Hardness
Grain Size
Fracture
Streak
Porosity
Luster
Compressive Strength
Cleavage
Toughness
Specific Gravity
Transparency
Density
Specific Heat Capacity
Resistance
Grainy, Pearly and Vitreous
Heat Resistant, Pressure Resistant, Wear Resistant
Dull to Pearly to Subvitreous