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Fougèrite was first found in forested soils near Fougères, Brittany, France, and recognised as a valid mineral species by the International Mineralogical Association in 2002. [2] It is blue-green to bluish-gray in colour, and resembles clay minerals in habit, forming hexagonal platelets of submicron diameter.
Amazonite, also known as amazonstone, [4] is a green tectosilicate mineral, a variety of the potassium feldspar called microcline. [ 4 ] [ 5 ] [ 6 ] Its chemical formula is KAlSi 3 O 8 , [ 1 ] [ 7 ] which is polymorphic to orthoclase .
Palygorskite was first described in 1862 for a deposit at Palygorskaya on the Popovka River, [9] Middle Urals, Permskaya Oblast, Russia. [3] [7] The synonym attapulgite is derived from the U.S. town of Attapulgus, in the extreme southwest corner of the state of Georgia, where the mineral is abundant and surface-mined.
Glauconite is an iron potassium phyllosilicate (mica group) mineral of characteristic green color which is very friable [5] and has very low weathering resistance.. It crystallizes with a monoclinic geometry.
Vivianite is a secondary mineral found in a number of geologic environments: the oxidation zone of metal ore deposits, in granite pegmatites containing phosphate minerals, in clays and glauconitic sediments, and in recent alluvial deposits replacing organic material such as peat, lignite, bog iron ores and forest soils (all).
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Tephroite is the manganese endmember of the olivine group of nesosilicate minerals with the formula Mn 2 Si O 4. A solid solution series exists between tephroite and its analogues, the group endmembers fayalite and forsterite. Divalent iron or magnesium may readily replace manganese in the olivine crystal structure.
A Mass General Brigham emergency care doctor shares step-by-step guidance on how to administer the Heimlich maneuver to adults, children and yourself in a choking event.
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