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Encyclopedia Britannica - Main :: APO-ARN |
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APOPHYLLITE , a mineral
mineral
Apophyllite always occurs as distinct crystals, which belong to the tetragdilal system. The form is either a square prism terminated by the basal planes (fig. 2), or an acute pyramid (fig. I). A promi- nent feature of the mineral is its perfect basal cleavage, on which the lustre is markedly pearly, present- ing, in white crystals, some- what the appearance ofthe eye of a fish after The optical characters of the mineral are of special
interest
double
Apophyllite is a mineral of secondary origin, commonly occurring, in association with other zeolites, in amygdaloidal cavities in basalt and melaphyre. Magnificent groups of greenish and colourless tabular crystals, the crystals several inches across, were found, with flesh-red stilbite, in the Deccan traps of the Western Ghats, near Bombay, during the construction of the Great
pink
Mexico
recent
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