Perlite
Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently. It is an industrial mineral and a commercial product useful for its light weight after processing.
Properties
Perlite softens when it reaches temperatures of 850–900 °C (1,560–1,650 °F). Water trapped in the structure of the material vaporises and escapes, and this causes the expansion of the material to 7–16 times its original volume. The expanded material is a brilliant white, due to the reflectivity of the trapped bubbles. Unexpanded ("raw") perlite has a bulk density around 1100 kg/m3 (1.1 g/cm3), while typical expanded perlite has a bulk density of about 30–150 kg/m3 (0.03-0.150 g/cm3).
Typical analysis of perlite
Podcasts:
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by Prelude
After The Goldrush
by: PreludeWell I dreamed I saw the knights in armour coming saying something about
a queen
There were peasants singing and drummers drumming and the archer split
the tree
There was a fanfare blowing to the sun that was floating on the breeze
Look at mother nature on the run in the nineteen-seventies
I was lying in a burned out basement with a full moon in my eyes
I was hoping for a replacement when the sun burst through the skies
There was a band playing in my head and I felt like getting high
I was thinking about what a friend had said I was hoping it was a lie
Thinking about what a friend had said I was hoping it was a lie
Well I dreamed i saw the silver spaceships flying in the yellow haze of
the sun
There were children crying and colors flying all around the chosen one
All in a dream, all in a dream the loading had begun
They were flying mother nature's silver seed to a new home in the sun
Flying mother nature's silver seed to a new home in the sun