Biotite from Philadelphia County, Pennsylvania, USA


USA
Pennsylvania Philadelphia County Philadelphia ⓘ Fairmount Park	Gordon, 1922. Mineralogy of Pennsylvania
East Falls ⓘ Ridge Avenue and School Lane Quarries	Gordon, Mineralogy of Pennsyvania, 1922 - p. 224
Frankford ⓘ Barber's Quarry	Mineralogy of Pennsylvania-1922 Samuel S. Gordon, pg. 229
ⓘ Clark's Quarry	Mineralogy of Pennsylvania-1922 Samuel S. Gordon, pg. 229
ⓘ Hoffman's Quarry (Hoffmans Quarry)	Gordon, S. G. (1922) The Mineralogy of Pennsylvania, Special Publication No. 1, The Academy of Natural Sciences of Philadelphia, p. 230.
ⓘ Quarry on Frankford Creek (unnamed)	Benge and Wherry, XIII, 1906, 92
ⓘ Germantown	Samuel G. Gordon (1922) "Mineralogy of Pennsylvania" p. 225.
ⓘ Comley's Quarry	Samuel G. Gordon (1922) "Mineralogy of Pennsylvania" p. 24
ⓘ Fowler's Quarry	Samuel G. Gordon (1922) "Mineralogy of Pennsylvania" p. 225.
Holmesburg ⓘ Holmesburg Granite Company Quarry	Gordon, "Mineralogy of Pennsylvania," 1922 p. 228.
Tacony Creek Valley ⓘ Jerry O'Neill's Quarry	Gordon: Min. Penn (1922) p. 230
ⓘ Wissahickon Valley	Gordon, 1922. The Mineralogy of Pennsylvania

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