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Atacamite from Sierra Gorda, Chili

1898; Volume: 12; Issue: 54 Linguagem: Inglês

10.1180/minmag.1898.012.54.04

2515-821X

George Smith,

Geological and Geophysical Studies Worldwide

In this paper are recorded the observations made upon four exceptionally good specimens of atacamite in the British Museum, which have been submitted to careful study with tile object of determining the geometrical and physical characters of the mineral with greater accuracy than has hitherto been possible. The axial ratios have been calculated with the utmost refinement, an attempt has been made to determine the crystallographic symmetry by a study of the etched figures, and the values of the principal indices of refraction have for the first time been obtained.