Asked by: Licet Rujenkovscience geology
How do you identify a igneous rock?
Last Updated: 20th January, 2020
- Determine the color (indicates mineral composition)
- Determine the texture (indicates cooling history)
- Phaneritic = large grains.
- Aphanitic = small grains (too small to identify withthenaked eye)
- Porphyritic = fine grains mixed with larger grains.
- Vesicular = holes.
- Glassy = glass-like.
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Also question is, how can you tell what kind of rock you have?
There are three main categories of rocks,whichare defined by how the rocks are formed.Sedimentaryrock is often found in layers. One way totell if arock sample is sedimentary is to see if itis made fromgrains. Some samples of sedimentary rocksinclude limestone,sandstone, coal and shale.
Likewise, how can you tell the difference between sedimentary and igneous rocks? Know the difference between the threemajorrock types. Igneous rocks are made from the rapid orslowcooling of magma/lava. Metamorphic rocks change formbasedon the influence of heat, pressure, or chemicalactivity.Sedimentary rocks are essentially formed by piecesofsmaller rocks, fossils,andsediments.
Simply so, what is the texture of igneous rocks?
There are nine main types of igneousrocktextures: Phaneritic, vesicular, aphanitic,porphyritic,poikilitic, glassy, pyroclastic, equigranular, andspinifex. Eachkind of texture has a variety of differentcharacteristicsthat make them unique.
How do you classify a rock?
Classifying Rocks. Rocksareclassified as either Igneous, Sedimentary, orMetamorphic.Igneous rocks are formed by volcanic activity.They areclassified further by their origin, texture, andmineralcomposition.