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Moldavite (Czech: vltavín) is a forest green, olive green or blue greenish vitreous silica projectile glass formed by a meteorite impact in southern Germany (Nördlinger Ries Crater) [3] that occurred about 15 million years ago. [4]
2 Gemstones. 3 Metals. 4 See also. 5 References. Toggle the table of contents. Lists of countries by mineral production. 4 languages.
Bahia Emerald [2]; Carolina Emperor, [3] [4] 310 carats uncut, 64.8 carats cut; discovered in the United States in 2009, resides in the North Carolina Museum of Natural Sciences, Raleigh, NC, US
Many gems are crystals which are classified by their crystal system such as cubic or trigonal or monoclinic. Another term used is habit, the form the gem is usually found in. [12] For example, diamonds, which have a cubic crystal system, are often found as octahedrons. [13] Gemstones are classified into different groups, species, and varieties.
Aubrey Burl's gazetteer lists 1,303 stone circles in Britain, Ireland and Brittany ( France).Most of these are found in Scotland, with 508 sites recorded. There are 343 on the island of Ireland; 316 in England; 81 in Wales; 49 in Brittany (France); and 6 in the Channel Isles.
This is a list of gemstones, organized by species and types. Minerals. There are over 300 types of minerals that have been used as gemstones. Such as: A–B
The geology of Europe is varied and complex, and gives rise to the wide variety of landscapes found across the continent, from the Scottish Highlands to the rolling plains of Hungary. Europe's most significant feature is the dichotomy between highland and mountainous Southern Europe and a vast, partially underwater, northern plain ranging from ...
A major marine transgression reach the current Jordan River. Marl and siliceous rocks deposited during continued transgression in the Albian, Turonian, Santonian, Campanian and Maastrichtian, while continental deposition took place in the Nubo-Arabian Shield in the southeast. The Sirhan Basin, Al Jafr Basin and Al Azraq Wadi all accumulated ...