Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . ink silky fibres or powder, and rarely smallmonoclinic crystals. Physical Characters.—Translucent to opaque. Lustre, silky, dull. Color,white or tinged red by erythrite. Streak, white. H., 2 to , Sp. gr., to Before Blowpipe, Etc.—Fuses to a white or bluish enamel and colors the flamelight blue. On charcoal, yields garlic odor. In closed tube, yields water. Easilysoluble in acids. Remarks.—Occurs with arsenical ores, especially smaltite, arsenopyrite andproustite. ARAGONITE.—Flos Ferri.
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . ink silky fibres or powder, and rarely smallmonoclinic crystals. Physical Characters.—Translucent to opaque. Lustre, silky, dull. Color,white or tinged red by erythrite. Streak, white. H., 2 to , Sp. gr., to Before Blowpipe, Etc.—Fuses to a white or bluish enamel and colors the flamelight blue. On charcoal, yields garlic odor. In closed tube, yields water. Easilysoluble in acids. Remarks.—Occurs with arsenical ores, especially smaltite, arsenopyrite andproustite. ARAGONITE.—Flos Ferri. Composition.—CaCOj, (CaO , CO2 per cent.). General Description.—This form of calcium carbonate isfound in orthorhombic crystals, which are frequently pseudo-hexagonal from twinning, and as groups of acutely terminatedneedle crystals, which grade into fine fibres. It also occurs stal-actitic, incrusting and in pure white groups of interlacing, coral-like stems. The prevailing tint is white, but is occasionally violetor pale green. Fig. 522. Fig. 523. Fig. 524. Fig. Bilin, Boh. Herrengrund. Crystallization.—Orthorhombic. Axes = : i Occasionally simple crystals. Fig. 522, with acute domes
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