PHYSICAL PROPERTIES | MINERAL NAME, FORMULA |
|---|---|
| BRICK RED color; red brown streak; EARTHY LUSTER; H=(variable, but generally soft in the earthy form); heavy. Looks like rust. | HEMATITE, Fe2O3 |
| BLACK, DARK GRAY, DARK GREEN, but light colors are more common;EFFERVESCES (fizzes) IN DILUTE HCl acid; H=3. | CALCITE, CaCO3 |
| DARK GRAY, BLACK, but also light colors; commonly in fine-grained granular masses; REACTS WEAKLY WITH HCl acid (slowly or only if sample is powdered); H=3-3.5. | DOLOMITE, CaMg(CO3)2 |
