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What is the difference between texture and composition?
BASCILY texture is feel of something an Composition is what does it take to make up something.Texture is based on the sizes, shapes and position of the rocks grains. The Composition of a rock is determined by the minerals that make up the rock. Composition and texture are two characteristics that scientists use to classify rocks.
Does granite have rounded grains?
Granite does not have rounded grains but contains interlocking grains. An example of a rock with rounded grains is a sandstone.
What are rounded grains?
Rounded grains are those that used to be a cubic block and due to chemical weathering the edged have weathered. This led to a rounded grains.
How is sandstone made?
Sand is essentially the result of finely weathered and eroded rock. Harder minerals (such as quartz for example) are found in larger amounts in sand due to their hardness and structure that prevents them from weathering at as fast a rate as minerals with a weaker structureless hardness. The term sand is used to describe the diameter of the individual sand granules. Sand is larger in diameter than silt but smaller than gravel.
What is the role of a fixer in black and white photography?
Films and photo papers contain light-sensitive grains called silver halides. When you develop, the silver halide grains that were struck by light are chemically reduced to black metallic silver. The remaining silver halide grains have to be removed from the material or they'll get dark and ruin your picture. Fixer dissolves the silver halide grains and the water wash which follows removes them so your picture will be permanent.
Does obsidian rock contain few or no mineral grains?
Obsidian is a type of volcanic glass that lacks a crystalline structure, so it does not contain mineral grains. It forms from quickly cooling lava rich in silica, resulting in a smooth, glassy texture without distinct mineral crystals.
When minerals grains flatten and line up in layers a metamorphic rocks has a texture?
A schistose texture.
Why does obsidian contain few or no mineral grains?
The material that would normally form mineral crystals does not have time to form a crystalline structure because of very rapid cooling after volcanically erupting into the air or onto the surface. Obsidian is a volcanic glass.
What rocks don't contain minerals?
most rocks from what i know contain minerals especially sedimentary rocks. and don't all rocks eventually become sedimentary rocks so really don't they all contain minerals to some extent :) hope it helped (by the way i am only a gcse student)
What is the solid aggregate for one or more minerals?
A solid aggregate of one or more minerals is known as a rock. Rocks are composed of mineral grains or crystals that are bound together. Rocks can range in composition, texture, and properties depending on the minerals they contain and how they formed.
Are rocks composed of minerals?
Rocks are for the most part composed of one or more minerals. Obsidian is an exception because the mineral solution (lava) did not have time to form mineral crystals because of very rapid cooling. However, most obsidian will still contain some mineral crystals or crystal inclusions.
Do grains (bread) contain minerals?
Yes, including sodium, potassium, iron and magnesium. Different grains or breads will vary.
What is the difference between a glassy texture and that of other volcanic rocks?
Glassy texture forms when lava cools rapidly, trapping gases and preventing crystal formation. Other volcanic rocks have crystalline textures due to slower cooling rates that allow minerals to form. Glassy rocks like obsidian lack mineral grains, while other volcanic rocks like basalt or granite have visible minerals in their composition.
Which rock has large mineral grains granite obsidian basalt or pumice?
Granite has large mineral grains compared to obsidian, basalt, and pumice. Granite is an intrusive igneous rock that forms deep within the Earth's crust, allowing for the growth of large mineral crystals due to slow cooling. Obsidian, basalt, and pumice are extrusive igneous rocks that cool quickly at the Earth's surface, resulting in smaller mineral grains or a glassy texture.
What is the geology of obsidian?
Obsidian is volcanic glass. unusually amongst the various rocks and minerals it is made of one single piece with no individual grains. this is due to it being cooled extremly rapidly from a magma (most commonly into a cool sea.) the dark colour is caused by heavy amounts of included minerals.
What is limestone texture?
Limestone typically has a fine to medium-grained texture, with visible grains of calcite or dolomite minerals. It may appear dense and compact, with a smooth, granular surface. Depending on the specific type of limestone, it can also contain fossils or other organic remains.
Why does obsidian contain few or no grains?
The material that would normally form mineral crystals does not have time to form a crystalline structure because of very rapid cooling after volcanically erupting into the air or onto the surface. Obsidian is a volcanic glass.
