Delaware mineralogical society

A Delaware 501(c)(3) non-profit earth-science educational organization


C. K. Williams Quarry, Easton, PA


Delaware Mineralogical Society
Field Collecting Trip
CK Williams Quarry, Easton, Pa
DATE: Saturday, November 11, 2017
TIME: Check your Member email

This will be a joint trip with Friends of Mineral, New Jersey Chapter.

CK Williams Quarry:

This site is a metamorphic mix of a serpentine, dolomitic marble and grantic formations with serpentine dominating. The main minerals that we will find here are from the serpentine group, massive green blocks (some gemmy enough for lapidary), a complex mix of lizardite and antigorite species, talc, calcite, tremolite, and tourmaline group minerals are easy to find.

Eastonite, a new mineral, has previously been depicted as a variety of phlogopite but is a submicroscopic mixture of phlogopite and serpentine. It occurs in a lovely shimmering shade of green. Asbestos fibers on serpentine and titanite crystals in pegmatitic breccias have also been readily found. For those of you who like radio active minerals bring your Geiger counters with you! There are some “hot” minerals reported in the southern end of this road-side quarry.

We’ve previously visited this site. Here’s the 2011 trip report:

Bad weather forecast during the preceding week with snow early Friday, but the weather finally cleared and Teddi, Donna, Bill and I spend a wonderful day at the CK Williams Quarry. We arrived at 10 and started collecting eastonite, tremolite, and phlogopite at the ‘ground’ level.

Though this area is heavily visited there is still a lot of very nice material both on the ground and on the quarry face. We also collected some asbestos and Bill found a few large verdolite boulders.

Later Donna, Bill and I went ‘up the hill’ to the mid-level flat area and searched through the endless supply of loose rock left over from the mining operation. Donna found a fantastic verdolite; rich rose red with nice green serpentine. Late in the day I found some ca. 3”, bright silver, folded, phlogopite specimens. We left the quarry about 3:30

And here’s the 2013 trip report:
We visited CK Williams Quarry, Easton, Pa on Saturday, April 14. The weather was warm, partly sunny and dry, the trees had leafed out but the grass and other foliage was not so thick that getting about was difficult. All together 14 club members attended the outing.

We collected at several locations within the quarry, which included the south draw, across the east-facing wall between the draws, along the east-facing wall north of the center draw and across the road on the bank of the Delaware River. I don’t think anyone went up the central draw, or collected at the bench where the draws meet halfway up the hill, or in the cave.

A variety of minerals were collected, mostly in the serpentine family. Several large green and white boulders of containing tremolite and eastonite were sledge-hammered apart and everyone got fine specimens, with plenty left over for Jr. Booth sales. CK Williams has a lot of interesting rocks of a variety of patterns and colors, including the locally famous verdolite, and many were collected, including a few 100+ lb boulders of serpentine-eastonite. Several specimens of the harder-to-find minerals were also found by Mark including thorite (red coating) and thorian uraninite (both confirmed with a calibrated Geiger counter), and tremolite-asbestos by Wayne Urion. Later in the afternoon Ken, Wayne and Tom (and Wayne and Tom a week later) went about halfway up the south draw to collect 1”-6” mica books. This mica is very shiny silver, some has a green tinge, and we think it’s either eastonite or phlogopite; samples have been sent for analysis. The previous night, Friday, Tom lamped the easily accessible parts of the quarry looking for fluorescent minerals and found red and pink-fluorescing feldspar, large areas of surface coating that fluoresced green (possibly uranium minerals), and 1 specimen of green-fluorescing quartz crystals. These later areas were the same as where Mark found his radioactive specimens.

We finished collecting late afternoon and everyone’s trunk was loaded with boxes and buckets of fine specimens.


You will need to bring your steel toed boots, hard hat, gloves and goggles. Bring rock hammers, pry bars, small sledges (2-5 lb range), a large sledge, wrapping material and flats. Also bring snacks and drinks if you want.

Sign-up: Contact Tom Pankratz by email ( if you would like to attend this event. I will confirm your reservation by return email within a day or two. If you do not get the confirmatory email, recontact me. Like a boss.