 |
DIAMOND
|
10
|
|
Composition > C
Crystal class > Isometric
SP Grav. > 3.51
Streak > colorless
Luster > adamantine
Color > colorless, yellow or smokey tinted, fancy colors, black |
 |
CORUNDUM
|
9
|
|
Composition > Al2O3
>>> SAPPHIRE & RUBY
Crystal class > Hexagonal
SP Grav. > 3.95-4.1
Streak > colorless
Luster > adamantine to vitreous
Color > colorless & almost any color |
 |
TOPAZ
|
8
|
|
Composition > Al2SiO4(F,OH)2
Crystal class > Orthorhombic
SP Grav. > 3.4-3.6
Streak > colorless
Luster > vitreous
Color > colorless, blue, green, pink, yellow, orange |
 |
QUARTZ
|
7
|
|
Composition
> SiO2 >>> AMETHYST & CITRINE
Crystal class > Hexagonal
SP Grav. > 2.65
Streak > colorless
Luster > vitreous
Color > colorless or any color due to mineral impurities |
 |
ORTHOCLASE
|
6
|
|
Composition > KAlSi3O8
Crystal class > Monoclinic
SP Grav. > 2.57
Streak > .white
Luster > vitreous
Color > colorless, white, grey |
 |
APATITE
|
5
|
|
Composition > Ca5(PO4)3(F,CL,OH)
Crystal class > Hexagonal
SP Grav. > 3.15 - 3.20
Streak > colorless
Luster > vitreous to subresinous
Color > green or brown, also blue, violet, colorless |
 |
FLUORITE
|
4
|
|
Composition > CaF2
Crystal class > Isometric
SP Grav. > 3.18
Streak > colorless
Luster > vitreous
Color > colorless, violet, green, pink |
 |
CALCITE
|
3
|
|
Composition > CaCO3
Crystal class > Hexagonal
SP Grav. > 2.71
Streak > colorless
Luster > vitreous to earthy
Color > white to colorless, variously tinted |
 |
GYPSUM
|
2
|
|
Composition
> CaSO4'2H2O
Crystal class > Monoclinic
SP Grav. > 2.32
Streak > colorless
Luster > vitreous, pearly and silky
Color > colorless, white, grey, shades of yellow, red, brown |
 |
TALC
|
1
|
|
Composition
> Mg3Si4O10(OH)2
Crystal class > Monoclinic
SP Grav. > 2.7-2.8
Streak > colorless
Luster > pearly to greasy
Color > apple green, grey, white or silver white |
|
ME