chert sedimentary rocks

actinolite and argillite backgrounds bituminous breccia brownstone california canada carolina catlinite chert chlorite collection colombia concrete conglomerate connecticut crumplet for garnetiferous geological geologists geology glauconite greensand greenstone hampshire hexagonite jaspilite limestone massachuset mica minerals minnesota missouri new north obteined oklahoma ottrelite phyllite phyllitesedimentary quartz quebec rocks sample sandstone schist sedimentary sericite sioux soapstone soils staurolite study talc textures tripoli vermont virginia york