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The different colours are from different minerals. A reddish colour could be due to a mineral containing a lot of iron, for example. Weathering, staining, mineralogy and method of formation all play a part.
Rocks vary in composition depending the availability and type of mineral present during their formation.
Its color
olivine, pyroxene, and calcium-rich plagioclase
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color, texture, grains, mineral composition, and origin.
color texture and mineral composition
This is out of "Prentice Hall Science Explorer"MINERAL COMPOSITION AND COLOR"Rocks are made of mixtures of minerals and other materials. Some rocks contain only a single mineral. Others can contain several minerals. These minerals are known as rock-forming minerals.A rock's color provides clues to the rock's mineral comp. For example, granite is generally a light-colored rock that has high silica content. Basalt, is a dark colored rock that is low in silica. But as with minerals, color alone does not provide enough information to identify a rock.Geologists observe the shape and color of crystals in a rock to identify the minerals that the rock contains. In identifying rocks, geologists also use some of the tests that are used to identify mineral's. For example, testing the surface of a rock with acid determines whether the rock includes minerals made of compounds called carbonates."
Look at them. There shape, size, color and feel! Dont worry you will figure it out....
Mostly death
The different colours are from different minerals. A reddish colour could be due to a mineral containing a lot of iron, for example. Weathering, staining, mineralogy and method of formation all play a part.
No. It can vary from the visible color of the mineral and, since visible color of them ineral is not a reliable indicator of type, it is important to learn to use streak, (along with other factors), to correctly identify a mineral.
An iceberg composition is almost entirely ice, with some rocks and other material's. white in color and the color of the rocks and minerals.
Rocks vary in composition depending the availability and type of mineral present during their formation.
Hardness, resistance to weathering, texture, mineral composition, color, and porosity.
And their texture, which can be aphanitic, phaneritic, glassy, or porphyritic. mineral composition and crystal texture