ultrabasic
21Age of the Earth — This article is about scientific estimates of the age of the Earth. For religious and other non scientific estimates, see Dating Creation. Earth as seen from Apollo 17 The age of the Earth is 4.54 billion years (4.54 × 109 years ± 1%) …
22Orders of magnitude (time) — Contents 1 Seconds 2 See also 3 Years 4 See also 5 Footnotes …
23Goldschmidt classification — The Goldschmidt classification, developed by Victor Goldschmidt, is a geochemical classification which groups the chemical elements according to their preferred host phases into lithophile (rock loving), siderophile (iron loving), chalcophile… …
24Rùm — Infobox Scottish island GridReference=NM371982 celtic name=Rùm norse name=possibly rõm øy meaning of name=Gaelic isle of the ridge (i dhruim), Norse wide island but may be pre Celtic area=10,463 ha area rank=15 highest elevation=Askival 812 m… …
25Baltic Shield — The Baltic Shield (sometimes referred to as the Fennoscandian Shield) is located in Fennoscandia (Norway, Sweden and Finland), northwest Russia and under the Baltic Sea. The Baltic Shield is defined as the exposed Precambrian northwest segment of …
26Northern Isles — This article is about the large group of Scottish islands including Orkney and Shetland. For the northern islands of Shetland, see North Isles. The Northern Isles of Scotland. The Northern Isles (Old Norse: Norðreyjar; Scots Gaelic: Na h Eileanan …
27Magnesite — General Category Carbonate mineral Chemical formula MgCO3 …
28Sorocaba — is a city in southeastern Brazil, in the southwestern portion of São Paulo State (96 km west of Sao Paulo City). As of 2007, its population was approximately 590,846. The title of Manchester Paulista was given to the city in the end of 19th… …
29Peridotite — A peridotite is a dense, coarse grained igneous rock, consisting mostly of the minerals olivine and pyroxene. Peridotite is ultramafic and ultrabasic, as the rock contains less than 45% silica. It is high in magnesium, reflecting the high… …
30Ultramafic rock — Ultramafic (also referred to as ultrabasic) rocks are igneous and meta igneous rocks with very low silica content (less than 45%), generally >18% MgO, high FeO, low potassium, and are composed of usually greater than 90% mafic minerals (dark… …
