black volcanic lapillo in the piece 10-18 mm, in bags of 25 kg / 33 liters or big bags of 1.5 mc.
material destination
thermal and acoustic insulation;
drainer for land-based land;
fine for land:
backgrounds for sports fields (football, tennis, etc.);
mulching;
crops out of the ground.
average physical-chemical characteristics:
water available from 5 to 8% in volume;
free from limestone;
water retention: from 7 to 12% in volume;
c.s.c.: about 18 meq/100 mg;
average chemical analysis:
mgo 3.2%
=
na2o 2.1%
tio2 0.7%
k2o 5.0%
fe203 6.5%
cao 8.7%
sio2 55%
ai203 16.3%