TABLE OF HARDNESS AND
SPECIFIC GRAVITY.

 
  HARDNESS. SPECIFIC
GRAVITY.
Achroite 7. — 7.5  3. — 3.1
Alexandrite 8.5     3.65 — 3.8
Almandine 7.5     4. — 4.2
Almandite 7.5     4. — 4.2
Amber 2. — 2.5 1.065 — 1.08
Apatite 4.5 — 5. 2.95 — 3.25
Axinite 6.5 — 7. 3. — 3.3
Beryl 7.5 — 8. 2.67 — 2.73
Bobrowska garnet 6.     3.85    
Bohemian" 7.5     3.69 — 3.78
Brazilian emerald 7. — 7.5 3. — 3.1
"   sapphire 7. — 7.5 3. — 3.1
Cachelong 5.5 — 6. 2. — 2.1
Cat’s-eye 8.5     3. — 3.8
Ceylon chrysolite 7. — 7.5 3. — 3.1
  "peridot 7. — 7.5 3. — 3.1
Chrysoberyl 8.5     3.65 — 3.8
Chrysolite 6.5 — 7. 3.3 — 3.5
Chrysoprase 7.     2.56    
Cinnamon stone 6.5     3.5 — 3.56
Cyanite 5. — 7. 3.45 — 3.7
Cymophane 8.5     3.65 — 3.8
Demantoide 6.     3.85    
Diamond  10.     3.5 — 3.6
Dichroite 7. — 7.5 2.56 — 2.67
Diopside 5. — 6. 2.9 — 3.5
Emerald 7.5 — 8. 2.67 — 2.73
Epidote 6. — 7. 3.32 — 3.50
Essonite 6.5     3.5 — 3.56
Euclase 7.5     3.1  
Fluor spar 4.     3.1 — 3.2
Garnet 5. — 8. 3.15 — 4.3
Grossularite 6.5     3.5 — 3.56
Hematite 5.6 — 6.5 4.2 — 5.3
Hiddenite 6.5 — 7. 3.13 — 3.19
Hyacinth 7.5     4.4 — 4.7
Hydrophane 5.5 — 6. 2. — 2.1
Hypersthene 6.     3.3 — 3.4
Idocrase 6.5     3.35 — 3.45
Indicolite 7. — 7.5 3. — 3.1
Jacinth 7.5     4.4 — 4.7
Jargoon 7.5     4.4 — 4.7
Jasper 7.     2.31 — 2.67
Jet 2.5     1.35    
Labrador 6.     2.62 — 2.76
"hornblende   6.     3.3 — 3.4
Lapis lazuli 5. — 5.5 2.38 — 2.42
Malachite 3.5 — 4. 3.6 — 4.
Moonstone 6. — 6.5 2.4 — 2.6
Obsidian 6. — 7. 2.25 — 2.8
Olivine 6.5 — 7. 3.3 — 3.5
Opal 5.5 — 6. 2. — 2.1
Oriental amethyst 9.     3.9 — 4.1
"  aquamarine 9.     3.9 — 4.1
"  chrysolite 9.     3.9 — 4.1
"  emerald 9.     3.9 — 4.1
"  hyacinth 9.     3.9 — 4.1
"  topaz 9.     3.9 — 4.1
Pearl       2.5 — 2.7
Peridot 6.5 — 7. 3.3 — 3.5
Phenacite 7.5 — 8. 2.96 — 3.
Pyrope 7.5     3.69 — 3.78
Quartz 7.     2.5 — 2.8
  "  cat’s-eye 6. — 6.5 2.65    
Rose quartz 7.     2.65 — 2.75
Rubellite 7. — 7.5 3. — 3.1
Ruby 9.     3.9 — 4.1
  "  cat’s-eye 9.     3.9 — 4.1
Sapphire 9.     3.9 — 4.1
"  cat’s-eye 9.     3.9 — 4.1
Siberite 7. — 7.5 3. — 3.1
Sphene 5. — 5.5 3.4 — 3.56
Spinel 8.     3.5 — 3.6
Spodumene 6.5 — 7. 3.13 — 3.19
Star ruby 9.     3.9 — 4.1
  "  sapphire 9.     3.9 — 4.1
  "  topaz 9.     3.9 — 4.1
Sunstone 6. — 7. 2.56 — 2.72
Syrian garnet 7.5     4. — 4.42
Titanite 5. — 5.5 3.4 — 3.56
Topaz 8.     3.4 — 3.6
Tourmaline 7. — 7.5 3. — 3.1
Turquois 6.     2.6 — 2.8
Uwarowite 7.5     3.41 — 3.52
Vesuvianite 6.5     3.35 — 3.45
Water sapphire 7. — 7.5 2.56 — 2.67
 

GENERAL INDEX.