Re: Number of rocktypes
- From: "=?x-user-defined?q?=AB?= Paul =?x-user-defined?q?=BB?=" <" =?x-user-defined?q?=AB?= Paul =?x-user-defined?q?=BB?="@houston.rr.com>
- Date: Sat, 28 Oct 2006 02:36:46 GMT
Digby Millikan wrote:
How many rock types are there? My MacDonald Encyclopedia of Rocks and
Minerals
has 377 rocktypes including minerals. Would this be representative of the
bulk of most
of the commonly occuring rock types, or would only a 100 be commonly
occurring,
with a total of around 1000 or more different rocktypes?
No two rocks are exactly the same.
That means that there is an infinite number of rock types.
.
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- From: Digby Millikan
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