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What is the difference between coarse grained and fine grained rocks?
Coarse grain varieties (with mineral grains large enough to see without a magnifying glass) are called phaneritic. Granite and gabbro are examples of phaneritic igneous rocks. Fine grained rocks, where the individual grains are too small to see, are called aphanitic. The most common glassy rock is obsidian.
What are the differences in the textures of igneous rocks?
Igneous rocks may be simply classified according to their chemical/mineral composition as felsic, intermediate, mafic, and ultramafic, and by texture or grain size: intrusive rocks are course grained (all crystals are visible to the naked eye) while extrusive rocks may be fine-grained (microscopic crystals) or glass ( …
What are two differences between a coarse-grained and fine grained texture?
Coarse-grained soil and fine-grained soil are two different types of soil that can be identified based on their texture or ‘feel’ and particle size….Differences Between Coarse-Grained and Fine-Grained Soil.
| Coarse-grained soil | Fine-grained soil |
|---|---|
| Coarse-grained soil feels gritty when touched by hand | It feels smooth, greasy and sticky when touched by hand |
What is coarse-grained texture?
Coarse-grained textures generally indicate magmas that slowly cooled deep underground. Slow cooling gives crystals enough time to grow to easily seen sizes (i.e., larger than 1 mm). Thus, you can often figure out the relative order in which the minerals crystallized from the magma.
What is texture in igneous rocks?
The texture of an igneous rock made up entirely of crystals big enough to be easily seen with the naked eye is phaneritic. Phaneritic texture is sometimes referred to as coarse-grained igneous texture. Granite, the most well known example of an intrusive igneous rock, has a phaneritic texture.
What is texture in reference to igneous rocks?
The texture of a rock refers to the details of its visible character. This includes the size and quality and interrelations of its grains and the fabric they form. Larger scale features, such as fractures and layering, are considered rock structures in comparison.
What is the texture of sedimentary rocks?
Texture: Sedimentary rocks may have clastic (detrital) or non-clastic texture. Clastic sedimentary rocks are composed of grains, fragments of pre-existing rocks that have been packed together with spaces (pores) between grains. Clastic sedimentary rocks are subdivided on the basis of grain size.
What are the 5 examples of sedimentary rocks?
Examples include: breccia, conglomerate, sandstone, siltstone, and shale. Chemical sedimentary rocks form when dissolved materials preciptate from solution. Examples include: chert, some dolomites, flint, iron ore, limestones, and rock salt.
What is igneous rock examples?
Examples of intrusive igneous rocks are: diabase, diorite, gabbro, granite, pegmatite, and peridotite. Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. These rocks include: andesite, basalt, dacite, obsidian, pumice, rhyolite, scoria, and tuff.
What is sedimentary rock example?
Sedimentary rocks are formed by the accumulation of sediments. Examples include: chert, some dolomites, flint, iron ore, limestones, and rock salt. Organic sedimentary rocks form from the accumulation of plant or animal debris. Examples include: chalk, coal, diatomite, some dolomites, and some limestones.