Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . el. In closedtube yields water. Soluble in hydrochloric acid, with residue of fine powder. STILBITE.—Desmine. Composition. — H^ (Na^. Ca) Fig. 650. Al,(Si03), + 4H,0. General Description.—Tab-ular crystals, of white, brownor red color, pearly in lustre onbroad faces and frequently unitedby these faces in sheaf-like globular or radiated. Cape Blomidon, N. S. Crystals are orthorhombic in appearance, but really complexmonoclinic twins. Physical Characters. H., to 4. Sp. gr., to
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . el. In closedtube yields water. Soluble in hydrochloric acid, with residue of fine powder. STILBITE.—Desmine. Composition. — H^ (Na^. Ca) Fig. 650. Al,(Si03), + 4H,0. General Description.—Tab-ular crystals, of white, brownor red color, pearly in lustre onbroad faces and frequently unitedby these faces in sheaf-like globular or radiated. Cape Blomidon, N. S. Crystals are orthorhombic in appearance, but really complexmonoclinic twins. Physical Characters. H., to 4. Sp. gr., to , vitreous or pearly. Translucent. Streak, white. Tenacity, brittle. Color, yellow, brown, white, , parallel to pearly face. Before Blowpipe, Etc.—Swells and exfoliates in fan shapes,and fuses easily to a white, opaque glass. Yields water in closedtube. Soluble in hydrochloric acid, with a pulverulent residue. Remarks.—Occurs with other zeolites. CHABAZITE. Composition.—(Ca, Na,)Al2(Si03), + 6Hp. General Description.—Simple rhombohedral crystals, almost. 386 DESCRIPTIVE MINERALOGY. cubic, also in modified forms and twins. Faces striated parallelto edges. Color, white, pale-red and yellow. Physical Characters. H., 4 to 5. Sp. gr., to , vitreous. Translucent, transparent. Streak, white. ? Tenacity, brittle. Color, white, red, , parallel to the unit rhombohedron. Crystallization.—Hexagonal. Scalenohedral class, p. c = \ .086. Unit rhombohedron p and negative rhombo-hedra e ^= a : 00 a : a : y^c and f = a : <y^ a : a : 2c are most com-mon. Angles pp = 94° 46 ; ee = 125 13. Optically — usually, sometimes +; interference figure confused. Fig. 651. Fig. 652. Fig. 653.
Size: 2172px × 1150px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkdvannostran
