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Across 4. least reliable clue of a mineral's identity 6. breaking with rough and jagged edges 7. minerals that can be mined for a profit 11. the way a mineral reflects light from its surface 14. a solid in which the atoms are arranged in a repeating pattern 15. the manner in which a mineral breaks along planes 16. minerals that contain silicon and oxygen 18. when a liquid becomes full of a dissolved substance and can dissolve no more 21. valuable minerals that are prized for their rarity and beauty 24. streak color made by hematite 26. Mg 28. Si 29. K 32. Ca 34. a naturally occurring, inorganic solid, with a specific composition and crystalline structure 35. ratio of a material's mass to its volume

Down 1. describes how a mineral feels to the touch 2. Fe 3. example mineral on the hardness scale with a rating of 6 5. minerals composed of oxygen and a metal 8. the color of a mineral when it is broken up and powdered 9. the measure of how easily a mineral can be scratched 10. SiO2 (silicon dioxide) 12. ratio of the mass of a substance to the mass of an equal volume of water at 4°C (2 Words) 13. a geometric solid having four sides that are equilateral triangles 17. minerals composed of one or more metallic elements and the carbonate ion 19. Al 20. O 22. molten material that forms below Earth's surface 23. softest mineral on the hardness scale with a rating of 1 25. hardest mineral on Earth 27. minerals composed of elements with the sulfate ion 30. Na 31. C 33. scale of hardness