Microcrystalline 5121006 56593839 2006-06-03T01:09:45Z Vsmith 84417 Make a sentence + cats A '''microcrystalline''' material is a crystallized substance or [[rock (geology)|rock]] which contains small [[crystals]] that are visible only through [[microscope|microscopic]] examination. {{geology-stub}} [[Category:Mineralogy]] [[Category:Petrology]]