Limestone is spelled just as I have written it here. “Collect” is the correct spelling of the verb meaning to gather [NOT coolect].
Your misspelling indicates that you are a “newbie” to both geology and archeology and probably to the English language.

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Weathering can be determined by chemical changes in the surface of the sample.
Water and carbonic acid are agents of weathering in carbonates (limestone is made up of calcite, aragonite and compounds including the dolomite minerals.)

This answer should lead you to frame your question more accurately and to further understand the complex process of weathering.

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