SCHEELIX FERRUGINE. 

 LETIXE. ScHEELiTiNE, NicoL Beudcnt. 

 P3-i-amidal : primary form a rectangular 

 four-sided prism, with a single distinct 

 cleavage parallel to its base. Isomorphous 

 with tungstate of lime and mol^-bdate of 

 lead. Occurs in four-sided prisms (often 

 small and indistinctly aggregated), the 

 terminal edges of which are replaced by 

 octahedral planes. Colourless or yellowish- 

 grey, brownish or green. Faintly translu- 

 cent. Lustre resinous. Streak- white. Frac- 

 ture conchoidal and shining. H. 3. S.G. 

 7-8 to 8-1. 



Comp. Tungstate of lead, or PbW = 



oxide of lead 48-28, tungstic acid 51v2 = 



100. 



Anahjsis, from Zinnwald, by Chapman : 



Tungstic acid . . . 59-50 



Oxide of lead . . . 33-26 



Lime 6-37 



99-13 



BB fuses, covering the charcoal with a j 

 deposit of oxide of lead, and on cooling 

 solidifies to a dark crystalline globule. With 

 carbonate of soda, on charcoal, yields globules 

 of lead. 



Soluble in nitric acid, with separation of 

 yellow tungstic acid. 



Localities. The tin mines of Zinnwald in 

 Bohemia, associated with Quartz and Mica. 

 Bleiberg in Carinthia, with molybdate of 

 lead. Kear Coquimbo, in Chili. 



Name. After Scheele, the celebrated 

 SAvedish chemist. 



Brit. Mus., Case 38. 



ScHEELiN Ferrugine, Haiiy. See Wol- 

 fram. 



SCHEELINE Calcaire, Dufrenoy. See 



SCHEELTTE. 



ScHEELiT, Von Kohell, Haidinger, Haus- 

 mann. Scheelite, Leonhard, Beudant. 

 Pyramidal : primary form a right square 

 prism. Occurs in attached and imbedded 

 four-sided pyramids, approaching nearly to 

 the octahedron. Twins. Also reniform, 

 with a columnar structure, and amorphous- 

 granular. Colourless or grej'ish, yellowish 

 or brownish : sometimes orange - yellow. 



Fig. 372. 



Translucent. Lustre vitreous, inclining to 

 resinous on surfaces of fracture, to adaman- 



SCHEERERITE. 335 



tine on cleavage-faces. Streak white. Brittle. 

 Fracture conchoidal and uneven. H. 4 to 

 4-5. S.G. 6 to 6-07. 



Comp. Tungstate of lime, or CaW=lime 



18-92, tungstic acid 81-08 = 100. 



Analysis, from Framont, by Delesse : 

 Tungstic acid . . . 80-35 

 Lime 19-40 



99-75 



BB crackles, becomes opaque, and fuses 

 at the edges to a translucent glass. In 

 borax dissolves readily, yielding a trans- 

 parent glass, which on cooling rapidly 

 becomes milk-white and crystalline. 



Decomposed, when reduced to powder, by 

 muriatic or nitric acid, with the separation 

 of yellow tungstic acid. The lime is re- 

 moved from the powdered mineral by a 

 boiling solution of potash. 



Localities. — English. Cornwall : at Pen- 

 gelley Croft Mine, Breage ; Huel Maudlin, 

 near Lostwithiel. Huel Friendship, near 

 Tavistock, Devon, imbedded in Chlorite. 

 Xear Brandygill, Canock Fells, Cumber- 

 land, in transparent wine-yellow, or opaque 

 greyish-brown crystals, in quartz-rock, as- 

 sociate I with Wolfram. — Foreign. Schlack- 

 enwald and Zinnwald, in Bohemia. The 

 gold mines of Schellgaden, in Salzburg ; and 

 Posing in Hungary. Neudorf, in the Harz. 

 Ehrenfriedersdorf, in Saxony. Dalecarlia, in 

 Sweden. Framont, in the Yosges. Kather- 

 inenburg, in Siberia. Coquimbo, in Chili. 

 Monroe and Huntington, in Connecticut, 

 U.S. 



Name. In complivnent to the Swedish 

 chemist Scheele, who discovered Tungstic 

 acid (or, as it was. in the first instance, 

 called, " Scheelic acid,") in this mineral. 



Brit. Mus., Case 38. 



^ciiv-^iATrsE., Beudant, Nicol. See Schee- ■» 

 letine. 



Scheel-ore, Mnhs. See Wolfram. 



Scheelsaure, Naumann. Tungstic ochre. 



See WOLFKAMINE. 



Scheelsaure, "J 

 Naumann. f Tungstate of lead. See 



SCHEELSAURES C SCHEELETLNE. 



Blei, V. Leoyihard.) 



SCHEERERIT, Stronmjer. SCHEERERITE, 



Phillips, Nicol. A qiineral resin occurring 

 in loosely aggregated, feebly shining, crys- 

 talline grains and folia, or in minute aci- 

 cular crystals, in small cavities in Coal. 

 Colour white, inclining to yellow or green. 

 Opaque. Lustre pearly. Soft and very 

 friable. Tasteless. Inodorous when cold. 



