CANTONITE. 



green. Lustre resinous inclining to vitreous. 

 Slightly translucent (most Pitchstones be- 

 ing opaque). Fracture tending to conchoi- 

 dal. S.G. 2-36. 



Comp. 3A1 Si + K Si^ + 3H. 





Analysis by Berthier : 





Silica .... 



64-45 



Alumina . . . . 



15-64 



Lime .... 



1-20 



Oxide of iron 



4-30 



Magnesia 



. 1-20 



Potash 



. 5-40 



Water .... 



. 7-10 



99-24 

 BB fuses to a white enamel. 



Locality. Cantal. 



Cantonite, N. a, Pratt, Jun. Is met 

 •with crystallized in well-formed cubes dif- 

 fused through large masses of rock made up 

 of small cubic Pyrites, and in an impalpable 

 state disseminated through a veinstone of 

 granular Quartz and Staurotide. Colour 

 and streak bluish-black. Lustre sub-metal- 

 lic and shining. H. 1-5 to 2. S.G. 4-18. 



In physical properties (except in streak) 

 and in composition, Cantonite is identical 

 with Covelline ; being, however, cubical 

 instead of hexagonal, and exactly simi- 

 lar to Harrisite and Galena. 



It is named after the locality where it oc- 

 curs, the Canton mine, Georgia, U.S. 



Capillary Obsidian. See Pele's 

 Hair. 



CAPiLiiARY Pyrites, Jameson, Kirwan. 



See MiLLERITE. , 



Capillary Red Oxide of Copper, 

 Phillips. See Chalootrichite. 



Caporcianite. Oblique. A flesh-red 

 coloured mineral, with a pearly lustre, pro- 

 bably related to Laumonite. 



Camp. Ca, Al, 4Si, 3H = Iime 12-15, 

 alumina 22-31, silica 5382, water 11-72 ==100. 

 Analysis by Anderson : 



Silica . . . . . 52-8 

 Alumina . . . .21-7 



Lime 11-3 



Magnesia . . . .0-4 



Soda 0-2 



Potash 1-1 



Peroxide of iron . . .0-1 

 Water 13-1 



100-7 

 BB swells up slightly and fuses immediate- 

 ly to a white enamel. 



Dissolves easily in acids. 



Localities. In geodes in the Gabbro rosso 



CARBONATE OF ZINC. 63 



of Monte de Caporciano, at L'Impruneta and 

 other places in Tuscany ; with Calcite, and 

 sometimes with Native Copper. 



Brit. Mus., Case 28. 



Capped Quartz. A variety of Quartz 

 Crystal, found in Cornwall, imbedded in 

 compact Quartz. When the investing ma- 

 trix is broken the crystals are revealed, and 

 at the same time a cast or impression in 

 intaglio of their pyramidal terminations is 

 obtained, forming the capping from which 

 this variety of Quartz derives its name. 



In this instance the crj-stals were formed 

 first and then a deposit of compact Quartz 

 has been deposited over them subsequently, 

 a slight film intervening between the cry- 

 stals and the Quartz which invests them. 



M.P.G. Horse-shoe Case, No. 478. From 

 Tintagel Slate Quarries. 



Carboceriije, Beudant. See Lanthan- 



ITE. 



Carbonate of Barytes, Phillips. See 



WiTHERITE. 



Carbonate of Bismuth. See Bismu- 



TITE. 



Carbonate of Cerium, Phillips. See 

 Lanthanite. 



Carbonate of Copper. See Mala- 

 chite : also Mysorin, Lime-Malachite, 



AZURITE. 



Carbonate of Iron. Phillips. See 

 Chalybite: also Clay-ironstone, Jun- 



KEKITE, SpH.EROSIDERITE. 



Carbonate of Lead, Phillips. See 

 Cerusite. 



Carbonate of Lime, Phillips. See Cal- 

 cite: also Schiefer-spar, Stalactite, 

 Stalagmite, Oriental Alabaster, Ag- 

 aric-mineral, Aphrite, Stinkstone, 

 Travertine, Tufa, Aragonite, &c. 



Carbonate of Magnesia, Phillips. See 

 Magnesite. 



Carbonate of Magnesia and Iron, 

 See Breunnerite. 



Carbonate of Manganese, Phillips. 

 See DiALLOGiTE : also Manganocalcite. 



Carbonate of Natron, La Metherie. 

 See Trona. 



Carbonate of Silver, Phillips. See 

 Selbite. 



Carbonate of Soda, Phillip's. See 

 Trona. 



Carbonate de Soude, Brochant. See 

 Natron. 



Carbonate of Strontian. See Stron- 

 tianite. 



Carbonate of Uranium. See Yog- 

 lite and Zippeite. 



Carbonate of Zinc, Phillips. See Ca- 

 lamine. 



