A glossary of mineralogy . Protoxide of iron. .31-25Alumina .... 8-55Alkalies and loss . . 20-00Water 5-47 100-00BB alone, instantly blackens and melts atthe extremity to a shining black globule:with borax effervesces and forms a clearbottle-green glass. Localities. Near Asheville, Buncombecounty. North Carolina, in imperfectly stel-late groups, and also spreading out intolaminae between layers of Corundum; also CORUNDUM,frequently with, the Corundum of AsiaMinor. Name. From Corund (^Corundum), and^/X«?, a friend. Brit. Mus , Case 32. Corundum, PJdUips. : commonly occur
A glossary of mineralogy . Protoxide of iron. .31-25Alumina .... 8-55Alkalies and loss . . 20-00Water 5-47 100-00BB alone, instantly blackens and melts atthe extremity to a shining black globule:with borax effervesces and forms a clearbottle-green glass. Localities. Near Asheville, Buncombecounty. North Carolina, in imperfectly stel-late groups, and also spreading out intolaminae between layers of Corundum; also CORUNDUM,frequently with, the Corundum of AsiaMinor. Name. From Corund (^Corundum), and^/X«?, a friend. Brit. Mus , Case 32. Corundum, PJdUips. : commonly occurs crystallizedin six-sided prisms, which rarely exhibit, atendency to flat triedral terminations; alsoin obtuse and acute hexahedral is likewise found granular or nearly colourless and slighthtranslucent, but more frequently with agreyish, greenish or reddish tint, or brownwith a chatoyant lustre. Fracture con-choidal, uneven. Extremely tough whencompact. H. 9. 3-9 to 4-1. Fig, Fig. 133. Comp. M or oxide of aluminium, whenpure. —Aluminium 53-19, ox3-gen 46-81=- Analysis of Corundum of India, by Smith : Alumina .... 9^*12Magnesia . . .0 91 -Linie 1-02 Silica 0-96 Water 2-86 98-87 JBB like sapphire. Localities. In hexagonal crystals atCarrock Fells in Cumberland, and in smallrolled fragments in the bed of a stream inthe county of Wicklow. Foreign.—Ingranite rocks in China, Ava, on the coast ofMalabar and in the Carnatic: also lessabundantly at Gellivara, in Sweden, inMagnetic Iron; near Mozzo in Piedmont,and at St. Gotthard Largelyin Asia Minor. Name. From the Intlian, ^orawd This is the hardest of all known bodies,except the Diamond. The name Cortmdumis commonly confined to the opaque roughcrystals and cleaveable masses, generally ofdingy colours and often dark; while theterm Emery embraces the more or less im- COUZERANITE. 97 pure, massive, granular and compact kinds,and Sapphire and Ruby comprise thetransparent, brightly
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectmineral, bookyear1861
