MINERALOGY. 489 



ORDER XII. BLENDE. 



Hardness = 1.0, 4.0. Sp. gr. = 3.9, 8.2. If the lustre is me- 

 tallic, the colour is black ; if not metallic, it is adamantine. If 

 the streak is brown, white, or gray, the sp. gr. is between 4.0 and 

 4.2, and the form tessular. If the streak is red, the sp. gr. =r 

 4.5, and more, and the hardness = 2.5, and less. If the sp. gr. 

 =. 4.3, and more, the streak is red. 



Gen. 1. Manganese Blende. 2. Zinc Blende, or Garnet Blende. 

 3. Antimony Blende, or Red Antimony. 4. Ruby Blende. 



ORDER XIII. SULPHUR. 



No metallic lustre. Colour yellow, red, or brown. Prismatic. Hard- 

 ness = 1.0, 2.5. Sp. gr. 1 .9, 3.6. If sp. gr. above 2.1, the 

 streak is yellow or red. 



Gen. 1. Sulphur. 



CLASS III. 



Specific gravity under 1 .8. If liquid, the smell is bituminous ; 

 if solid, is tasteless. 



ORDER I. RESIN. 



Hardness = 0, 2.5. Sp. gr. = 0.7, L6. If sp. gr. = 1.2, and 

 more, the streak is white or gray. 



Gen. 1. Mellite, or Honey-stone. 2. Mineral Resin. 



ORDER II. COAL. 



Streak brown and black. Hardness = 1.0, 2.5. Sp. gr. = 1.2, 

 1.5. 



Gen. 1. Mineral Coal. 



APPENDIX. NEW MINERALS. 



Professor Jameson concludes his system by giving a list of newly 

 described or imperfectly known minerals, such as Allophane, Bismu- 

 thic Silver, Blaedite, Brewsterite, &c. 



