Minerals

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ACROSS
2. Overfilled.
4. A mineral is an ____ if it contains a useful substance that can be mined at a profit.
5. Specific gravity depends on the ____ of a mineral.
7. Molten material found beneath Earthís surface.
10. These interactions between atoms help determine several mineral properties, including the way a mineral splits.
12. These arenít alive and never were alive during any part of their existence.
17. Minerals that break with rough or jagged edges are said to have ____.
18. This has a definite shapes and volume.
20. This mineral family is compounds of oxygen and a metal (examples: hematite and magnetite).
22. A solid in which the atoms are arranged in repeating patterns.
23. A German geologist developed this scale in which an unknown mineralís hardness can be compared to the known hardnesses of ten minerals.
25. This mineral family is composed of elements combined with the compound SO4 (example: anhydrite).
26. A naturally occurring, inorganic solid with a specific chemical composition and a definite crystalline structure.
27. A unique kind of fracture with arclike patterns resembling clam shells.
28. One silicon atom attaches to four oxygen atoms to form a silica ____ (a three-dimensional shape structured like a pyramid).
29. The way that a mineral reflects light from its surface (described as being either metallic or nonmetallic).
DOWN
1. This mineral family is composed of one or more metallic elements combined with the compound CO3 (examples: limestone, coquina, and marble).
3. Solidify out of solution.
6. Minerals that contain silicon and oxygen, and usually one or more other elements.
7. This mineral is an example of a sheet tetrahedron, and separates easily into sheets.
8. Halite has ____ cleavage, which means that it breaks in three directions along planes of weak atomic attraction.
9. One of the most noticeable characteristics of a mineral, but generally one of the least reliable clues to a mineralís identity.
11. This mineral family is compounds of sulfur and one or more elements (example: pyrite).
13. A ____ is a valuable minerals that is prized for its rarity and beauty (examples: rubies, emeralds, and diamonds).
14. A ____ element is made up of one element only (examples: silver or copper).
15. This mineral (CaCO3) fizzes when it comes into contact with hydrochloric acid (HCl).
16. A measure of how easily a mineral can be scratched.
18. The color of a mineral when it is broken up and powdered (sometimes, this does not match the mineralís external color).
19. A form of magnetite that will pick up nails like a magnet.
21. This mineral represents 10 on the Mohs scale of hardness.
24. This mineral fmaily is made up of chloride or fluoride along with calcium, sodium, or potassium (examples: halite).