236 



CRYSTALLIZATION. 



but the finest crystals are met with at Montmartre, near 

 Paris. 



The primary form is that of an oblique rectangular prism, 

 with ten rhomboidal faces, two of which are larger than 

 the rest. 



It is split into thin laminae, and mounted on glass slides 

 for the polariscope, and upon the thickness of the film de- 

 pends the colour. 



The following list of crystals may direct the student to 

 many interesting specimens : "* 



Nitrate of Ammonia. 



Acetate of Copper. 



Acetate of Manganese. 



Acetate of Soda. 



Acetate of Zinc. 



Acetate of Lead. 



Agate, transparent sections. 



Alum. 



Arseniate of Potass. 



Bicarbonate of Potassium. 



Bichromate of Potassium. 



Borax, or B irate of Soda. 



Boracic Acid. 



Bismuth. 



Carbonate of Potass. 



Carbonate of Lime. 



Carbonate of Soda. 



Chlorate of Potass. 



Chloride of Barium. 



Chloride of Cobalt. 



Chloride of Sodium. 



Deut-iodide of Mercury. 



Citric Acid. 



Granite, transparent sec- 

 tions. 



Hydrochlorate or Muriate of 

 Ammonia. 



Iodide of Potassium. 



Iodide of Quinine. 



* These are mounted for the Polariscope by Mr. Topping. 



Nitrate of Baryta. 

 Nitrate of Bismuth. 

 Nitrate of Copper. 

 Nitrate of Soda. 

 Nitrate of Uranium. 

 Oxalic Acid. 

 Oxalate of Lime, 

 Oxalate of Ammonia. 

 Oxalate of Potass. 

 Oxalate of Soda, 

 Phosphate of Ammonia. 

 Phosphate of Soda. 

 Salicine. 



Sulphate of Ammonia. 

 Sulphate of Copper (Blue 



Vitriol). 



Sulphate of Iron. 

 Sulphate of Magnesia 



(Epsom Salts). 

 Sulphate of Soda. 

 Sulphate of Zinc. 

 Sulphate of Nickel. 

 Sulphate of Cadmium. 

 Tartaric Acid. 

 Uric Acid. 



