metasomatized
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Mont Saint-Hilaire — (Dieppe and Rocky summits) seen from Otterburn Park. Elevation … Wikipedia
Superior craton — in the west. The western margin extends from northern Minnesota through eastern Manitoba to northwestern Ontario.The formation of the Superior craton is best explained within the context of 2.72 2.68 Ga accretion of small continental plates and… … Wikipedia
Warwickite — is an iron magnesium titanium borate mineral with formula: (MgFe)3Ti(O,BO3)2 or Mg(Ti,Fe3+,Al)(BO3)O. It occurs as brown to black prismatic orthorhombic crystals which are vitreous and transparent. It has a Mohs hardness of 3 to 4 and a specific… … Wikipedia
Myrmekite — describes a vermicular, or wormy, intergrowth of quartz in plagioclase. The intergrowths are microscopic in scale, typically with maximum dimensions less than 1 millimeter. The plagioclase is sodium rich, usually albite or oligoclase. These… … Wikipedia
Cameroon line — Map of the Gulf of Guinea, showing the chain of islands formed by the Cameroon line of volcanoes. The Cameroon line is a 1,000 km (620 mi) chain of volcanoes.[1] It includes islands in the Gulf of Guinea and mountains that extend along… … Wikipedia
pyroxene — pyroxenic /puy rok sen ik/, adj. /puy rok seen, peuh , puy rok seen /, n. any of a very common group of minerals of many varieties, silicates of magnesium, iron, calcium, and other elements, occurring as important constituents of many kinds of… … Universalium
brittle mica — ▪ mineral any member of the mica group of silicate minerals that has calcium instead of potassium or sodium. The calcium substitution increases the aluminum to silicon ratio that enhances hardness. This causes it to break instead of bend.… … Universalium
