Rocks igneous metamorphic and sedimentary rocks hold the history of the earth and the materials that will be used to build its future igneous igneous rocks mineral show photos from the 2010 tucson gem mineral fossil show caliche caliche is a lithified layer in soil or sediment it is considered to be a sedimentary rock. Rms internets most comprehensive source for rock and mineral shows geosites and rock clubs in the usa august 2018 capital mineral club show september 2018 mid hudson valley club show september 2018 denver gem mineral club show pikes peak gem and mineral show csms. Rock and mineral society club shows by state on rms your source for fm afms gem mineral shows august 2018 capital mineral club show september 2018 mid hudson valley club show september 2018 denver gem mineral club show september 2018 harrisburg mineral show october 2018 tulip city michigan gem show. This is a list of minerals for which there are articles on wikipedia minerals are distinguished by various chemical and physical properties differences in chemical composition and crystal structure distinguish the various specieswithin a mineral species there may be variation in physical properties or minor amounts of impurities that are recognized by mineralogists or wider society as a . 3 types of rocks on the bases of their formation rocks are broadly divided into three types namely igneous rocks sedimentary rocks and metamorphic rocks igneous rocks are found in volcanic