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Mill Rock, Hamden, New Haven Co., Connecticut, USA

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Mill Rock is a diabase intrusive forming a 3/4-mile long, E-W trending ridge cross-cutting the Triassic New Haven Arkose. Mineralization was reported in a small quarry at the west end. Dana (1877) reports on the initial find:

"[Garnets] occur on the line of contact between the trap and the adjoining sandstone, and probably owe their origin to the metamorphic action of the heat of the erupted rock. They are found best in seams and little cavities in the trap, where they are implanted as isolated crystals upon an earlier deposit of quartz crystals. Occasional garnets of indistinct crystalline form but presumably of similar origin occur on the surfaces of the sandstone adjoining; scales of hematite produced by metamorphic action are common on the same surfaces."

At the eastern end of the ridge, Eaton (1927) reports that a small quarry (Powder Hill Quarry) uncovered prehnite and copper mineralization.

Mineral List



10 entries listed. 8 valid minerals.

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.

References

Dana, Edward S. (1877): On the occurrence of Garnets with the Trap of New Haven, Connecticut. American Journal of Science Series 3, Volume 14, page 215.

Eaton, Frederick S. (1927): Mineral Localities of Connecticut. Rocks & Minerals, vol. 2, no. 4, pp. 141-2.

Longwell & Dana. (1932): Walks & Rides in Central Connecticut and Massachusetts. p.228.

 
Mineral and/or Locality  
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