A glossary of mineralogy . WITHERITE. 407 angles to the former direction and acrossthe prism. Lustre vitreous. Streak 6 to 6-5. 3-i to 3-3. BB intumesces, and fuses with difficultyto a dark greenish-grey scoria. Not acted on by acids. Locality. — Scotch. Glencoe, in Argyle-shire, both crystallized and massive, liningsmall cavities in trap-rock (Jig. 458). Name. Named by Sir David Brewsterafter the discoverer, Henry Witham. Brit, Mus., Case 35. WiTHERiT, Werner. Witherite, Dana, Fig. 459 Fig. Fig. 4G0. Fig. 462. Phillips, Greg §• Lettsom, Nicol. Rhombic:primary form a right
A glossary of mineralogy . WITHERITE. 407 angles to the former direction and acrossthe prism. Lustre vitreous. Streak 6 to 6-5. 3-i to 3-3. BB intumesces, and fuses with difficultyto a dark greenish-grey scoria. Not acted on by acids. Locality. — Scotch. Glencoe, in Argyle-shire, both crystallized and massive, liningsmall cavities in trap-rock (Jig. 458). Name. Named by Sir David Brewsterafter the discoverer, Henry Witham. Brit, Mus., Case 35. WiTHERiT, Werner. Witherite, Dana, Fig. 459 Fig. Fig. 4G0. Fig. 462. Phillips, Greg §• Lettsom, Nicol. Rhombic:primary form a right rhombic prism. Oc-curs in crystals, which are nearly, if notalways, compound, and resembling the com-mon form of Quartz, viz. six-sided prisms,terminated by six-sided pyramids; also inglobular, tuberose, botryoidal, stalactiticforms. Also amorphous. Colour generallywhite; sometimes greyish or , sometimes transparent. Lustrevitreous; of fracture resinous. Streak Fracture uneven. Tasteless andpoisonous. H. 3 to 3-5. 4*29 to 4-35. Carbonate of bai-yta, or Ba C=-baryta77-7, carbonic acid 22-3 = 100. BB fuses readily, forming a clear bead,which becomes white and opaque on cool-ing; on charcoal boils violently, becomescaustic, and is absorbed. Soluble in 4304 parts of cold, and 2304parts of boiling, water. Dissolves slowly and with slight effer-vescence in dilute muriatic or nitric acid. Localities. — English. Alston Moor, Cum-berland (fig. 461). Wolhope, Durham. A
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectmineral, bookyear1861
