metamorphosed chemical rocks
Metamorphic rocks result from the subjection of a protolithic parent rock (igneous, sedimentary, or metamorphic) to heat and/or pressure and/or chemically active fluids. Metamorphic rocks are classified according to the parent rock and the degree of deformation to which the rocks have been subjected. Metamorphism occurs locally (contact) or on a large scale (regional).
Chemical metamorphic rocks:
| Composition | Mineral Name | Rock Name/Ore |
| Au | Gold | Gold Ore |
| Ag | Silver | Silver Ore |
| Cu | Copper | Copper Ore |
| Pt | Platinum | Platinum Ore |
| S | Sulfur | Native Sulfur |
| CaF2 | Fluorite | Fluorospar |
Deposition of metals results from regional metamorphism, volcanism, hydrothermal vents, and sulphide solutions:
| Composition | Mineral Name | Rock Name/Ore |
| PbS | Galena | Lead |
| ZnS | Sphalerite | Zinc |
| FeS2 | Pyrite/Marcasite | Iron |
| (Cu,Fe)S2 | Chalcopyrite | Copper |
Solutions of hot water chemically alter carbonates and silicates:
| Composition | Mineral Name | Rock Name |
| SiO2 transparent | ... | Quartz, rock crystal |
| SiO2 translucent | ... | Jasper, flint, chert, quartz, chalchedony, agate, silicified fossils, petrified wood |
| CaCO3 | Calcite | Travertine marble, geodes, stalactites/stalagmites |
