SCIENCE - Igneous Rocks (Rocks and Minerals)
Igneous rocks are formed from molted rocks. Here some pictures and description of igneous rocks.
- BASALT
Basalt is a mineral that comes from fissure flows of lava or a lava from quiet volcanoes. Basalt is a meduim to a dar-gray rock it is heavy and fine drained. Basalt that broken into small pieces called traprock.
- FELSITE
Felsite is the name earth scienctist give to any light colored, fine grained igneous rock. You cannot easily see the individual grains of felsites, it is very hard to identify the felsites with a special kind of microscope. Felsite rocks are usually made from light colored lavas, these rocks are often color light-grey, yellow, green or even red.
- GRANITE
Granite is one o our most common igneous rocks, made deep under the ground. Hranite is made from quartz, feldspar and mica. These are all minerals, quartz and feldspar are light colored, they make a granite a light colored rock. The little bits of mica in granite makes the daek spots. Granite maube colored pink, yellow, red or brown. Often it is a mixture of colors in between.
- DIORITE
Diorite is an igneous rock it is made like granite, but it is such darker in color, it is darker than granite because it has no white quartz in it. Diorite is made of dark minerals, dark feldspar and hornblende.
- PUMICE
pumice is an igneous rock, it is found when pieces of magma contain trapped bubbles of gases or steam are thrown out of a volcano. After the magma cools it is honey-combed with hundreds of small holes. These are the remains of the gas and steam bubbles. A piece of pumice is like a piece of bread without the crust. A piece of pumice floats on water because of the air that is trapped in the bubble holes.
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