The Mineralogy of Pennsylvania

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20 12. 69 98. 22 100. 12 99. 10 99. 48 JEFFERISITE' Color: dark yellowish-brown, to light yellow. Luster: pearly on cleavage surfaces. Translucent. Form: broad crystals or crystalline plates. Cleavage: basal, eminent; laminae flexible, inelastic. H = 1 . 5. Sp. Gr. 2 . 30.
Optical properties: Plates are generally twinned. Plane of optic axes coincides with the shorter diagonal of the prisms. Double refraction strong, . Axial angles varies from 10-27, some plates are apparently uniaxial. Dispers
...ion slight, p

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