mineral sequence
1primary mineral — ▪ mineral classification in an igneous rock, any mineral that formed during the original solidification (crystallization) of the rock. Primary minerals include both the essential minerals used to assign a classification name to the rock and …
2borate mineral — Borate minerals Borate mineralsany of various naturally occurring compounds of boron and oxygen. Most borate minerals are rare, but some form large deposits that are mined commercially. Borate mineral structures incorporate either… …
3The Echorium Sequence — is a fantasy trilogy by Katherine Roberts. The trilogy comprises Song Quest (1999), Crystal Mask (2001), and Dark Quetzal (2003).The trilogy follows the tales of The Echorium; the singers located on the Isle of Echoes. In the first book, Song… …
4humite — ▪ mineral member of a group of layered silicate minerals related to the olivines that are nearly always restricted in occurrence to altered limestones and dolomites adjacent to acid or alkaline plutonic rocks and to skarns (skarn) (contact… …
5dating — I In geology and archaeology, the process of determining an object s or event s place within a chronological scheme. Scientists may use either relative dating, in which items are sequenced on the basis of stratigraphic clues (see stratigraphy) or …
6Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …
7igneous rock — Any of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary …
8Henry W. Posamentier — Henry William Posamentier (born December 4, 1948) is an American geologist. He helped pioneer and develop the modern approach to sequence stratigraphy, blending the disciplines of sedimentology, stratigraphy, and depositional systems analysis,… …
9geology — /jee ol euh jee/, n., pl. geologies. 1. the science that deals with the dynamics and physical history of the earth, the rocks of which it is composed, and the physical, chemical, and biological changes that the earth has undergone or is… …
10Superior 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… …
