Pectolite Composition, Crystallization & Structure

Composition. HNaCa₂(SiO₃)₃ = Silica 54.1, lime 33.8, soda 9.3, water 2.7.

Crystallization. Monoclinic. Crystals usually elongated parallel to the ortho-axis.

Structure. Usually in aggregates of acicular crystals. Fre quently radiating, with fibrous appearance. Sometimes compact Physical Properties. Perfect cleavage parallel to the orthopinacoid. H. = 5. G. = 2.7-2.8. Vitreous to pearly luster. Colorless, white or gray

Tests. Fuses quietly at 2.5-3 to a glass; colors flame yellow (sodium). Decomposed by hydrochloric acid, with the separation of silica but without the formation of a jelly. Filtered solution with ammonium hydroxide and ammonium carbonate gives . white precipitate of calcium carbonate. Water in C. T.

Occurrence. A mineral of secondary origin similar in its occurrence to the zeolites. Found lining amygdaloidal cavities in basalt, associated with various zeolites, phrenite, calcite, etc. Found at Bergen Hill and West Paterson, New Jersey.

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