Hardness
Grain Size
Fracture
Streak
Porosity
Luster
Compressive Strength
Cleavage
Toughness
Specific Gravity
Transparency
Density
Specific Heat Capacity
Resistance
Medium to Fine Coarse Grained
Crenulation and Pervasive
Heat Resistant, Impact Resistant
Medium to Fine Coarse Grained
Dull to Pearly to Subvitreous
Heat Resistant, Pressure Resistant