New York State Museum Bulletin, Nummer 181

Adirondack albite anorthosite appearance Ausable Forks beds belt biotite building stone calcite carbonate cent chemical coarse color composition compression crushed stone crystalline crystals cubic foot dark diabase diameter dikes diorite dolomite durability east Economic Geology Entomology exposed exposure feet long feldspar feldspar and quartz foliation formations fractures gabbro gneiss gneissoid Gouverneur grain granite gray hornblende Hudson igneous rocks inch ingredients intrusion iron Island joints Lake latter lime limestones magnetite mainly Manhattan schist marble mass massive material metamorphic mica microcline Microscopic miles minerals monumental Museum occur outcrop particles Peekskill pegmatite Physical tests pink plagioclase polished pounds Precambric present pyroxene quadrangle quartz quartz and feldspar railroad red granite Report ridge river samples sandstones schist sedimentary sediments serpentine shales shows silicates Siluric specific gravity St Lawrence county strength structure surface syenite texture variety vicinity weathering Yonkers York