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It is a question of sight, not of understanding, and all the optical theories of the cause of the lustre will not help you in the least toward seeing the difference between diamond and glass, or anglesite and heavy spar.

It is often associated with blende and pyrites, and with calcite, fluorspar, quartz, barytes, chalybite and pearlspar as gangue minerals; in the upper oxidized parts of the deposits, cerussite and anglesite occur as alteration products.

In some districts cerussite and a little anglesite are also found in the oxide zone.

At Monteponi the crystals encrust cavities in glistening granular galena; and from Leadhills, in Scotland, pseudomorphs of anglesite after galena are known.

ANGLESITE, a mineral consisting of lead sulphate, PbSO4, crystallizing in the orthorhombic system, and isomorphous with barytes and celestite.