Wednesday, 23 April 2025

Basalt

Basalt (pronounced /bəˈsɔːlt/, /ˈbæsɒlt/, /ˈbæsɔːlt/, or /ˈbeɪsɔːlt/) is a common extrusive igneous (volcanic) rock formed from the rapid cooling of basaltic lava exposed at or very near the surface of a planet or moon. Flood basalt describes the formation in a series of lava basalt flows.

Definition

By definition, basalt is an aphanitic (fine-grained) igneous rock with generally 45-55% silica (SiO₂) and less than 10% feldspathoid by volume, and where at least 65% of the rock is feldspar in the form of plagioclase. It is the most common volcanic rock type on Earth, being a key component of oceanic crust as well as the principal volcanic rock in many mid-oceanic islands, including Iceland, Réunion and the islands of Hawaii. Basalt commonly features a very fine-grained or glassy matrix interspersed with visible mineral grains. The average density is 3.0 gm/cm³.

Basalt is defined by its mineral content and texture, and physical descriptions without mineralogical context may be unreliable in some circumstances. Basalt is usually grey to black in colour, but rapidly weathers to brown or rust-red due to oxidation of its mafic (iron-rich) minerals into hematite and other iron oxides and hydroxides. Although usually characterized as "dark", basaltic rocks exhibit a wide range of shading due to regional geochemical processes. Due to weathering or high concentrations of plagioclase, some basalts can be quite light-coloured, superficially resembling andesite to untrained eyes. Basalt has a fine-grained mineral texture due to the molten rock cooling too quickly for large mineral crystals to grow; it is often porphyritic, containing larger crystals (phenocrysts) formed prior to the extrusion that brought the magma to the surface, embedded in a finer-grained matrix. These phenocrysts usually are of olivine or a calcium-rich plagioclase, which have the highest melting temperatures of the typical minerals that can crystallize from the melt.

This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Basalt

Latest News for: basalt

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PHOTOS: Midvalley gathers to celebrate Earth Day at Basalt River Park

Aspen Times 23 Apr 2025

A few hundred local school kids joined a smattering of adults on Tuesday afternoon for the Earth Day celebration held at Basalt River Park ... The Roaring Fork River is seen on Earth Day on Tuesday at Basalt River Park.Austin Colbert/The Aspen Times.

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Energy nonprofit to host electric vehicle demos at Basalt Earth Day event

Aspen Times 21 Apr 2025

At the upcoming Basalt Earth Day event on Tuesday, April 22, Clean Energy Economy for the Region, or CLEER, will be hosting an informative session and demonstration for electric vehicles.

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Basalt football stars Daniel, Hays headed to Division III ranks after joint signing

Post Independent 20 Apr 2025

Taylor Hays and William Daniel were rocks for the Basalt High School football team this past fall, guiding the Longhorns to an 11-1 record and a trip to the Class 2A state semifinals ... Basalt High ...

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Lady Spartan tennis beats Basalt, CSCS

The Mountain Mail 17 Apr 2025

The Salida High School girls’ tennis team had a good couple of days playing against Basalt and Colorado Springs Christian School April 14-15 at home, beating Basalt with a 7-0 sweep and CSCS 6-1 ... .

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Basalt Natural Dye Workshop transforms local ingredients, expectations

Aspen Times 17 Apr 2025

The workshop will take place at Rock Bottom Ranch in Basalt from 5.30 to 7.30 p.m. and will give adults the chance to tap into their inner kid and experiment with something novel ... “It’s really cool to get to see that again.” ... .

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Greek Graffito in Jordan’s Black Desert Illuminates Early Nomadic Christian Life

Greek City Times 16 Apr 2025

Discovered in 2010 by Rafe Harahsheh, the inscription on a basalt pebble reads, ...

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Citroen Basalt Dark Edition Launched: Top 5 Highlights

NDTV 15 Apr 2025

The Citroen Basalt Dark Edition was launched alongside the Dark Edition version of the C3 and the Aircross ... .

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New evidence uncovers origin of 'ghost-arc signatures' in global mid-ocean ridge basalts

Phys Dot Org 15 Apr 2025

Mid-ocean ridge basalts (MORBs), located far from subduction ...

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Basalt hosts Earth Day celebration

Aspen Times 13 Apr 2025

following a Basalt Elementary School parade at 2.30 p.m ... Basalt hopes to encourage its residents and commuters to use alternative transportation and clean energy for power with the goal of reducing greenhouse gas emissions.

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Basalt wildland fire quickly suppressed on Saturday afternoon

Aspen Times 12 Apr 2025

The Basalt Police Department and Roaring Fork Fire Rescue responded to a wildland fire on Saturday afternoon on Columbine Court ... .

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Basalt’s Salazar-Tedin signs with William Penn to continue soccer career

Aspen Times 11 Apr 2025

The Basalt High School senior was the star of a small signing ceremony on Monday where he inked to continue his soccer career at William Penn University.

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⁠Citroen C3, Aircross and Basalt Dark Editions launched, prices start at ₹8.38 lakh

Hindustan Times 11 Apr 2025

Bookings for the new Citroen Dark Editions are now open, and the first example of the Basalt Dark Edition was delivered to brand ambassador MS Dhoni ... ₹8.38 lakh" data-vars-story-id="101744354794975" > Citroen Basalt.

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Citroen Basalt, C3, and Aircross Dark Editions Launched: Check Price, Features

NDTV 10 Apr 2025

Citroen has now launched the Dark Editions of its popular lineup- C3, Aircross And Basalt. Check out the full story to learn more ... .

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Citroen launches meaner C3, Aircross, Basalt Dark Editions: Price difference, changes explained

The Times of India 10 Apr 2025

In India, blacked-out cars have started to gain popularity and making its entry in this category, Citroen India has launched the new Dark Editions of the C3, the C3 Aircross SUV, and the Basalt coupe-SUV.

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Basalt Town Council tables short-term rentals fee

Aspen Times 10 Apr 2025

Basalt Town Council is considering a resolution that could create a per-bedroom fee on short-term rentals within town limits ... “This move will not add rentals to the employee housing market,” said Brenda Wilde, a Basalt realtor.

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Latest News for: basalt

PHOTOS: Midvalley gathers to celebrate Earth Day at Basalt River Park

Energy nonprofit to host electric vehicle demos at Basalt Earth Day event

Basalt football stars Daniel, Hays headed to Division III ranks after joint signing

Lady Spartan tennis beats Basalt, CSCS

Basalt Natural Dye Workshop transforms local ingredients, expectations

Greek Graffito in Jordan’s Black Desert Illuminates Early Nomadic Christian Life

Citroen Basalt Dark Edition Launched: Top 5 Highlights

New evidence uncovers origin of 'ghost-arc signatures' in global mid-ocean ridge basalts

Basalt hosts Earth Day celebration

Basalt wildland fire quickly suppressed on Saturday afternoon

Basalt’s Salazar-Tedin signs with William Penn to continue soccer career

⁠Citroen C3, Aircross and Basalt Dark Editions launched, prices start at ₹8.38 lakh

Citroen Basalt, C3, and Aircross Dark Editions Launched: Check Price, Features

Citroen launches meaner C3, Aircross, Basalt Dark Editions: Price difference, changes explained

Basalt Town Council tables short-term rentals fee

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