1. Crystal Forms www.intenseexperiences.com/images/CaveofCrystals2.jpg

2. Crystal Forms Minerals grow into specific shapes They usually crystallize into one of 6 forms Cubic Tetragonal Hexagonal Orthorhombic Monoclinic Triclinic

3. Axes of Symmetry Lines about which a mineral can be rotated through some angle which brings the object to a new orientation which appears identical to its starting position.

4. Cubic Crystals shaped like blocks 3 axes of symmetry –All the same length –All perpendicular to each other

5. http://www.treasuremountainmining.com Cubic Example: Pyrite

6. Tetragonal Crystals shaped like four-sided prisms and pyramids. Three axes of symmetry –Two axes are the same length and lie on a horizontal plane. –The third axis is not the same length and is at a right angle to the other two. –All perpendicular to each another.

7. www.dkimages.com Tetragonal Example: Zircon

8. Hexagonal Crystals are shaped like six-sided prisms or pyramids. Four axes of symmetry –Three lie in the same plane, are the same length, and intersect at 120° angles. –The fourth axis is not the same length, and is perpendicular to other three.

9. www.palagems.com Hexagonal Example: Beryl

10. Orthorhombic Crystals are short and stubby. 3 axes of symmetry –All unequal lengths –All perpendicular to each other.

11. http://www.collectorfinejewelry.com Orthorhombic Example: Topaz

12. Monoclinic Crystals are short and stubby with tilted faces at each end. 3 axes of symmetry –All unequal lengths –Two axes lie in the same plane at right angles to each other. –The third axis is inclined.

13. http://www.galleries.com/minerals/property/gyp_flu.gif Monoclinic Example: Gypsum

14. Triclinic Crystals are usually flat with sharp edges, with no right angles. 3 axes of symmetry –All unequal lengths – None are perpendicular to one another.

15. www.yourgemologist.com Triclinic Example: Feldspar

16. Credits http://www.sdnhm.org/kids/minerals/howto -form.html (information)http://www.sdnhm.org/kids/minerals/howto -form.html www.gemsociety.org/ wow/read2.htm (form model images) http://www.georgehart.com/virtual- polyhedra/symmetry_axes.html (axes of symmetry definitionhttp://www.georgehart.com/virtual- polyhedra/symmetry_axes.html

17. ASSIGNMENT PG 63 SHOWS THE SIX MAIN CRYSTAL SYSTEMS YOU NEED TO MAKE 3- DEMENSIONAL MODELS OF THE 6 MAIN CRYSTAL SYSTEMS MAKE SURE TO LABEL EACH MODEL WITH THE SYSTEM NAME AND YOUR NAME