72 CHALCEDONYX. 



Fine specimens are procured north of 

 Monte Verdi, in Tuscany, and from the 

 amygdaloids of Iceland, and the Faroe 

 Isles ; it is also found in Cornwall, Devon, 

 Cumberland, in England ; at the Pentland 

 Hills, in Fifeshire and other places in Scot- 

 land ; and at Antrim, near the Giant's Cause- 

 way, and in other parts of Ireland. 



Cubical crystals and ver}' line botryoidal 

 and stalactitic specimens are found in flints 

 at Houghton Chalk-pit, near Arundel in 

 Sussex ; and beautiful specimens of sponges 

 of the Cretaceous period, converted into Chal- 

 cedony, may be picked up on the shore at 

 Worthing, Littlehampton, Bognor, Selsev, 

 &c. 



Name. Chalcedony is named after Chal- 

 cedon in Asia Minor, where it is said to 

 have been originally obtained. 



Brit. Mus., Case '12 and 23. 



31. P. G. Horse-shoe Case, Kos. 661, 

 C62, 654, 666 to 671, 674. 



Chalcedonyx. a variety of Chalce- 

 dony, with alternating stripes of white and 

 grey. 



Chalcodite. The name proposed in 

 1851, by Professor C. U. Shepard, for a 

 mineral which had previously'' been referred 

 to Cacoxene. It occurs in minute flexible 

 scales, grouped into drusy concretionary 

 crusts, coating Hematite. Colour greenish, 

 bronze, and bi'ass-vellow. H. 1 to I'O. S.G. 

 2-76. 



Comp. 2R Si+it Si + 2H (approaching 

 Stilpnomelane, Brush). 

 Analysis (mean) of green variety, bv-BrMsA; 

 Silica . . . . . 4o-29 

 Alumina .... 362 

 Peroxide of iron . . . 20'47 

 Protoxide of iron . . . 16-47 

 Protoxide of manganese . trace 



Lime 0-28 



Magnesia .... 4-56 

 Soda and potash . . . traces 

 Water 9-22 



99-91 



Dissolves readil}^ in hot muriatic acid. 



Locality. The Stirling iron mine, Ant- 

 werp, Jetterson co., U.S. 



Name. From x'^-^^-'^^'^^, like brass; from 

 its bronze-like lustre. 



Brit. Mu3., Case 26. 



Chalcolite, Beudant. Chalcolith, 

 JVerncr, Haidinger, Hausmann, v. Kobell. 

 A variet}' of Uranite in which copper takes 

 the place of lime. Pyramidal ; the crystals 

 generally assuming a tabular form. Colour 

 emerald-, and grass-green, sometimes leek-, 



CHALCOPHYLLITE. 



and apple-, and verdigris-green, with a streak 

 somewhat paler than the colour. H. 2 to 

 2-5. S.G d'b to 3'6. 



Comp. (Cu, 2#) P + 8H = phosphoric 

 acid lo-l, oxide of uranium 61-2, oxide of 

 copper 8-4, water 15-3 = 100. 



Analysis by Phillips : 



Oxide of uranium . . . 60-0 

 Phosphoric acid . . . 16 -(J 

 Oxide of copper . . .9-0 

 Water 150 



• 100 



BB fuses to a black mass, colouring the 

 flame bluish -green. 



In nitric acid gives a yellowish-green so- 

 lution ; in ammonia a blue solution. 



Localities. — English. Magnificent speci- 

 mens have been found at Gunnis Lake, near 

 Callington in Cornwall : other Cornish lo- 

 calities are HuelBuller, and South Kuel Bas- 

 set, Redruth : Tin-croft mine, Illogan ; Huel 

 James, Withiel; Stenna Gwynn, near St. 

 Austell ; Devonshire, at Bedford United 

 mines near Tavistock, — Foreign. Johann- 

 georgenstadt, Eibenstock and Schneeberg 

 in Saxony; Joachimstahl and Zinnwald 

 in Bohemia ; Vielsalm in Belgium, &c. 



Name. From x;«.^«c?, copper, and xiSo;, 

 stone. 



Brit. Mus., Case 57. 



This species may be distinguished from 

 Green Mica by the brittleness of its laminse, 

 which do not bend, and are not flexible and 

 elastic like those of Mica. Mica, also, is 

 not soluble in nitric acid. 



M. P. G. Wall-case 13 on Principal 

 Floor (British). 



Chalcophacite, Glocker. See Liro- 



CONITE. 



Chalcophyllite. Hexagonal. Occurs 

 in six-sided tabular crystals, of which the 

 lateral planes are trapeziums, inclining 

 alternately in contrary directions ; also in 

 foliated masb.es and druses. Colour emerald-, 

 grass-, or verdigris-green, with a vitreous 

 lustre except on the cleavage planes, where 

 it is pearly. Transparent, or translucent. 

 Streak rather paler than the colour. Sec- 

 tile. H.2. S.G. 2-4 to 2-66. 



Comp. As, 6Cu + 12 H=: arsenic acid 24-9, 

 oxide of copper 51'7, water 23'4 {Damour). 

 Analysis from Cornwall, by Damour; 

 Arsenic acid . . .21*27 



Oxide of copper . , . 52-30 

 Alumina .... 2-13 

 Phosphoric acid , . ,1-56 



