specification:<br>
Volumetric Weight: 2690kg/m3<br>
Water-absorbtion: 0.03-0.6%<br>
Compression strength 145-174MPa<br>
Flexure strength -<br>
Attritive ability of rock 0.05-0.44g/cm2<br>
microcline 25-47&nbsp;&nbsp;&nbsp;plagioclase 20-38&nbsp;&nbsp;Quartz&nbsp;&nbsp;20-45&nbsp;&nbsp;Biotite&nbsp;&nbsp;13 other&nbsp;&nbsp;3-10