Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Magnet Cove, Ark. Crystallization.—Tetragonal. Axis c = Very closeto cassiterite in angle and form. Usual combinations are unit firstand second order pyramids p and d and first and second orderprisms in and a. Often twinned in knees, Fig. 434, and rosettes,Fig. 433. Prisms often striated vertically. Angles//= 123 -jY^ ; dd= 134° 58. Optically -)- with very high indices of refraction and yellow light. Physical Characters. H., 6 to , Sp. gr., to , adamantine to

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Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Magnet Cove, Ark. Crystallization.—Tetragonal. Axis c = Very closeto cassiterite in angle and form. Usual combinations are unit firstand second order pyramids p and d and first and second orderprisms in and a. Often twinned in knees, Fig. 434, and rosettes,Fig. 433. Prisms often striated vertically. Angles//= 123 -jY^ ; dd= 134° 58. Optically -)- with very high indices of refraction and yellow light. Physical Characters. H., 6 to , Sp. gr., to , adamantine to nearly metallic. Opaque to , white, pale brown. Tenacity, brittle. Color, reddish brown, red, black. Deep red when , prismatic and pyramidal. Before Blowpipe, Etc.—Infusible. In salt of phosphorusdissolves very slowly in the oxidizing flame to a yellow beadwhich becomes violet in the reducing flame. Insoluble in acids. Similar Species.—It is redder and of lower specific gravity thancassiterite. The nearly metallic lustre, weight and infusibili

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