Calcite concretion, "fairy stone" , Quebec, Canada, occur in Quaternary deposits settled in lakes left by receding glaciers
Calcite concretion, "fairy stone" , Quebec, Canada, They occur in loose Quaternary deposits, having settled in lakes left by receding glaciers and are considered to be calcite after clay pseudomorphs. It is believed these concretions developed in a permeable layer within the deposits through which water slowly filtered and circulated. The water of percolation, high in carbon dioxide, probably dissolved the classic limestone, and the concentration of the resulting solution continued to increase until the limestone was deposited, thus producing the concretions.
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