often sold as granites.
A fine grained basic igneous rock which is erupted through volcanic activity.
a type of rock that forms from hardened lava.
Heavy, dark-colored rock that has cooled from molten material, that may occur in or on the earth's surface (intrusive or extrusive mafic igneous rock).
A hard, fine-grained, unglazed black stoneware perfected by Josiah Wedgwood.
Volcanic rock that contains between 47 and 52 weight percent silica. Basalts are typically black and commonly contain visible crystals of olivine and plagioclase (Figure 5).
A fine-grained igneous rock, usually volcanic (extrusive).
A dark-coloured, fine-grained, extrusive igneous rock composed of plagioclase feldspar, pyroxene and magnetite, with or without olivine.
Volcanic rock (or lava) that characteristically is dark in color, contains 45% to 54% silica, and generally is rich in iron and magnesium.
A dark-colored, extrusive igneous rock.
A fine-grained igneous rock — the most abundant type of lava.
A type of rock resulting from the cooling of lava.
Volcanic rock caused by partial melting of the Earth's crust.
Dark, porous, fine-grained, extrusive igneous rock. It is rich in iron and magnesium. Typically forms "lava flows" in parts of northern Utah and southern Idaho (Image) (Image).
a fine-grained dark basic igneous rock consisting of plagioclase feldspar, a pyroxene, and olivine: the most common volcanic rock and usually extrusive
Black stoneware with a smooth, stone-like finish; perfected by Josiah Wedgewood
an extrusive (reaches the surface to cool) rock of volcanic origin. It is fine grained, dark colored igneous rock composed primarily of calcic (calcium) plagioclase pyroxene.
A dark-coloured, fine-grained volcanic rock composed of feldspar, pyroxene and sometimes olivine; it is the volcanic equivalent of diabase and gabbro.
Dark, tough fine-grained to dense, extrusive volcanic rock, which commonly occurs in sheetlike lava flows.
A dark, fine grained volcanic rock. Very common.
dark colored, fine-grained volcanic igneous rock
Fine-grained, dark-colored igneous rock composed primarily of plagioclase feldspar and pyroxene and other minerals.
(3) fine-grained, dark-colored igneous rocks that are either intrusive or extrusive.
A dark igneous rock. Basalt originates from lava that has extruded onto the surface of the Earth. Therefore the lava has cooled quickly, forming small crystals.
a dark colored igneous (lava) rock. Basalt is differentiated from other igneous rocks by its chemical composition. The basalt of the Eastern Snake River Plain is thought to have intermittently flowed from numerous vents across the Plain over long periods of time.
A dark-colored fine-grained extruded volcanic rock, rich in iron and magnesium, that is chiefly composed of plagioclase and pyroxene.
The most abundant volcanic rock on Earth. Basalt contains about 50 percent silica. Most basalt erupts to form black lava flows. Block and ash flow – one type of pyroclastic flow where the fragments carried by the flow are mostly dense blocks of lava.
A dark-colored volcanic rock composed of calcium feldspar and pyroxene, and in some cases, olivine.
An extrusive volcanic rock composed primarily of plagioclase, pyroxene and some olivine.
A dense dark building stone composed of various compounds of augite, plagioclase, and magnetite.
a dark, fine grained igneous rock that has a composition that is low in silica; basaltic is to have the properties of a basalt
lava poor in silica ( basic). Basalt is less viscous than most other lavas and therefore flows freely and spreads over large areas when erupted on land. Such lavas are found in Antrim (the Giant's Causeway) and the Inner Hebrides in Britain. Basalt and related rocks form the oceanic crust.
Fine-grained igneous rock(rick in mafic minerals) that has erupted onto the surface
A dark, fine grained extrusive igneous rock, composed of feldspar and iron and magnesium rich minerals.
A hard, dense, dark, volcanic rock used extensively as a paving stone and occasionally as a building stone.
Typically a volcanic rock, although may also be the result of relatively shallow magma intrusions. Dark colored, fine-grained, and composed primarily of the feldspar mineral Calcic Plagioclase and the amphibole mineral Pyroxene. Basalt is most often associated with ocean crust volcanics like Hawai'i, but also often occurs on continents, sometimes as great layered flows like the Columbia River Basalts.
a type of hard, unglazed, black stoneware that is uniformly and densely grained.
a dark coloured igneous rock erupted from volcanoes and fissures on the Earth's surface. Flows of basalt cover 70% of the Earth's surface, and large areas of the surfaces of the other terrestrial planets, so it is a very important crustal rock. It is produced by the partial melting of rocks deep inside the Earth's mantle.
an extrusive igneous rock rich in magnesium and iron minerals, which give it strong magnetic properties;
Developed by Wedgwood around 1768 this refers to very hard, unglazed stoneware stained with cobalt and manganese oxides.
Highly mafic igneous volcanic rock, typically fine-grained and dark in color; rough volcanic equivalent of gabbro.
a hard, dense, dark volcanic rock composed chiefly of plagioclase, pyroxene, and olivine and often having a glassy appearance, one of the most abundant forms of igneous rock on earth with more than 90% of all volcanic rock and 90% of basic igneous rock being basalt - BACK
A dark, dense volcanic rock, about 50 percent of which is silica.
basic volcanic rock, melanocratic, with a microlitic or porphyritic texture, composed of calcic plagioclase (andesine/labrador), or pyroxene (augite) in a cryptofelsitic groundmass. In the paleovolcanites this groundmass contains secondary minerals (chlorite, epidote and opaque minerals).
Dark, igneous rock characteristic of solidified lava.
A dark volcanic rock, often with a glassy appearance, composed chiefly of plagioclase, pyroxene, and olivine.
a dark-colored, fine-grained, igneous rock formed from molten rock that flowed onto the Earth's surface.
outcropping rocks of high heavy metal and zeolite content comprising the coastal hills of Cos. Antrim and Londonderry; drainage waters and derivative soils are of high base status.
A type of tough volcanic rock that makes up most of the ocean's basins, mid-ocean ridges, and plates.
A dark igneous* volcanic rock composed of primarily two minerals: plagioclase and pyroxene. Over a period of 11 million years (17 to 6 million years B.P.) hundreds of flows of Columbia River basalt were extruded from long, linear vents in southeastern Washington, northeastern Oregon and west-central Idaho and traveled for hundreds of miles before cooling and solidifying to form the Columbia Plateau.
A fine grained, extrusive igneous rock. Typically contains 45-52% Sio2 by weight.
A dark, volcanic rock rich in iron and magnesium and usually quite fluid in the molten state [LCOTE
A fine-grained, mafic volcanic rock consisting mainly of the minerals plagioclase, olivine, and pyroxene
A very common, fine-grained, usually dark-coloured basic igneous rock.
A type of fluid magma with low silica content. Forms dark coloured rock (often red or black). Examples are the scoria cones of Auckland.
volcanic rock consisting mainly of labrador feldspar (plagioclase feldspar rich in calcium) and frequently including pyroxenes and magnetite (normally without or with very little quartz)
A general term for dark-colored, igneous rocks composed of minerals that are relatively rich in iron and magnesium.
An igneous rock of volcanic origin.
A dark colored fine grained igneous rock formed from mafic magma.
A black clay body developed by Josiah Wedgewood in the 1700's to immatate classical pottery.
A fine grained igneous rock forming lava flows or minor intrusions. It is composed of plagioclase, augite and magnetite, olivine may be present.
Dark, dense, aphanitic, extrusive rock that has a silica content of 40% to 50% and makes up most of the ocean floor. Basalt is the most abundant volcanic rock in the Earth's crust.
Basalt is a type of volcanic (igneous) rock. This hard, dark rock is composed of 45 to 54 percent silica (SiO2) and is often rich in iron and magnesium. Basalt is the most common type of rock in the Earth's crust - most of the sea floor is made up of basalt. Basalt forms when lava cools on the surface (whe then same type of lave cools below the surface, gabbro is formed).
A dark, fine-grained igneous rock formed by cooling of iron- and magnesium-rich lava above the surface of the earth. Basalt is the main component of the oceanic crust of the earth.
A fine-grained, sometimes glassy basic igneous rock
A fine-grained igneous rock that solidifies from molten lava at the Earth's surface. It is usually black, due to the predominance of dark-colored minerals.
Basalt (IPA: ) is a common gray to black volcanic rock. It is usually fine-grained due to rapid cooling of lava on the Earth's surface. It may be porphyritic containing larger crystals in a fine matrix, or vesicular, or frothy scoria.