212 LEDERERITE. 



excrements of bats. These infest the cave 

 in great numbers, and have most likely in- 

 habited it for ages. The cave at the time 

 of the doctor's visit was being worked for 

 siitre, which was obtained " directl}^ by 

 lixiviating the earth taken from near the 

 entrance." " The matrix containing the 

 crystals merely furnished a black, tar-like, 

 semi-fluid mass, without nitre." 



Ledererite, C. T. Jackson, Dufrenoy. 

 A variety probably of Gmelinite, containing 

 a certain quantity of phosphate of lime, as 

 a mixture. Occurs in extremely bril- 

 liant, low, six-sided prisms, terminated at 

 ■each extremity by six-sided pyramids, which 

 are replaced at their summits by little 

 liexahedral tables. Generally implanted in 

 Analcime or Stilbite. Colour sometimes pale 

 or salmon -red, and translucent only, but 

 generally transparent and colourless. H. 

 scratches Felspar with difficulty. S. G. 2"169. 



Comp. According to Dana, the same as 

 Chabazite, with one-third the amcuut of 



water, or (Ca Na) Si + 3A1 Si^ + 2H= silica 

 55-75, alumina 23-10, soda 4-67, lime 8-39, 

 water 8-09=^100. 

 Analysis, bv Hayes : 



Silica / . . . . 49-47 

 Alumina . . . .21-48 



Lime 11-48 



Soda 3-94 



Phosphoric acid . . . 3'48 

 Oxide of iron . . .0-14 

 Foreign matter . . .0-03 



Water 8-58 



Loss ..... 1-40 



100-00 



SB becomes opaque, and yields a white 

 enamel, which, by long exposure to the 

 flame, becomes more glassy. With carbo- 

 nate of soda effervesces, and yields a white 

 enamel. 



Entirely soluble in muriatic acid. 



Locality. Cape Blomidon, Nova Scotia, 

 in a basaltic rock, with Mesotype, Stilbite, 

 and Analcime. 



Name. After Baron Lewis von Lederer, 

 formerly Austrian ambassader to the United 

 States. 



Brit. Mus., Case 37. 



Lederite, Shepard. A variety of Sphene, 

 occurring in masses and in amber-coloured 

 crystals in a vein of Graphite. Colour also 

 light clove- or chocolate-brown. Translu- 

 cent. H. 5-5. S.G. 3-49 to 3-51. 



Analysis, by T. S. Hunt : 



Silica 31-83 



Titanic acid .... 40-00 



LEHUNTITE. 

 Lime . . . . 

 Loss by ignition . 



28-31 

 0-40 



100-54 



Localities. Canada ; at Grenville, Mont- 

 real, &c. 



Lbedsite, Thomson. A mechanical mix- 

 ture of Gypsum and Barytes. Colour white. 

 Lustre silky. Translucent at the edges. 

 Brittle, and easily frangible. Texture foli- 

 ated. H. 4. S.G. 3-87. 



Comp. Sulphate of lime 71'9, sulphate of 

 baryta 28-1 = 100. 



Locality. Between Leeds and Harrow- 

 gate, in Yorkshire, in a carboniferous rock. 



Leei.ite, Dr. Clarke. The Hellejiinta of 

 the Swedes. It occurs compact and massive, 

 with a peculiar wax-like texture, and a 

 lustre and translucency like that of horn. 

 Colour deep flesh-red. Fracture like that of 

 flint. S.G. 2-71. 



Analysis, by Dr. Clarke : 



Silica "..... 75-0 

 Alumina .... 22-0 

 Manganese , . . .2-5 

 Water 0-5 



100-0 

 Locality. Gryphyttan, in Westmania, 



Sweden. 

 Name. After Dr. J. F. Lee, F.R.S. G.S. 



of St. John's College, Cambridge. 



Lehmannitb, Brooke §• Miller. See Cro- 



COISITE. 



Lehrbachite, Brooke §- 3IiUer. Appa- 

 rently a mixture of Clausthalite and Sele- 

 nide of Mercury, having the structure and 

 colour of Clausthalite. S.G. 7*3. 

 Analysis, by Rose : 



Selenium . . . .27-98 



Lead 27-33 



Mercury .... 44-69 



100-00 



BB gives off the odour of Selenium ; and 

 with soda affords Mercury. 



Localities. Lehrbach, and Tilkerode, in 

 the Harz. 



Lehuntite, Thomson. A compact variety 

 of Natrolite with air-cavities, lined with 

 minute crystals of Stilbite. which appear 

 like minute scales. Colour flesh-red. Trans- 

 parent at the edges. Lustre pearly. Frac- 

 ture granular. H. 3*75. S.G. 1-953. 



Comp. Na Si + Al Si + 3H. 



Analysis, by Thomson : 



Silica 47-33 



Alumina .... 24-00 



