From:
John Twilley <jtwilley@xxxxxxxxxxx>
Date:
Mon, 16 Jul 2001 18:26:48 -0400
Subject:
name that stone
Anthony,
Feldspars are very common and come in a wide range of
colors, white and pink being among the most common.
They are often found as rounded pebbles and cobbles.
If you're not sure of the real angles of the fractures
you might look closely to see that they are not actually
intersecting to form rhombohedra. This would be typical
of calcite. I know that you feel this is harder than
calcite but if your experience is with fine grained
material, coarser material might seem a bit harder. Last
of all, if the cleavage intersections give rise to
rhombohedra it's also possible that you are dealing with
a white dolomite. White dolomite (calcium magnesium
carbonate) is visually indistinguishable from calcite
(calcium carbonate) but it is a full step harder on the
Mhos scale. The two can be distinguished also by their
reaction to a weak acid like vinegar. Calcite dissolves
promptly with lots of bubbling while dolomite hardly
reacts at all.
John Twilley
anthony_marbella Last Name wrote:
Quoted text begins.If feldspar, would these stones be commonly used in landscaping. I'm not sure if
I pointed out that these stones, on the surface, are very smooth and white.
End of quote.
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