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The era of greyhound racing in the U. See how people have imagined life on Mars through history. See More. United States Change. The light-colored igneous rock, granite, has little grains on it. It Contains quartz, feldspar, mica, and others.
Its colors varied from red, pink to gray and whites. Granite can be used as decorative rock, mostly in countertops, tile floors, stair treads, and in many other creative ways! Turquoise is a blue-to-green mineral formed by percolating acidic aqueous solutions during the oxidation of the other minerals. Jewelry related, it is one of the most known gemstones out there that can transform your look from an 8 to a 10!
Obsidian is a kind of igneous rock. It has a dark color, sometimes green, sometimes brown. It is made out of solidified lava. In time, the glass transforms itself into fine-grained crystals. Obsidian was used in the Stone Age for creating axes, arrowheads, and different weapons. Nowadays, sharp blades are made out of them for heart surgery purposes. Its name comes from North Carolina. Unakite is not a very popular gemstone, but it is used in hippie-style jewelry for people who like their bling with an edge!
It is a beautiful looking stone because it has a pretty crystal shape and it seems like real shiny gold! This one is the most known out of the sulfide minerals, and it can make cool sparkles if you rub it against steel. Ammonite was a warm sea mollusk creature that lived in the Jurassic Period times. Its texture resembled the nowadays octopus. Ammonites stones have been extinct for 65 million years, and specialists use them as index fossils for deciding geological periods.
They contain minerals, and they are usually cut in half so you can appreciate the gemstone inside. Tektites are the driest minerals on Earth very low on water. They are made of terrestrial rocks and have a homogenous composition. They are believed to be the result of meteorites hitting the Earth. Geodes are spherical rocks that carry hollow cavities lined with crystals.
They are formed in volcanoes or sedimentary rock, in which air, mud, or tree roots make a void in the rock, while the exterior hardens into a spherical form. Then the groundwater filled with minerals starts flowing around and through these geodes. TIP: Are you fascinated by geodes? If so, then it is good to know how to recognize fake and real geodes or dyed geodes.
Another interesting topic about geodes is their value. Find out more in the articles below:. While the magma was rising, it tore off chunks of the surrounding mantle rock and transported it to the surface. The Nullarbor is a desert plain region which straddles the border of South Australia and Western Australia. The dry environment is ideal for preserving meteorites that fall to Earth, and the light colour of the limestone country rock and lack of vegetation means the black and brown meteorites are easier to see.
Most meteorites are iron-rich, so wandering around with a magnet hovering over the surface is a good way to pick them up. Thousands of meteorites have been found in the Nullarbor, some up to 40, years old. But the geological conditions that created the ore deposit around 1. This process caused the rock to start melting and created the striking stripey, garnet-rich rocks we find there today. It is the main host of iron ore, and can be found in several regions in Western Australia.
The Hamersley Province in the northwestern part of Western Australia has the thickest and most extensive banded iron formations in the world. They are about 2.
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