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Andesite typically has a groundmass ~ 50% of grains <.25mm of metallic oxides and quartz interspersed with larger phenocrysts of pyroxene and plagioclase feldspar. Other accesory minerals may be present.

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Why do andesite have small crystals?

Andesite is an Igneous Rock. It has small crystals because it cooled quickly d;D


Andesite has small crystals because?

Andesite has small crystals because it formed from lava that cooled relatively quickly at the Earth's surface, preventing larger crystals from growing. Rapid cooling does not allow enough time for the minerals to crystallize fully, resulting in smaller crystal sizes.


Is andesite nonfoliated?

Andesite is typically classified as an igneous rock, specifically a volcanic rock, and is not categorized as either foliated or nonfoliated since those terms primarily apply to metamorphic rocks. Foliation refers to the alignment of mineral grains under pressure, which is not relevant to andesite. Instead, andesite has a fine-grained texture and can contain a mix of minerals, but it lacks the layered or banded appearance characteristic of foliated rocks.


Does pumice have small grains?

No. Pumice does not have grains.


Is andesite sandstone?

No. Andesite is a volcanic rock.


What is a extrusive igneuse rock?

Extrusive igneous rocks are formed when lava cools and solidifies quickly on or near the Earth's surface. Due to the rapid cooling, extrusive rocks typically have small mineral grains or a glassy texture. Common examples include basalt, andesite, and rhyolite.


How old is andesite?

Andesite is not any age in particular. Some deposites of andesite may be hundreds of millions of years old. However, since andesite is volcanic, some andesite rocks may only be minutes old.


Is andesite a mineral?

No. Andesite is an extrusive igneous rock.


What are porphyritic rocks?

Porphyritic Rocks are rocks that have big and small crystal's like the Igneous Rock "Andesite".


Is andesite plutonic?

No. It is volcanic. The plutonic equivalent of andesite is diorite.


Is Andesite an igneous?

Yes. Andesite is an extrusive igneous rock.


What rocks are formed by fast cooling magma?

Rocks formed by fast cooling magma are typically fine-grained and include rocks like basalt, andesite, and rhyolite. These rocks cool quickly on or near the Earth's surface, resulting in small mineral grains and a smooth texture.