Described first as "Chloritic Vermiculite" by Clarke and Schneider in 1891. Likely the same material as described by professor Frederick Burritt Peck in 1905 as an "alteration of phlogopite to serpentine", noting specimens from both Chestnut Hill and from the continuation of the serpentine belt at Warne's quarry (Royal Green Quarry), across the Delaware river in Phillipsburg, New Jersey. Analysis by Merril and by Eyerman in 1911.
Habit:
Rough crystals, cleavage masses. Laminae flexible but inelastic
Colour:
Silvery white to bright yellowish green, vitreous with pearly luster
Luminescent properties:
none
Quality for species:
Excellent - world class for species or very significant. (!!)
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Representative, Weston Media Associates. 184 Judd Road, Easton. CT 06612, U.S.A. (Telephone 203 261 2500). Indexed...Geochemistry of the Tioueine Pan-African Granite Complex (Hoggar, Algeria) : A. Azzouni-Sekkal and J . Boissonnas...Marseille, France; F. B. Van H outen, Princeton, USA; R. T. Watkins, Cape Town, South Africa; J. A. Weir...described above developed as an evolving volcanic complex on pri,nitive Archaean simatic crust. to be subsequently...supracrustal pile devoid of structural breaks; Williams and Furnell (1979) reported that the southern
Sherrer Quarry, C.K. Williams Quarry complex, Chestnut Hill, Easton, Northampton County, Pennsylvania, USA