Minerals

2. the way that a mineral reflects light from its surface; two main types - metallic and nonmetallic
4. a pure substance that cannot be broken down into simpler substances by chemical or physical means
7. minerals that contain silicon, oxygen, and usually one or more other element
10. the manner in which a mineral breaks along planes where atomic bonding is weak
11. a measure of how easily a mineral can be scratched, which is determined by the arrangement of a mineral's atoms
12. the color a mineral leaves when it is rubbed across an unglazed porcelain plate or when it is powdered

1. forms when a mineral breaks into pieces with arc-like, rough, or jagged edges
3. a mineral or rock that contains a valuable substance that can be mined at a profit
5. a naturally occurring, inorganic solid with a specific chemical composition and a definite crystalline structure
6. a geometric solid having four sides that are equilateral triangles
8. a solid in which atoms are arranged in repeating patterns
9. rare, precious, highly prized minerals that can be cut, polished, and used for jewelry