geology microscope focused on illuminated rock

100x 10x abraded agate amygdaloidal amygdule analysis better collection composition dial earth education eroded erosion fine focal focused geological geology geoscience gross hand history igneous illuminated inclusions instrument isle keweenaw lab laboratory lake lapidary learn learning length light magnification metamorphic michigan microscope mineral mineralogy observation optical optics peninsula petrology positioned quartz research rock rounded royale sample science sedimentary skills stone study superior tech technology tuff viewing volcanic volcanology weathered weathering