Clark Hill Quarries are composed off two (maybe three) different quarries (State Forest Quarry #1 and Nathan Hall Quarry: Warren Anderson has entered a good description of these quarries under the Discussion pages:
A comment I had read from the from the Boston Club said they had found their niciest specimens at the Clark Hill Quarries over the past couple of years. Clark Hill contains 2 quarries State Forest #1 and the Nathan Hall Quarry -they are about 1,000 feet apart, also a new digging area was uncovered within 500 ft. Gem quality beryl, nice garnets , fluorapatite and many other minerals can be found. Quarry #1 also has many phosphate minerals.
Mindat.org mineral listings for the two quarries:
Nathan Hall Quarry
var: Ferruginous Quartz
var: Rose Quartz
var: Smoky Quartz
See http://www.mindat.org/loc-9660.html and http://www.mindat.org/loc-29586.html for more detailed descriptions of the two quarries.
This trip pending approval for permit to collect submitted to CT Geol Survey.