This is a preview. Log in through your library . Abstract The formation of quartzo-feldspathic rocks-principally pegmatites-is discussed from the viewpoint of thermodynamic stability of minerals and ...

Cata-, meso-, and epinorms are proposed for metamorphic rocks. The catanorm is essentially the CIPW norm calculated on the basis of molecular percentages and applied to high-grade metamorphic rocks.

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Igneous rocks close igneous rockIgneous rocks are those which have been formed by the cooling and solidification of molten rock (magma) from underneath the earth’s crust. are formed by magma from the ...

Aaron O’Connell, the director of research at the Clements Center for National Security, moderated a panel with Jim Goldgeier, a visiting scholar at the Center for International Security and ...

Harvard astrophysicist Avi Loeb remains cautious about moving the interstellar object 3I/ATLAS from Rank 4 on his own Loeb Classification Scale. The scale, which is between 0 (natural icy rocks) and ...