| Identification | |
| Colour | Straw yellow |
| Streak | Greenish-black |
| Luster | Metal |
| Hardness | 6-6,5 |
| Cleavage | imperfect |
| Fracture | Conchoidal |
| Сrystal system | Isometric |
Uses: Transparent barite crystals are used in optical devices. Used for protection from X-rays, for coatings and insulation in chemical plants.
Deposits: Western Georgia, Turkmenistan, Germany
Халькопирит
| Identification | |
| Colour | Brass-yellow, often with iridescent tarnish |
| Streak | Grayish-black |
| Luster | metallic |
| Hardness | 3,5 |
| Cleavage | Imperfect |
| Fracture | uneven to conchoidal |
| Сrystal system | The tetragonal |
Uses: The main raw material for arsenic and its compounds.
Deposits: Suzdal, Wasilewski.
Date of last changes:18.03.2019
