READ CHAPTERS 5, 6 and 19 (pages 256-263 only)
1. Define with a gem example and diagram:
Cleavage
Parting
Fracture
Tenacity
Hardness
Directional hardness
Insippient cleavage
Van der Waals bond
kerf
2. Describe, draw and diagram and provide gem examples: of these types of cleavage:
Octahedral
Prismatic
Basal
Rhomohedral
3. Describe the considerations taken by a lapidary when fashioning diamond
4. Describe 5 types of fracture and give gem example and draw a picture. How does this fracture occur?
5. How do you distinguish between fracture, a cleavage surface, and a polished facet of a gem?
6. Describe the cleavage and inspipient cleavage planes of calcite and topaz.
7. What in crystalline material causes cleavage and what causes parting?
8. Cue card the Moh's Scale
9. For the belwo gems, provide me with a CHART of:
Hardness
Cleavage/type of cleavage
Hardness
Chem. Comp
Common habit
Crystal system
2 localities
Beryl
Corundum
Diamond
Quartz
Chrysoberyl
Spinel
Garnet
DON'T HATE ME POSSE! I'VE RIPPED ALOT OF THIS FROM THE BRITISH EXAMINATIONS SO I KNOW WE NEED TO KNOW ALL OF THE ABOVE, IT WAS ASKED ON EVERY EXAM I HAD AVAILABLE IN SOME WAY!!!