chrysolite: a brown or yellow-green olivine found in igneous and metamorphic rocks and used as a gemstone
substance: the real physical matter of which a person or thing consists
chlorophyta: large division of chiefly freshwater eukaryotic algae that possess chlorophyll a and b, store food as starch, and cellulose cell walls; classes Chlorophyceae, Ulvophyceae, and Charophyceae; obviously ancestral to land plants