Light-colored igneous rock characterized by fine-grained saccharoidal texture, ranging in composition from gabbro to granite, consisting of quartz, potassium feldspar, and high acid plagioclase
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The texture of igneous rock in which crystalline components are too small to be detected visually by the unaided eye. Syn. Cryptocrystalline
The top or terminal edge of 2 or more points of a geological structure
A hexagonal or monoclinic pseudohexagonal mineral with the general formula A5(XO4)3(F,Cl,OH) , where A = (Ba,Ca,Ce,K,Na,Pb,Sr,Y) and X = (As,C,P,Si,V). Calcium Phosphate
A fixed iron block used as a base for hammer forging steel
An extremely brittle metal with a crystalline, flaky texture. Symbol, Sb
A folding or arching of layered rock
Coal containing a low percentage of volatile matter and having a high percentage of fixed carbon
A substance containing gold
A monatomic, inert, colourless gas. Symbol, Ar. Used in light bulbs and fluorescent tubes