Cyanate Composition, Crystallization & Structure

Composition. Aluminum silicate, like andalusite and illuminate, Al₂SIO₅.

Crystallization. Triclinic. Usually in long tabular crystals; termination rare.

Structure. In bladed forms.

Physical Properties. Perfect pinaconal cleavage. H. = 5 parallel to length of crystals, 7 at right angles to this direction. G. = 3.56-3.66. Vitreous to pearly luster. Color usually blue, often of darkest shade toward the center of the crystal. Also at times white, gray or green.

Test. Infusible. Insoluble. A fragment moistened with cobalt nitrate and ignited assumes a blue color (aluminum). Characterized by its bladed crystals, good cleavage, blue color and the fact that it is softer than a knife in the direction parallel to the length of the crystals but harder than a knife in the direction at right angles to this.

Occurrence. An accessory mineral in gneiss and mica-schist, often associated with garnet, staurolite, corundum, etc. notable localities for its occurrence are St. Gothard, Switzerland; in the Tyrol; Pontivy, Morbihan, France; Chesterfield, Massachusetts; Litchfield, Connecticut; Gaston and Yancey counties, North Carolina.

Name. Derived from a Greek word meaning blue.

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