Mark Heintzelman's Gallery

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Actinolite : ☐Ca2(Mg,Fe2+)5(Si8O22)(OH)2
	French Creek Mines, St. Peters, Warwick Township, Chester Co., Pennsylvania, USA Bladed Actinolite with minor Malachite and limonite coatings (the extent to which both species occur at this site). Several di-pyramidal pyrite crystals, to 7mm, are also present on the specimen. Specimen from the French Creek Mine, St. Peters, Chester Co., Pennsylvania. Specimen size: 9 x 6.5cm. From the PA Annex of my personal collection, ...
© M.Heintzelman	Photo ID: 98468    View Count: 297
Actinolite : ☐Ca2(Mg,Fe2+)5(Si8O22)(OH)2
	Williamson Trade School, Middletown Township, Delaware Co., Pennsylvania, USA An aggregate of gemmy green crystals of Actinolite from the classic locality of the Williamson Trade School, Elwyn, Middletown Township, Delaware Co., Pennsylvania. Specimen size: 7.5 x 4.5cm. From the PA Annex of my personal collection, acquired in 2003.
© M.Heintzelman	Photo ID: 39347    View Count: 638
Actinolite (Var: Byssolite) : ☐Ca2(Mg,Fe2+)5(Si8O22)(OH)2
	Keystone Trap Rock Quarry, Cornog, Wallace Township, Chester Co., Pennsylvania, USA Green fiberous mass of hairlike crystals of Actinolite var. Byssolite. Specimen is from the Keystone traprock Quarry, Cornog, Chester Co., Pennsylvania, Specimen size: 3.3 x 4cm. From the PA Annex of my personal collection, acquired in 2003.
© M.Heintzelman	Photo ID: 15516    View Count: 565
Actinolite (Var: Byssolite) : ☐Ca2(Mg,Fe2+)5(Si8O22)(OH)2, Adularia : KAlSi3O8
	Keystone Trap Rock Quarry, Cornog, Wallace Township, Chester Co., Pennsylvania, USA Masses of elongated green fiberous Tremolite var. Byssolite, enveloping clusters of Adularia crystals. Specimen is from The Keystone Trap Rock Quarry, Cornog, Chester Co., Pennsylvania. Specimen size: 6 x 4 cm. From the PA Annex of my personal collection, acquired in 2006.
© M.Heintzelman	Photo ID: 138948    View Count: 239
Actinolite (Var: Byssolite) : ☐Ca2(Mg,Fe2+)5(Si8O22)(OH)2, Chalcopyrite : CuFeS2, Pyrite : FeS2, Magnetite : Fe2+Fe3+2O4
	French Creek Mines, St. Peters, Warwick Township, Chester Co., Pennsylvania, USA Fiberous, hair-like Actinolite, variety Byssolite with brassy yellow crystals of Chalcopyrite, silvery dipyrmidal crystals of Pyrite and platy Magnetite. A classic association specimen from the French Creek Mine, St. Peters, Chester Co., Pennsylvania. Specimen size: 4 x 4.5cm. From the PA Annex of my personal collection, acquired in 2003.
© M.Heintzelman	Photo ID: 15521    View Count: 654
Adularia : KAlSi3O8, Actinolite (Var: Byssolite) : ☐Ca2(Mg,Fe2+)5(Si8O22)(OH)2
	Keystone Trap Rock Quarry, Cornog, Wallace Township, Chester Co., Pennsylvania, USA Intergrown cluster of Adularia crystals in association with green fiberous Actinolite var. Byssolite, typical for the locale. Specimen is from The Keystone Trap Rock Quarry, Cornog, Chester Co., Pennsylvania. Specimen size: 3 x 3.5cm. From the PA Annex of my personal collection, acquired in 2005.
© M.Heintzelman	Photo ID: 31790    View Count: 507
Oligoclase (Var: Sunstone) : (Na,Ca)[Al(Si,Al)Si2O8]
	Mineral Hill, Elwyn, Middletown Township, Delaware Co., Pennsylvania, USA Specimen of green Oligoclase variety Sunstone. Specimen collected in the vicinity of Mineral Hill, Elwyn, Middletown Township, Delaware Co., Pennsylvania. Older specimen, originally from the Jay Lininger collection. Specimen size: 7 x 6.4cm. From the PA Annex of my personal collection, acquired in 2005.
© M.Heintzelman	Photo ID: 39346    View Count: 605
Allanite
	Keystone Trap Rock Quarry, Cornog, Wallace Township, Chester Co., Pennsylvania, USA Black, largely cleaved crystals of Allanite in a matrix of massive bluish Quartz. Specimen is from The Keystone Trap Rock Quarry, Cornog, Chester Co., Pennsylvania. Originally from the Robert M. Eisenhauer collection. Specimen size: 8.7 x 6.5 cm. From the PA Annex of my personal collection, acquired in 2006.
© M.Heintzelman	Photo ID: 138956    View Count: 222
Almandine : Fe2+3Al2[SiO4]3
	Behr Garnet Mine, Chelsea, Bethel Township, Delaware Co., Pennsylvania, USA Bright red Almandine garnets, a specimen of very garniferous Gabbro, collected near the site of the old Behr Garnet Mine, Delaware Co, Pennsylvania. Larger crystals of a beautiful "Pigeon blood" red were collected at this site in the late 19th century. Specimen size: 7.4 x 5.5cm. From the PA Annex of my personal collection, acquired in 2005.
© M.Heintzelman	Photo ID: 50304    View Count: 470
Almandine : Fe2+3Al2[SiO4]3
	Deshong's Quarry, Leiperville, Ridley Township, Delaware Co., Pennsylvania, USA Large red Almandine Garnet, a single complex crystal measuring 1.5 inch across, in pegmatite matrix. Specimen from Deshong's Quarry, Leiperville, Ridley Township, Delaware Co., Pennsylvania (Dana locale). These large red garnets are well noted at many localities throughout Delaware County. Older collection specimen, acquired from the Jay Lininger ...
© M.Heintzelman	Photo ID: 31817    View Count: 737

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