1. Minerals

2. Graphite Hardness: 2-3 Streak: Gray/black Luster: Greasy
Specific gravity 1.9-2
Used in pencils

3. Hornblende Hardness: 5-6 Streak: Grey Luster: Shiny
Specific gravity: 3.2

4. Magnetite Hardness: 5.5 Streak: Black Luster: Metallic
Specific gravity: 5.2
Magnetic!

5. Galena Hardness: 2.5 Streak: Grayish-black Luster: Metallic
Specific gravity: 7.4

6. Mica (muscovite) Hardness: 2-2.5 Streak: White
Luster: Pearly, metallic
Specific gravity: 2.8
-Cleaves into sheets
- Used in make-up (for shimmer)

7. Pyrite Hardness: 6.5 Streak: Greenish-black Luster: Metallic
Specific gravity:
Also known as “Fool’s Gold”

8. Calcite Hardness: 3 Streak: White Luster: Glassy Specific gravity: 2.7
Rhombohedral cleavage
Dissolves in acid

9. Halite Hardness: 2.5 Streak: White Luster: Glassy
Specific gravity: 2.17
Rock salt
Cubic

10. Quartz Hardness: 7 Streak: White Luster: Greasy Specific gravity: 2.65
Hard enough to cut glass
Primary mineral found in sand

11. Talc Hardness: 1 Streak: White Luster: Dull/pearly
Specific gravity:
Often used as a powder

12. Sulfur Hardness: 2.5 Streak: White Luster: Waxy Specific gravity: 2.06
Smells like rotten eggs

13. Corundum Hardness: 9 Streak: White Luster: Vitreous
Specific gravity: 4
Rubies and sapphires

14. Hematite Hardness: 6-6.5 Streak: Red-brown Luster: Dull
Specific gravity: 5.2
Mineral form of iron oxide

15. Fluorite Hardness: 4 Streak: White Luster: Greasy
Specific gravity:

16. Olivine Hardness: 6.5-7 Streak: White Luster: Greasy
Specific gravity: