analcime (analcite) Mineral
O; sp. gr. 2.2–2.3; hardness
; can be colourless or white, with grey, red, and greenish tints, sometimes pigmented with iron oxides; vitreous lustre
polyhedra and tetragonal trioctahedra, also found in granular aggregates; cleavage
poor, cubic; occurs in rocks of low-temperature igneous
origin that are rich in soda and water (e.g. nepheline
syenites), and also volcanic tuffs
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