Aquamarine forms when magma under the Earth's crust interacts with mineral-rich rocks under mountain ranges. The magma cools as it enters fissures and crevasses of rocks called pegamites. The minerals in the pegamites heat up when they interact with the magma, forming the gemstone.Know More
Pegamites are a type of rock that is formed primarily of mineral crystals. Almost all aquamarines are formed in pegamites. Aquamarine is a type of mineral called beryl. Beryl can be many colors, but when it is blue or blue-green, it is called aquamarine. Another common gemstone with beryl composition is morganite, which is pink. The color the beryl takes depends on the minerals it interacts with. Aquamarine is a combination of beryllium and aluminum silicate.
Aquamarine can be found in many places around the world where there are mountain ranges. It is mined in Africa, India, South America, Russia and North America. The quality of aquamarine depends primarily on its color. The gem is more valuable the deeper the blue-green color. Most aquamarine jewelry has lighter-colored stones. Other rare aquamarines have a cat's-eye effect, which is a line of shimmering light that can be viewed from different angles. Unlike many gemstones, most aquamarines are flawless, making them a good choice for rings and pendants.Learn more about Precious Metals & Gems
A volcanic neck forms when lava inside a caldera cools after magma stops feeding the mountain, and then the outside of the extinct volcano erodes after millions of years. The cooled lava remains intact because it is harder than the surrounding rock that eroded. Perhaps the most famous volcanic neck in the United States is Devil's Tower in Wyoming.Full Answer >
The formation of volcanic islands occurs as tectonic plates move over fixed "hot spots" in the ocean, where underground rock melts to form magma. This magma rises to the surface to become lava that cools and builds up mounds, which eventually break through the surface of the water to form islands. The process takes thousands of years and involves hundreds of eruptions, explains Live Science.Full Answer >
Experts believe that the lunar highlands formed from magma. This theory is known as the lunar magma ocean hypothesis and is supported both by Apollo observations and images taken by the Japan Aerospace Exploration Agency.Full Answer >
The colors of the Twelve Tribes of Israel are red; green; a striped red, white and black; sky blue; dark blue; clear; blue; purple; gray; aquamarine, black and lastly, a mixture of all colors. The colors derive from gemstones spoken of in Exodus and the Midrash, which states that each stone of the Twelve Tribes’ breastplate matched the flag’s background.Full Answer >