Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . 4, c, Figs. 511 and 514. Angles ;«;« =III 10; pp^ I4348;^r= 168° CALCIUM AND MAGNESIUM MINERALS. 307 Optically +. Axial plane at ordinary temperature b, but withhigher temperatures the axial angle diminishes and the axes passinto a plane at right angles to b, the axes for red light so passingat about 120 C, those for yellow Fg- Si5- light at about 135° C, and theothers each at a definite temperature. Physical Characters. H., to 2. Sp. gr., to Lustre, pearly, silky, vitreous. Strea
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . 4, c, Figs. 511 and 514. Angles ;«;« =III 10; pp^ I4348;^r= 168° CALCIUM AND MAGNESIUM MINERALS. 307 Optically +. Axial plane at ordinary temperature b, but withhigher temperatures the axial angle diminishes and the axes passinto a plane at right angles to b, the axes for red light so passingat about 120 C, those for yellow Fg- Si5- light at about 135° C, and theothers each at a definite temperature. Physical Characters. H., to 2. Sp. gr., to Lustre, pearly, silky, vitreous. Streak, white. Color, white, colorless, gray,red, yellow, brown. Transparent to opaque. Tenacity, brittle, laminae flexible. Cleavage easy parallel to clino Ellsworth, Ohio, pinacoid and positive unit ortho dome. The cleavage fragments are rhombic plates with angles66° and 114^. Other less prominent cleavages also exist. Before Blowpipe, Etc.—When heated quickly becomes whiteand opaque and fuses to an alkaline globule, coloring the flameyellowish-red. In closed tube yields water. Soluble in hydro-chloric acid. The powdered dehydrated mineral when mixed withwa
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