Pumice, Fine Granule

Porosity:

Up to 90 %

Specific Gravity:

2.30 – 2.35

Hardness:

5.5

pH:

7.2

Loss on Ignition:

5 %

Silicon Dioxide:

70.5 %

Aluminum Oxide:

13.5 %

Formation:

Volcanic glass formed by the solidification of lava that is permeated with gas bubbles.

Constituents:

Silicon dioxide, and may contain silicates and oxides of aluminum, potassium, sodium, iron,calcium, magnesium and titanium.