Black Star Marble

Dark grey marble, with lighter grayish zones, medium granularity.
PHYSICAL-MECHANICAL CHARACTERISTICS
- Compressive strength - 863 kg/cm2
- Compressive strength after freeze/thaw cycles - 977 kg/cm2
- Flexural strength - 256 kg/cm2
- Apparent density - 2 703 fg/m3
- Water absorption at atmospheric pressure - 0.10 %
- Open porosity - 0.28 %
- Coefficient of linear thermal expansion - 14.8 x 10-6 / ºC
- Abrasion resistance - 2.0 mm
- Shock resistance: minimum height of fall - 55 cm
CHEMICAL ANALYSIS
SiO2-------------------------------------------------------------- 0.36 %
Al2O3------------------------------------------------------------ 0.69 %
Fe2O3 (total)--------------------------------------------------- 0.11 %
MnO-------------------------------------------------------------- vest.
CaO-------------------------------------------------------------- 53.89 %
MgO-------------------------------------------------------------- 0.99 %
Na2O------------------------------------------------------------- 0.04 %
K2O-------------------------------------------------------------- 0.06 %
TiO2------------------------------------------------------------- 0.00 %
L.O.I.------------------------------------------------------------- 43.47 %