After reading up a bit on the Olivine theory, these are the issues I
have with it:

1. Olivine occurs naturally in much of the world, however,as your link
to the publication suggested it should only be done in 'wetter'
environments. When I looked up the deposits around the world, these
were the listed countries' deposits:

Large deposits of olivine-bearing dunites crop out in Norway, Sweden,
USSR, Austria, Japan, New Zealand, Zimbabwe, South Africa, United
States, New Caledonia, Italy, Greece, Spain, India, Brazil, and Canada
(Anon., 1970, Bennett, 1940; Brothers, 1960; Du Rietz, 1935; Francis,
1956; Gwinn, 1943; Hunter, 1941; Ragan, 1961; Roberts, 1947; Yudin,
1959).

In the United States, numerous lenslike bodies extend in a belt from
northeastern Georgia, northeastward across western North Carolina.
Some 25 of these deposits are relatively fresh, with each containing
up to five million tons of recoverable olivine.

Many small to large dunite bodies occur in northwestern Washington,
with the Twin Sisters deposit being the largest.

Taylor (1967) describes eight zoned ultramafic complexes in
southeastern Alaska containing cores of dunite. Some of these olivine
cores are as great as one mile in diameter.

Almost all of these countries other than Brazil are out of the
'wetter' climates. In my humble opinion, I think Humans have had
ENOUGH environmental impact on the Brazillian/Amazonian Rainforest for
many generations to come.


PD
source: http://books.smenet.org/Surf_Min_2ndEd/sm-ch02-sc10-ss18-bod.cfm

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