Black Like Tar by dakotabluemoon ()
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Again this is one we did not know about but i see someone has identified the other one so thank u so much for that and will look it up for more info also if i have not gotten to ur page i will soon thank u all for being such good friends.
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Looks like Peridotite Peridotite is a generic name used for coarse-grained, dark-colored, ultramafic igneous rocks. Peridotites usually contain olivine as their primary mineral, frequently with other mafic minerals such as pyroxenes and amphiboles. Their silica content is low compared to other igneous rocks and they contain very little quartz and feldspar. Peridotites are economically important rocks because they often contain chromite - the only ore of chromium; they can be source rocks for diamonds; and, they have the potential to be used as a material for sequestering carbon dioxide. Much of Earth's mantle is believed to be composed of peridotite. Sourced from geology.com