DUFR^NOYSITE. 



BB fuses easily to a black opaque c:lass. 

 Localities. Department of la Haute Vienne, 

 in France ; at Anglar, near Limoires. Siegen, 

 in Prussia. (See Grekn Iron Ore.) 



Name. Named after Dufrenoy, Professor 

 of Mineralogy. 



• DuFiENOYSiTE,Z)amoMr. Cubical. Colour 

 steel-grey. Lustre metallic. Streak reddish- 

 brown. Brittle. Fracture uneven. S.G. 5*074 

 to 5 55. 



Comp. 2PbS + AsS3 = lead 57-2, sulphur 

 22-1, arsenic 20 -7 = 100. 

 Analysis, bv Damour : 



Lead .' . . . . 56-61 

 Sulphur .... 22-30 

 Arsenic . . . . 20 87 



Iron 0-32 



Copper . . . .0-22 

 Silver 0-17 



100-49 

 BB fuses easily, yielding sulphurous and 

 arsenical fumes and a globule of lead. 

 Dissolves in acids. 



Localities St. Gotthard in small veins in 

 Dolomite, with Realgar, Orpiment, Blende 

 and Pyrites. Valley of Binnen in the can- 

 \ ton of Valais, in Dolomite, with Realgar. 



j Name, After Dufrenoy, late Professor of 



'. Mineralogy at the Museum of Natural His- 



tory, Paris. 



Brit. M us., Case H. 

 j DuNGivEN Crystals. Yellow or smoky 



'• Rock Crystal, found in large, and sometimes 



very perfect, detached crystals, imbedded in 

 the soil at Finglen Mountain, close to Dun- 

 given, in the parish of Banaglier, in Ire- 

 land. 



DusoDiLE. See Dysodile. 

 Dyoxylite, Shepard. See Lanarkite. 

 Dysclasite, Connel. This mineral was 

 formerly supposed to be a yariety of Meso- 

 type, but was subsequently described as a 

 j distinct species by Connel. It is now re- 



' garded as a kind of Okeuite. S.G. 2-362. 



: Analysis by Connel : 



i Sifica 57-69 



Lime 26-83 



Protoxide of manganese . 0-22 



Potash 0-23 



Soda 0-44 



Peroxide of iron . . .0-32 



100-44 



Locality. The Faroe Isles. 



Name. From ^-j;, difficultly, and xXkIh,}^ to 

 break, in allusion to the time and labour 

 required to break a mass into smaller frag- 

 ments, in consequence of its extreme tougn- 

 ness. 



DYSYNTRIBITE. 119 



Dyskolite. See Saussurite. 

 Di'SLUiTE. A Zinc-Manganese-and-Iron- 

 Spinel of a yellowish-brown or greyish- 

 brown colour, occurring at Sterling, in New 

 Jersey, U. S., with Franklinite and Wille- 

 mite. S.G. 4-55. 



Comp. (Zn Mn) (Al F^e). 



Dyslytite, Shepard. Occurs as a black- 

 ish-brown powder in many meteorites, of 

 which it generally constitutes from 0-25 to 

 225 per cent. It is supposed to be a phos- 

 phide of iron, nickel, and magnesium. 



Name. From ^vo-xCto;^ insoluble. 



DYSODILE, Cordier, Phillips. A combus- 

 tible mineral, found in secondary limestone, 

 at Melili, near Syracuse, in Sicily, of a yel- 

 lowish or greenish- grey colour, either com- 

 pact or in foliated masses, composed of thin 

 paper- like thin and flexible leaves, contain- 

 ing impre.ssions of fish and dicotyledonous 

 plants. It is extremely fragile, and emits 

 an argillaceous odour when breathed on. It 

 burns with a crackling noise, and consider- 

 able flame and smoke, and gives out a very 

 fetid smell ; whence it has acquired the 

 name of Stercus Diaholi or Merda del Diavolo 

 in Sicily. Macerated in water, it becomes 

 translucent, and its laminas acquire flexi- 

 bility. S.G. 1-146. 



It is also found in France, at Chateau 

 Neuf, near Viviers, Dept. du Rhone ; Saint- 

 Amand, in Auvergne, and in the neigh- 

 bourhood of Narbonne. 



Dystomic Augite Spar, Haidinger. 



See BUCKLANDITE. 



Dystomic HabkoneiM Malachit, Mohs. 

 See Erinite. 



Dyssnite, v. Kohell. A kind of Fowlerite, 

 resembling Marceline, but less hard. It is 

 an aluminate of iron and manganese, oc- 

 curring in granular metallic masses, at 

 Franklin, New Jersey, U. S. 



Dysyntribite, Shepard. A massive, 

 granular, or slaty and tough variety of 

 Agalmatolite, somewhat resembling Ser- 

 pentine in appearance, but of very variable 

 composition. Colour dark green, greyish, 

 or yellowish, sometimes mottled with red 

 and black. Almost dull. Tough. Fracture 

 even, splintery. H. 3 to 3-5. S.G. 2 76 

 to 2-81. 



Analysis, by Smith §' Brush : 



Silica 44-80 



Alumina . . » . 34-90 

 Peroxide of iron . . . 3-01 



Lime 0-66 



Magnesia . . . .0-42 

 Potash ..... 6-87 



Soda 3-60 



l4 



