0
How can mineral composition affect the color of an igneous rock?
Wiki User
∙ 12y ago
Silicate minerals can be light or dark, but Mafic minerals are dark, which is why Basalt appears dark, while Granite is light because Quartz is also light (in colour, not density).
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
Why are some igneous rock dark and other light?
The color will depend on the mineral composition of the magma.
What does the color of an igneous rock tell us about its mineral composition?
It tells us if the rock is Mafic (dark) composed mostly of magnesium and ferrum Or Felsic, (light) composed mostly of silicates such as quartz and feldspbar, or intermediate, a mixture of the two.
Compare the mineral composition of diorite with the mineral composition of andesite?
Both andesite and diorite are igneous rocks with an intermediate color index. Diorite; however, is intrusive and phaneritic, whereas andesite is aphanitic and extrusive. Andesite is said to be the extrusive equivalent of diorite. Diorite is made up of plagioclase feldspar and ferromagnesian mineral crystals, mainly amphibole. Contrarily, andesite may resemble rhyolite, meaning it presents a need for microscopic examination to see its mineral crystals. The two have a composition of plagioclase feldspar and amphibole, but it is much more difficult to detect in andesite.
Which rock has a darker color basalt or granite?
Basalt is generally darker than granite due to mineral composition.
Is the sodalite rock metamorphic igneous or sedimentary?
It's an igneous rock. There is a lot of fluorite in Illinois because this is an area of weakness in the bedrock where magma injections are present. Technically speaking, fluorite is a mineral, and not a rock. However, it is a mineral mostly formed in igneous area's
What 3 things do you look at to key out igneous rocks?
color texture and mineral composition
How Does chemical composition affect the color of igneous rock?
The chemical composition of the rock affects the color of an igneous rockbecause some minerals like quartz change color becasue of t's own
How do you classify igneous rocks?
Look at them. There shape, size, color and feel! Dont worry you will figure it out....
Why are some igneous rock dark and other light?
The color will depend on the mineral composition of the magma.
What causes the different colours in rocks?
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.
What property of a mineral is determined by its chemical composition?
The color of a mineral sample is determined by its chemical composition
How do igneous rocks for?
I think you mean form, so, they are cooled magma and are classified 3 ways: mineral composition (aka color) texture, or if they are made internally or externally
What can you conclude from the color of igneous rocks?
Their origin, and chemical composition.
How does chemical composition effect igneous rocks?
It affects the color.
What 2 properties classify rocks?
They use the mineral composition, color, and texture.
What determines the color of a igneous rock?
The composition of the magma or lava that it cools from.
How can mineral composition affect a rocks color?
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.
