Mineral - Wikipedia

Mineral - Wikipedia

A rock is an aggregate of one or more minerals or mineraloids. Some rocks, such as limestone or quartzite, are composed primarily of one mineral – calcite or aragonite in the case of limestone, and quartz in the latter case. Other rocks can be defined by relative abundances of key (essential) minerals; a granite is defined by proportions of quartz, alkali feldspar, and plagioclase feldspar.mineral | Types & Uses | Britannica,Mineral, naturally occurring homogeneous solid with a definite chemical composition and a highly ordered atomic arrangement. Usually formed by inorganic processes, there are several thousand known mineral species, about 100 of which constitute the major mineral components of rocks.Illinois State Geological Survey Using Characteristics of,,Each higher-numbered (harder) mineral will scratch any mineral with a lower number (softer). A rough measure of mineral hardness can be made by assembling a kit of handy objects (table 6). A fingernail has a hardness ranging from 2 to 2.5, a penny is a little harder than 3, window glass ranges from 5.5 to approximately 6 in hardness, and a,Gold Mineral Data,13 - Mineral and Gemstone Kingdom 14 - Mineralienatlas (Deutsch) 15 - Online Mineral Museum 16 - Philatelic Mineralogy 17 - QUT Mineral Atlas 18 - Ruff.Info 19 - Scandinavian mineral gallery 20 - University of Texas at Austin 21 - WWW-MINCRYST 22 - YupRocks. Search for Gold using:,,,,,,