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The North American craton is the bedrock forming the heart of the North American continent, and the Canadian Shield is the largest exposed part of the craton's bedrock. The Canadian Shield is part of an ancient continent called Arctica , which was formed about 2.5 Ga during the Neoarchean era.
Little Sugar Loaf (Irish: Giolspar, meaning 'Giltspur') [2] is a 342 metres (1,122 ft) hill in the far northeastern sector of the Wicklow Mountains in Ireland. It does not have the elevation to rank on Arderin, Hewitt, or Vandeleur-Lynam scales, [3] [4] [5] however, its prominence of 247 metres (810 ft) ranks it as a Marilyn.
This is a partial list of the largest non-synthetic diamonds with a rough stone (uncut) weight of over 200 carats (40 grams). [1] The list is not intended to be complete—e.g., the Cullinan (formerly Premier) mine alone has produced 135 diamonds larger than 200 carats since mining commenced.
Diamond [a] is a gemstone formed by cutting a raw diamond.Diamonds are one of the best-known and most sought-after gems, and they have been used as decorative items since ancient times.
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Map of Minnesota bedrock by age. Shaded relief image: Superior Upland in the northeast, the flat Red River Valley in the northwest, Central Minnesota's irregular landscape, the Coteau des Prairies and Minnesota River in the southwest, and the southeast's dissected Driftless Area along the Mississippi River below its confluences with the Minnesota and St. Croix in East Central Minnesota
Heavy mineral sands are a class of ore deposit which is an important source of zirconium, titanium, thorium, tungsten, rare-earth elements, the industrial minerals diamond, sapphire, garnet, and occasionally precious metals or gemstones.
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