2. Taxonomic Key For the Forms of Quartz 1a) Mineral has six-side hexagonal crystals and visible crystal facets 1b) Mineral has no visible crystal facets. Go to 3) Go to 2)

3. 3) Quartz Crystals Chert Jasper

4. Crystalline Quartz 3a) Rock Crystal 3b) Amethyst

5. Crystalline Quartz 3c) Citrine Rose Quartz Crystals (only in museums)

6. Crystalline Quartz 3d) Smoky Quartz (Bonus)

7. Taxonomic Key 2a) Mineral consists of glassy or pearly luster (transparent) 2b) Mineral appears waxy or subvitreous (translucent) Go to 4) Go to 7)

8. Taxonomic Key 4b) Mineral has glassy crystal chunks Go to 6) Go to 5)

9. 5) Massive Crystalline Quartz 5a) Milky Quartz5b) Rose Quartx

10. Massive Crystalline Quartz 5c) Aventurine

11. Massive Crystalline Quartz 5d) Tiger Eye

12. Jasper 6) Noncrystalline Quartz - Opal 6a) White Opal 6b) Black Opal

13. Jasper 6) Noncrystalline Quartz - Opal 6a) White Opal 6c) Fire Opal 6a) White Opal

14. 6) Noncrystalline Quartz - Opal 6d) Common Opal SEM Image of Opal

15. 6d) Common Opal 6) Noncrystalline Quartz - Opal

16. 7/9) Cryptocrystalline Quartz - Translucent Chalcedony

17. Cryptocrystalline Quartz - Translucent Carnelian

18. Cryptocrystalline Quartz Chrysoprase

19. Cryptocrystalline Quartz - Opaque Flint Chert

20. 10) Cryptocrystalline Quartz - Opaque Jasper

21. Cryptocrystalline Quartz - Opaque Bloodstone

22. 11) Cryptocrystalline Quartz - Banded Agate

23. Cryptocrystalline Quartz - Banded Black Onyx Cave Onyx

24. Cryptocrystalline Quartz - Banded Petrified Wood