parency of horn, and the liardnefs of flint. 

 erarity is 2.71. Its conftituent parts are, 



MINERALOGY. 



The fpecific 



Silex 



Alumine - 

 Manganefe 

 Water 



75 

 22 



.50 



100 



fu^phurettcd hydrogen gas. Patron fufpefts that this 

 mineral is fafciculatcd arragonite. According to Klaproth, 

 it confifts of 



Carbonate of lime 



Carbonate of magnefia 



Lepidolite. (See Lepidolite.) When that article 

 was written, it was fuppofed that this mineral was exclu- 

 fively found on Mount Hradifco, in Moravia. Lepidolite 

 has fince been difcovered in Saxony, Sweden, Norway, 

 France, the Ifland of Elba, and in feveral parts of Scot- 

 land, particularly in lime-ftone, near Dalmally, in a flate- 

 quan^- at Ballachuliili, at the head of Loch Fyne, and at 

 Glentilt in Perthfhire. 



Leucite, Jmphigene, Haiiy. See Leucite. 



LlEOCITE, or Tenite. See Yenite. 



Lime-stone. See Lime-stone and Geology, Addenda. 



LiTHOMARGE, Friable. (See Lithomarge.) This 

 variety is charaAerifed by its fcaly particles foiling, and low 

 degree of coherence. According to Klaproth, it contains 



Silex - - - - 32- 



Alumine ... 26.50 



Iron - - - - 21. 



Muriate of foda - - - 1.50 



Water - - - - i?- 



"98 



44.62 

 37-36 



2-75 



8.00 



6. 



I. 



99-73 



Carbonate of iron 

 Carbon 

 Siliceous fand 



- 93- 



o.jo 



- 1.25 



0.50 



- 4-50 



99-75 



Lithomarge, Indurated ; yirgil lithomarge, Haiiy, (See 

 Lithomarge.) This variety occurs in veins in porphyry, 

 gneifs, grey wacke, and Terpentine, and in drufy cavities in 

 bafaltic rocks. It is intermediate between Ileatite and 

 variegated clay, and appears fometimes to pafs into meerf- 

 chaum. 



LYDiAN-5/onf. See Flinty Slate, and Horn-stone, 

 Jlddenda. 



Lytiirodes, a mineral difcovered in Norway, which 

 appears alhed to elaohte, and was called lythrodes by 

 Karften, becaufe when firft broken it appears as if fpotted 

 •with coagulated blood. Its colour is aurora-red, paffing 

 into brownifli-red or brown ; it is occafionally marked with 

 cream-yellow and greenifli fpots. It occurs maffive and 

 difieniinatcd ; it has an imperfeft foliated ftrufture. The 

 luftre of the furface is refinous and glimmering. The crofs 

 frafture is fplintery and dull : it is feebly tranflucent on 

 the edges ; it is hard. The fpecific gravity is 2.5. Accord- 

 ing to John, the conftituent parts are, 



Silex ... 



Alumine 



Lime ... 



Soda ... 



Water ... 



Oxyd of iron 



Other analyfes give a fmall portion of fulphur and man- 

 ganefe. 



Magnesian LAme-Jlone, or CoinpaS Dolomite, has gene- 

 rally a yellowifh -brown or yellowifh-grey colour, a granular 

 ftrufture, a glimmering or gliftening luftre, and diflolves 

 flowly in acids ; thefe charafters diftinguifh it from common 

 lime-ftone. The fpecific gravity is about 2.8. It contains 

 fewer petrifaflions than moft common lime-ftones. It occurs 

 in regular ftrata on the eaftern fide of England from Not- 

 tinghamfhire to Sunderland. It occurs alfo in amorphous 

 maftes, and varioufly contorted beds, and alfo forming a 

 kind of lime-ftone breccia in the red marie. According to 

 Tennant, its conftituent parts are, 

 Yurkfhire. 

 Lime - - - - - 30 



Magnefia - - - - 20 



Carbonic acid - - - "47 



Alumine . - - - j 



98 



Macle, a name given by the French mineralogifts to 

 chiaftolite or Hollow /par ; which fee. 



Madreposite, a variety of black lime-ftone, fo called on 

 account of its occurring in radiated or diverging prifmatic 

 concretions, which are fuppofed to referable the ftars of 

 madrepores : it has a minute and indiftiu&ly curvedly 

 lamellar ftrufture. When rubbed, it emits a ftrong fmellof 



Magnesite, Magnefia carhonatee, Haiiy. It occurs in 

 amorphous maftes and tuberous fpongiform. The frafture 

 is fplintery and large, and flat conchoidal. It is opaque, 

 earthy. The colour is yellowifli-grey or white, with fpots 

 and dendritic delineations of blackifti-brown. Magnefite 

 yields to the nail externally, but internally it is harder than 

 calcareous fpar ; it feels fomewhat meagre, adheres to the 

 tongue, and abforbs from nine to ten per cent, of water when 

 immerfed in it, and becomes femi-tranfparent on the edges. 

 It is flowly foluble with effervefcence in concentrated 

 muriatic acid. Before the blow-pipe it is infufible, but 

 becomes fufficiently hard to fcratch glafs. Its fpecific 

 gravity is 2.88. According to Bucholz, the conftituent 

 parts are, 



Magnefia 



Carbonic acid 



Silex 



Alumine 



Manganefe 



Lime 



Water 



100.10 



100 



It 



