^56 Professor Nccker on Mineralogy considered 



Order V.— MOLYBDENEOUS. 



Chem. Nat. — Molybdates. 



With the blowpipe easily soluble in the three fluxes ; with borax into an 

 almost colourless glass in the outer flame ; in the inner flame, into a transpa- 

 rent glass when warm, and becoming dark, opake and brownish by cooling ; 

 with the salt of phosphorus a small quantity of the mineral gives a green 

 glass, a greater proportion a black and opake glass. Insoluble in acids when 

 cold, difficultly soluble in warm muriatic acid. Scratch gypsum. 



Geru Molybdate of lead, or yellow lead spar. 



Order VI.— SCHEELIDEOUS. 



Chem. Nat. — Tungstates. 



With the blowpipe easily soluble in the three fluxes ; with the salt of 

 phosphorus (when the particle of mineral is very small relatively to the flux) 

 into a colourless glass at the outer flame, and into a fine blue glass at the inner 

 flame. Completely soluble without effervescing, or leaving a yellow powder 

 in warm muriatic acid. Scratch fluor spar. 



Gen Tungstate of lime or scheelite ; tungstate of lead. 



Order VII CHROMIDEOUS. 



Chem. Nat — Chromates. 



With the blowpipe soluble in borax and the salt of phosphorus, into a 

 glass which is green at the outer flame ; with soda on the charcoal the mass 

 is absorbed, on the platina leaf melts either entirely or partially, into a glass 

 which is green at the reductive, and yellow after cooling at the oxidating 

 flame. Entirely or partly soluble, without effervescence, in muriatic acid. 

 , Scratch gypsum. 



Gen. — Chromate of lead, or red lead spar ; Vauquelinite. 



Order VIIL— FLUORIDEOUS. 



Chem. Nat. — Fluates. 



With the blowpipe melt with borax and salt of phosphorus ; these mine- 

 rals, mixed with melted salt of phosphorus, and the mixture warmed at the 

 extremity of an open tube, in which is introduced the flame ; a liquid is disen- 

 gaged, which corrodes the tube, and turns Brazil wood paper yellow ; the 

 harder scratch fluor spar, the softer only gypsum. 



Gen, — Fluor spar ; cryolite ; fluate of yttria ; fluate of cerium. 



Order IX.— PHOSPHATIDEOUS. 



Chem. Nat — Phosphates. 



With the blowpipe fusible either alone or with borax and salt of phospho- 

 rus ; melted with boric acid, a fragment of iron wire introduced in the glo- 

 bule, and heated at a strong fire, is melted in vitreous globules of phosphu- 

 ret of iron. Soluble in acids. Scratching fluor spar, or gypsum. 



