specification:<br>
Volumetric Weight: 2650kg/m3<br>
Water-absorbtion: 0.13%<br>
Compression strength 160MPa<br>
Flexure strength 24MPa<br>
Attritive ability of rock 0.13g/cm2<br>
microcline 30-45&nbsp;&nbsp;&nbsp;&nbsp;plagioclase 25-35&nbsp;&nbsp;Quartz 2-5&nbsp;&nbsp;Biotite 5-10 other NIL