Here's a whole booklet about exploring beaches.
It says that beach sand has mostly quartz and
calcium carbonate as its minerals. You can see
some light through grains of quartz. Calcium
carbonate is usually white. It comes from sea
shells. There are other minerals, too. We used
magnets to pick up sand grains containing iron
from the sand of some beach in California. Mica
is another mineral that can be found in sand. I
found it in some river sand in Alaska. Mica is
shiny, and grains of mica are made up of stacks of
very very thin mineral sheets. The sheets are so
thin that there are a million sheets in a piece of
mica that's only 1 mm [millimeter] thick.
Enjoy your beach trip.
I would say by far the dominant mineral on
typical beaches (re. not carbonate beaches like in
the bahamas) is quartz. This is the same mineral
that can be made into glass, however, on beaches
it's not sharp because millions of years of
weathering and erosion and re-working from waves
makes the sand grains small and rounded.
But yes, depending how well sorted a beach is
(dependent on how much wave action there is on the
beach and source of the sediments material), there
may also be calcite (carbonate from shells) and
what we call "lithic fragments" (any other mineral
that's been ground up and has survived
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