Matching Pairs Minerals VocabularyOnline version Mineral vocabulary words by Tabitha Najera 1 hardness 2 Minerals 3 vitreous 4 color 5 pearly 6 metallic 7 silky 8 dull 9 streak 10 adamantine 11 luster 12 Fredrich Mohs poor reflectors, rough pearl like shiny, smooth The color left behind when you scratch the mineral on a hard surface smooth ( baby powder) created the hardness scale in 1822 glassy (70% minerals) diamond like (high Shine) a naturally formed, inorganic solid with a crystal structure reflects light Most obvious! Least dependable looks like metal how well a mineral resists being scratched