Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Stoneham, Me. < <p\ k /a \ 1 WI. Zinnwald. Cornwall, Eng. Crystallization.—Tetragonal. Axis c = Commonforms are the unit first and second order pyramids and prisms p, a,in, and d, and the ditetragonal pyramid s ^ a \?,a : t, c. Angles// = 121 41 ; dd= 133° 32; jnz= 155° i. Frequently twinned parallel to the second order pyramid, Fig. 431- Optically + with high indices of refraction and Physical Characters. H., 6 to 7. Sp. gr., to , adamantine to dull. Opaque to
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Stoneham, Me. < <p\ k /a \ 1 WI. Zinnwald. Cornwall, Eng. Crystallization.—Tetragonal. Axis c = Commonforms are the unit first and second order pyramids and prisms p, a,in, and d, and the ditetragonal pyramid s ^ a \?,a : t, c. Angles// = 121 41 ; dd= 133° 32; jnz= 155° i. Frequently twinned parallel to the second order pyramid, Fig. 431- Optically + with high indices of refraction and Physical Characters. H., 6 to 7. Sp. gr., to , adamantine to dull. Opaque to , white or pale brown. Tenacity, , brown to nearly black, sometimes red, gray, or , indistinct pyramidal and prismatic. 236 DESCRIPTIVE MINERALOGY. Before Blowpipe, Etc.—Infusible, but in powder becomes yel-low and luminous. With cobalt solution the powder or any sub-limate is made bluish green. On charcoal with soda may be re-duced, yielding metallic button and a faint white sublimate close tothe assay. Insoluble in acids and almost so in salt of phosphorusor borax in which
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