Is there any Olivine here on Earth? I hope not.
Its presents would mean that we couldn't have any water here.

Or maybe with all the water gone, the Olivine had to be left behind.
In large deposits.

Thomas Lake wrote:
> 
> Unfortunately recent findings my NASA and USGS show that large quantities of
> water likely did NOT exist on Mars in the past. This is because they discovers
> large quantities of the mineral, olivine (I think that's how you spell it),
> which is easily soluble in water. Too bad cause it would have been AMAZING to
> have discovered evidence of life on mars, not that this totally rules that out
> but it is another thing to but down in the "cons" column. Oh well there is
> always Europa still:-)
>

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