488 MINERALOGY. 



Gen. 1. Andalusite. 2. Corundum. 3. Diamond. 4. Topaz. 5. Eme- 

 rald. 6. Quartz. 7- Axinite. 8. Chrysolite. 9.Boracite. 10. Tour- 

 maline. 11. Garnet. 12. Zircon. 13. Gadolinite. 



ORDER VIII. ORE. 



Hardness = 2.5, 7. Sp'. gr. 3,4, 7.4 If the lustre is metal- 

 lic, the colour is black ; if not metallic, it is adamantine or imper- 

 fect, or semi-metallic lustre. If the streak is yellow or red, the 

 hardness 3.5, and more, and the sp. gr. 4.8, and more. If 

 the streak is brown or black, the hardness = 5.0, and more, or 

 the cleavage monotomous. If the hardness = 4.5, and less, the 

 streak is yellow, red, or black. If the hardness = 6.5, and more, 

 the streak is white or gray, and the sp. gr. 6.5, and more. 



Gen. 1. Titanium Ore. 2. Zinc Ore. 3. Red Copper Ore. 4. Tin 

 Ore. 5. Wolfram Ore. 6. Tantalum Ore. 7. Uranium Ore. 8. Ce- 

 rium Ore. 9. Chrome Ore. 10. Iron Ore. 11. Manganese Ore. 



ORDER IX NATIVE METAL. 



Lustre metallic ; not black. Hardness = 0.5. Sp. gr. = 5-7^ 

 2.0. If gray, it is malleable, and the sp. gr. 7-4, and more. 

 If the hardness equal 4.0, it is malleable. 



Gen. 1. Arsenic. 2. Tellurium. 3. Antimony. 4. Bismuth. 5. Mer- 

 cury. 6. Silver. 7. Gold. 8. Platina. 9. Iron. 10. Copper. 



ORDER X. PYRITES. 



Lustre metallic. Hardness = 3.5, 6.5. Sp. gr. = 4.1, 7.7. If 

 hardness = 4.5, and less, the sp. gr. is less than 5.0. If sp. gr. 

 = 5.3, and less, the colour is yellow or red. 



Gen. 1. Nickel Pyrites, or Copper Nickel. 2. Arsenic Pyrites. 3. Co- 

 balt Pyrites. 4. Iron Pyrites. 5. Copper Pyrites. 6. Undeter- 

 mined Pyrites. 



ORDER XL GLANCE. 



Lustre metallic. Gray black. Hardness = 1.0, 4.0. Sp. gr. = 

 4.0, 7-6. If sp. gr. under 5.0, and cleavage monotomous, the 

 colour is lead gray. If sp. gr. above 7-4, the colour is lead gray. 



Gen. 1. Copper Glance. 2. Silver Glance, or Vitreous Silver. 3. 

 Galena, or Lead Glance. 4. Tellurium Glance, or Black Tel- 

 lurium. 5. Molybdena, or Molybdena Glance. 6. Bismuth Glance. 

 7. Antimony Glance. 8. Melane Glance. 



