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Diabase (IPA: /ˈdʌɪəbeɪs/) is a mafic, holocrystalline, igneous rock equivalent to volcanic basalt or plutonic gabbro. Wikipedia does not have an article with this exact name. ... Dolerite (from the Greek word doleros meaning deceptive), in petrology is the name given by Hauy to those basaltic rocks which are comparatively coarse grained. ... For information on how to read IPA transcriptions of English words see here. ... In geology, mafic minerals and rocks are silicate minerals, magmas, and volcanic and intrusive igneous rocks that have relatively high concentrations of the heavier elements. ... Volcanic rock on North America Plutonic rock on North America Igneous rocks are formed when rock (magma) cools and solidifies, with or without crystallisation, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. ... This article is about volcanoes in geology. ... Basalt Columnar basalt at Sheepeater Cliff in Yellowstone Basalt (IPA: ) is a common gray to black volcanic rock. ... Devils Tower, an igneous intrusion exposed when the surrounding softer rock eroded away. ... Gabbro specimen. ...

Description

Diabase normally has a fine, but visible texture of euhedral lath shaped plagioclase crystals set in a finer matrix of pyroxene, typically augite, with minor olivine and magnetite. Accessory and alteration minerals include hornblende, biotite, apatite, pyrrhotite, chalcopyrite, serpentine, chlorite, and calcite. The texture is termed ophitic and is typical of diabases. The feldspar is high in anorthite (as opposed to albite), the calcium end member of the plagioclase Anorthite-Albite solid solution series, most commonly labradorite. Lunar Ferroan Anorthosite #60025 (Plagioclase Feldspar). ... Quartz crystal Copper(II) sulfate and iodine crystal Synthetic bismuth crystal Insulin crystals Gallium, a metal that easily forms large single crystals A huge monocrystal of potassium dihydrogen phosphate grown from solution by Saint-Gobain for the megajoule laser of CEA. In chemistry and mineralogy, a crystal is a solid... Figure 1:Mantle-peridotite xenolith with green peridot olivine and black pyroxene crystals from San Carlos Indian Reservation, Gila Co. ... Augite is a mineral described chemically as (Ca, Na)(Mg, Fe, Al)(Al, Si)2O6 or calcium sodium magnesium iron aluminium silicate. ... Olivine basalt The mineral olivine is a magnesium iron silicate with the formula (Mg,Fe)2SiO4. ... // Headline text Magnetite is a ferrimagnetic mineral form of iron(II,III) oxide, with chemical formula Fe3O4, one of several iron oxides and a member of the spinel group. ... Amphibole (Hornblende) Hornblende is a complex inosilicate series of minerals. ... A Biotite slice Biotite is a common phyllosilicate mineral that contains potassium, magnesium, iron and aluminium. ... ske| Fracture|| Conchoidal to even Apatite is a group of phosphate minerals, usually referring to hydroxylapatite, fluorapatite, and chlorapatite, named for high concentrations of OH-, F-, or Cl- ions, respectively, in the crystal. ... Pyrrhotite is an unusual iron sulfide mineral with a variable iron content: Fe(1-x)S (x = 0 to 0. ... Chalcopyrite (sometimes called peacock pyrite) is a copper iron sulfide mineral that crystallizes in the tetragonal system. ... Serpentine Serpentine is a group of common rock-forming hydrous magnesium iron phyllosilicate ((Mg, Fe)3Si2O5(OH)4) minerals; it is also often rich in other metal ores, including chromium, manganese, cobalt and nickel. ... This discusses some chlorine compounds. ... Doubly refracting Calcite from Iceberg claim, Dixon, New Mexico. ... Labradorite, a feldspar mineral, is a member of the plagioclase series. ...

Locations

Diabase is usually found in smaller relatively shallow intrusive bodies such as dikes and sills. Diabase dikes occur in regions of crustal extension and often occur in dike swarms of hundreds of individual dikes or sills radiating from a single volcanic center. A dike in geology refers to a tabular intrusive igneous body. ... In geology, a sill is a tabular, often horizontal mass of igneous rock that has been intruded laterally between older layers of sedimentary rock, beds of volcanic lava or tuff, or even along the direction of foliation in metamorphic rock. ...

Examples

The Palisades Sill which makes up the New Jersey Palisades on the Hudson River, near New York City, is an example of a diabase sill. The dike complexes of the Hebridean Tertiary volcanic province which includes Skye, Rum, Mull, and Arran of western Scotland, the Slieve Gullion region of Ireland, and extends across northern England contains many examples of diabase dike swarms. Diabase is also called dolerite in many older references. The Palisades Sill as seen from the Palisades Intersate Parkway. ... Palisades is also a general term for steep cliffs next to a river. ... The Hudson River, called Muh-he-kun-ne-tuk in Mahican, is a river running mainly through New York State but partly forming the boundary between the states of New York and New Jersey. ... Nickname: Big Apple, Gotham, NYC Location in the state of New York Coordinates: Country United States State New York Boroughs The Bronx Brooklyn Manhattan Queens Staten Island Settled 1613  - Mayor Michael Bloomberg (R) Area    - City 1,214. ... The Hebrides The Hebrides (Gaelic: Innse Gall) comprise a widespread and diverse archipelago off the west coast of Scotland, and in geological terms are composed of the oldest rocks in the British Isles. ... For other uses, see Tertiary (disambiguation). ... Motto: (Latin) No one provokes me with impunity1 Anthem: Multiple unofficial anthems Capital Edinburgh Largest city Glasgow Official language(s) English, Gaelic, Scots2 Government  - Queen Queen Elizabeth II  - UK Prime Minister Tony Blair MP  - First Minister Jack McConnell MSP Unification    - by Kenneth I 843  Area    - Total 78,772 km... Slieve Gullion (Irish: Sliabh Cuilinn) is a mountain in the Cooley Mountains. ... Motto: (French for God and my right) Anthem: God Save the King/Queen Capital London (de facto) Largest city London Official language(s) English (de facto) Unification    - by Athelstan AD 927  Area    - Total 130,395 km² (1st in UK)   50,346 sq mi  Population    - 2006 est. ... Dolerite (from the Greek word doleros meaning deceptive), in petrology is the name given by Hauy to those basaltic rocks which are comparatively coarse grained. ...

During seven centuries a diabase formation called Runamo was famous in Scandinavia as a runic inscription, until it became the object of a famous scientific controversy in the first half of the 19th century. Jens Jacob Asmussen Worsaaes illustration of a part of the inscription. ... Scandinavia is a historical and geographical region centered on the Scandinavian Peninsula in Northern Europe. ... Technical note: Due to technical limitations, some web browsers may not display some special characters in this article. ... Alternative meaning: Nineteenth Century (periodical) (18th century — 19th century — 20th century — more centuries) As a means of recording the passage of time, the 19th century was that century which lasted from 1801-1900 in the sense of the Gregorian calendar. ...