Serpentine Subgroup from Lancaster County, Pennsylvania, USA

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USA
Pennsylvania Lancaster County Fulton Township ⓘ Cedar Hill Quarry (Stoltzfuss Quarry)	[var. Picrolite] Lapham & Geyer, 1965: Mineral Collecting in PA
ⓘ Haines & Kibblehouse Penn-Maryland Materials Quarry	Personally Collected 4/12/2008, Mark J. Sigouin, Pennsylvania Licenced Professional Geologist
ⓘ Jenkins Mine (Jenkins Corner; North Rock Springs)	Pearre, N. C., Van Heyl, A. (1960) Chromite and other mineral deposits in serpentine rocks of the Piedmont Upland, Maryland, Pennsylvania, and Delaware. Bulletin Vol. 1082 (1082k) US Geological Survey doi:10.3133/b1082k A.Mathauser collection
ⓘ Line pit (Lowe's Chromite Mine)	The Mineralogy of Pennsylvania, 1875-1922 Samuel G. Gordon, Pg. 204. Dana 6:1069. Ref2) American Republican, Jan. 2nd 1849 (Chester Co., Newspaper)
ⓘ Red Pit Mine	Geyer, A.R., Smith, R.C., Barnes, J.H. (1976) Mineral collecting in Pennsylvania (4th ed.). Commonwealth of Pennsylvania, Department of Environmental Resources, Topographic and Geologic Survey, 260 pages, at pp.154-155.
ⓘ Rock Springs Run	Mineralogy of Pennsylvania-1922 Samuel S. Gordon, pg. 204
ⓘ Wet Pit Slaymaker Property	(2005) Mineral Resources Data System (MRDS), US Geological Survey.
Little Britain Township ⓘ Carter's Chrome Mine	Mineralogy of Pennsylvania-1922 Samuel S. Gordon, pg. 206
ⓘ Geiger Quarry	Rocks & Min.: 20:530.
Texas ⓘ Wood's Chrome Mine	[var. Marmolite] Dana 6:1069.