Igneous—formed from melted or partially molten rock
Inclusion—a mineral phase that is distinct (in composition or appearance) from the main mineral components of a rock
Limestone—a sedimentary rock, chiefly composed of calcium carbonate; formed from the shells of marine animals
Marble—a metamorphic rock, chiefly composed of calcium carbonate
Metamorphic—changed; usually by heat or pressure to a different form but the same composition
Mica—a silicate mineral that forms sheets or layers and contains aluminum, hydroxyl, and alkali ions: K₂Al₄Si₆Al₂O₂₀(OH,F)₄, K₂(Mg,Fe)₆Si₆Al₂O₂₀(OH,F)₄
Mineral—a naturally occurring inorganic substance with an ordered structure; rocks are made of one or more minerals
Portico—a porch, with a roof supported by columns
Pyrite—a mineral (“fool’s gold”) composed of iron sulfide: FeS₂
Pyroxene—a silicate mineral containing two metal oxides: CaMgSi₂O₆, CaFeSi₂O₆, (Mg,Fe)SiO₃