Was $4.00 Now $3.25 Small size |
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Was $6.50 Now $5.25 Large size |
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M249 - Utah
Pumice (Latin:
"foam") is a frothy volcanic rock. As is a bath sponge the
whole mass is riddled with pores of irregular or oval shape which are
usually not connected with one another. Because of the high pore
volume, which can reach 85%, pumice FLOATS ON WATER. |
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Discounted 25% off
EXCELLENT PRICES
Pumice develops in lava
which is rich in gases and viscous. The gases, released because of a
sudden diminution of pressure at the Earth's surface, create the many
cavities. Shortly afterwards the lava solidifies. Since acidic lavas
are especially viscous they are favorable for the formation of pumice.
Accordingly most pumices have a high silica content and light colors.
They are thus assigned to the rhyolite family. |
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