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An an overview of Cape Cod geology is provided by the National Park service website:
"Most of Cape Cod was shaped by the last great glaciation in North America, the Wisconsin glacial stage of the Pleistocene, approximately 75,000 to 10,000 years ago. A vast ice sheet (the Laurentide ice sheet) advanced south from northern New England and Canada and transported eroded rock debris scoured from the underlying Paleozoic crystalline bedrock until it reached its southernmost limit at Martha's Vineyard and Nantucket Island. Late in this time period, the coalescing Buzzard's Bay, Cape Cod Bay, and South Channel glacial lobes of the Laurentide ice sheet deposited the glacial drift that now comprises much of Cape Cod." 
Mineral ListMineral list contains entries from the region specified including sub-localities
5 entries listed. 2 valid minerals.
Localities in this Region
The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.