[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

No Subject

I know no body asked, but...
I found this site about lava rock:  http://www.sfmining.com/lava_rock.htm
I noticed that the black type weighed 200 lbs./ton more than the red.  A
quick call to them, and I found out that the black is less porous than the
red and hence more dense and thus weighs more per ton.  The person I spoke
with felt that there was no real chemical composition difference between
them.  He did say they were mined 300 miles apart.
Another site I found suggested that the color variance was due to the
oxidizing effect of the environment at the moment the magma comes out of the
volcano.
BTW, "lava rock" actually refers to two similar things, but very different
for our purposes.  One is magma that flows out of the volcano  and stays on
the ground [very dense, few pores] and the other refers to magma that is
blasted into the air and undergoes a very rapid expansion and cooling
falling down on top of itself in piles around the volcano.  It is these
piles that are mined to get the porous lava rock in which we are interested.
mike stoecker





---------------
See http://www.aka.org/AKA/subkillietalk.html to unsubscribe
Follow-Ups: