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Basalt is a commonly extrusive volcanic rock. It is usually grey to black and fine-grained due to rapid cooling of lava at the surface of a planet. Unweathered basalt is black or grey. Basalt is defined as an igneous rock that contains less than 20% quartz and less than 10% feldspathoid and where at least 65% of the feldspar is in the form of plagioclase. On Earth, most basalt magmas have formed by decompression melting of the mantle. Basalt has also formed on Earth's Moon, Mars, Venus, and even on the asteroid Vesta. Basalt is being forming all the time from volcanic eruptions and activity.
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Is granite in basalt?
No. Granite and basalt have different compositions and form under different circumstances.
Can diamonds form in basalt?
No diamond cannot form in basalt. Diamond only form in Kimberlite because it develop only at very low cooling rate.
Did basalt form slow or quick?
Quick
Do basalt and rhyolite form magma?
No. Both basalt and rhyolite are formed from molten rock erupts from a volcano.
Do basalt plateaus form from explosive or quiet eruptions?
Quiet eruptions are a characteristic of basalt lava flows and plateaus.
Does basalt form most of the earths crust?
yes
Does igneous basalt form partly as the result of surface processes?
Yes. In that basalt is formed from rapid cooling of lava at or near the surface.
What makes basalt not a minerals?
Basalt consists of multiple minerals. Pyroxene, calcium-rich plagioclase, and sometimes olivine are key minerals in basalt. Basalt that cools rapidly may form glass, which contains no minerals because it lacks a crystal structure.
What type of lava form mount st Helen?
Basalt
Sandstone and basalt can be changed by heat pressure to form?
Sedimentary rocks
Sandstone and basalt are changed by heat and pressure to form?
metamorphic rocks
What is the first mineral to form when magma starts crystalizing at 1200C?
Basalt
