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Emerald is a gemstone and a variety of the mineral beryl (Be 3 Al 2 (SiO 3) 6) colored green by trace amounts of chromium or sometimes vanadium. [2] Beryl has a hardness of 7.5–8 on the Mohs scale . [ 2 ]
Emerald rockcod have a short first dorsal fin with 4–6 spines and a long second dorsal fin with 34–39 soft rays that runs from about the center of the body to near the caudal fin. The emerald rockcod's anal fin contains 31–35 rays, running along a similar length as the second dorsal fin. Its caudal fin is rounded and contains 10–14 rays.
An 836-pound “cursed” emerald worth nearly $1 billion will be returned to Brazil after 15 years under lock and key in Los Angeles. The 180,000-carat Bahia Emerald was smuggled out of the South ...
Leaders of states in the U.S. which have significant mineral deposits often create a state mineral, rock, stone or gemstone to promote interest in their natural resources, history, tourism, etc. Not every state has an official state mineral, rock, stone and/or gemstone, however.
Helenite, also known as Mount St. Helens obsidian, emerald obsidianite, and ruby obsidianite, is a glass made from the fused volcanic rock dust from Mount St. Helens and marketed as a gemstone. [ 1 ] [ 2 ] Helenite was first created accidentally after the eruption of Mount St. Helens in 1980 .
The Bahia Emerald is one of the largest emeralds and contains the largest single crystal ever found. The stone, weighing approximately 379 kg (836 lbs) [ 1 ] (approximately 189,600 carats) originated from Bahia , Brazil ; its emerald crystals embedded in black schist .
Underwater archaeologists dug under 20 feet of sand and rock off the coast of Sicily and found a 2,500-year-old shipwreck. Researchers date the find to either the fifth or sixth century B.C. Six ...
Rock and dust samples retrieved by NASA from the asteroid Bennu exhibit some of the chemical building blocks of life, according to research that provides some of the best evidence to date that ...