Central Pennsylvania Rock and Mineral Club

Central Pennsylvania Rock and Mineral Club The CPRMC, Inc. and a member of the American Federation of Mineralogical Societies. at St. December features our annual holiday party.

was established in 1958 by rock and mineral enthusiasts to: Encourage the interest, enjoyment, and appreciation of members, prospective members, and the public for rocks, minerals, gems, fossils, and the lapidary arts. The Central Pennsylvania Rock and Mineral Club, Inc is a non-profit (501c3) educational organization and is a member of the Eastern Federation of Mineralogical and Lapidary Societie

s, Inc. The general meetings of the Central Pennsylvania Rock and Mineral Club are held the second Thursday of each month, with the exception of *August and December, at 7:00 p.m. Thomas United Church of Christ, 6490 Linglestown Road (route 39), Harrisburg, PA 17112 (Rt. 39).

*The August meeting is our family picnic, which usually includes a collecting opportunity, in addition to good eats and great fellowship. Fun, food, and geology secret Santa for all who wish to participate. Both events are open to all CPRMC members and their families.

06/19/2026
https://nationalgemlab.in/triboluminescent-gems/
06/07/2026

https://nationalgemlab.in/triboluminescent-gems/

Triboluminescence The phenomenon of Triboluminescence is not fully understood, but appears to be caused by the separation and reunification of electrical charges. The term comes from the Greek word τριβείν meaning to rub and the Latin word lumen meaning light. There are only a handful of gem ...

Members only e-newsletter is out now! Reminder that there is no July newsletter so please keep an eye on your email this...
06/04/2026

Members only e-newsletter is out now!

Reminder that there is no July newsletter so please keep an eye on your email this summer for important updates

Didn't receive your newsletter? Email [email protected]

06/03/2026

It’s easy to overlook the small things in nature.

Until you look closer.

A tiny agate can hold millions of years of volcanic history, pressure, movement, and time.

That’s part of what makes rockhounding so addictive — the more closely you look, the more incredible the world starts to feel.

06/02/2026
06/01/2026

Most geodes don’t look special at all… until you crack them open. 👀

Some of the most crystal-filled treasures on Earth start out looking like ordinary dusty rocks sitting on the ground. That’s part of what makes finding one so addictive for rockhounds.

The “lighter than expected” clue surprises a lot of people too — many geodes are hollow inside, which can make them feel oddly light for their size.

05/29/2026

Vacation season is upon us! What's your favorite place to visit for specimens?

05/28/2026

The May issue of Geology covers topics including kimberlite melts, Australasian tektites, molybdenite spherules, gold deposits, methanogenesis, and enhanced oceanic phosphorus.

One article on Pele's hair has already been written up in the New York Times: geosociety.co/NewYorkTimes

See the whole issue at https://ow.ly/uWAy50Z0moe

Address

6490 Linglestown Road
Harrisburg, PA
17112

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