1) a) Define Density

   b) Define Specific Gravity

   c) Which is a relative value, and which is and absolute?

   d) Define Atomic weight

2)a) Name 4 methods of finding specific gravity.

  b) Name an advantage and a disadvantage to each.

3)a) Draw a Direct Reading Specific Gravity Balance and label the parts.

  b) Give the steps used in using the Direct-Reading SG Balance.

4)For the following elements, chart their name, possible valencies,

atomic weight and a gem material they're found in (natural OR

synthetic):

Al, Be, K, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, H, O, Si, B, Ca, C, P, Zr.

5) Name 3 factors can influence the specific gravity of a substance?

6)For the following groups of gemstones, chart their chemical

composition, specific gravity, hardness, crystal system and common

habit(s):

a) Emerald & Aquamarine

b) Ruby & Blue sapphire & Colourless Sapphire

c) Rock crystal & Amethyst & Citrine & Chalcedony & Jasper

d) Hematite & Pyrite

e) Jadeite & Nephrite & Serpentine

f) Spinel & Synth, Spinel

g) Garnets - Pyrope & Almandine & Spessartite

h) Garnets - Uvarovite & Grossular & Andradite

i) Diamond, CZ, Synth. Moissonite, YAG, GGG, Synth. Rutile, Strontium

titanate

7) For the following groups what may account for the

differences (if any) in specific gravity?

a) Emerald & Aquamarine

b) Ruby & Blue sapphire & Colourless Sapphire

c) Rock crystal & Amethyst & Citrine & Chalcedony & Jasper

d) Hematite & Pyrite

e) Garnets - Pyrope & Almandine & Spessartite

f) Diamond, CZ, Synth. Moissonite, YAG, GGG, Synth. Rutile, Strontium

titanate