FMF - Friends of Minerals Forum, discussion and message board

[Chris Foltz]

Have been wondering how the chromium (pipe?) @ the State Line Pit formed... volcanic ?

[gemlover]

Several reports from colleges/universities and the USGS are readily available online for the Chrome deposits along the PA/MD line in Chester County PA, Cecil Co MD, Lancaster County PA and Harford County MD. Basically the area is underlain by schists and gneisses, and the village of Chrome near Oxford PA is in the "serpentine barrens" found and documented in Nottingham Park, PA (the location of one of the mines). One of the papers suggests that the mafic rocks were altered by the intrusion of sea water to cause the formation of the ore bodies; another says that the ore bodies are intrusive magmatic locoliths. One of our moderators (John) lives in York County PA near there. I collected samples in the area when I was teaching in Oxford and living in Peach Bottom, PA.

John

[Chris Foltz]

Thanks so much John,I've read some of the reports just didn't understand how the chromium formed into one (pipe ?)of nearly pure chromium ore...@ the Line Pit...just something I wonder about... what time period would this have taken place?

[Chris Foltz]

Some of the Antigorite looks like green ice ...