Category | Substance |
---|---|
[rock formed when magma solidifies underground (plutonic rock) or above ground (volcanic rock)] |
|
[rock formed from compacted sediments] |
(p) coquina (h) coralline limestone |
[rock resulting from the transformation of a preexisting rock type by heat and pressure] |
|
[rock containing extractable minerals of some commercial value] |
(v) gossan |
[substances with a specific chemical composition] |
(i) barite (l) malachite (o) orthoclase (q) epidote (t) azurite (x) magnetite (a) molybdenite (f) quartz: (b) selenite gypsum: (c) gypsum alabaster (e) fibrous gypsum (g) pink gypsum (d) calcite: (c) calcite alabaster (m) pyrite: (s) chalcopyrite |
(j) petrified wood (w) fault breccia (y) coal |