364 Arrangement of Minerals, 



Genus VIII. Cerium-Ore. 

 Amorphous. Streak white. Hardness = 5.5. Sp. gr. 4.9 — 

 5.0. 



1. Uncleavable Cerium-Ore. 



Genus IX. Chrome-Ore. 

 Tessular. Streak brown. Hardness = 5.5. Sp. gr. = 4.4 — 4.5 

 1. Octahedral Chrome-Ore. 



Genus X. Iron-Ore. 

 Tessular. Rhombohedral. Streak red, dark brown, black. Hard- 

 ness = 5.0 — 6.5. Sp. gr. = 4.4 — 5.3. 



1. Axotomous Iron-Ore {Titanitic Iron of Gastein), 2. Hexahedral 

 Iron-Ore (^Magnetic Iron-sand. Iserine). 3. Octahedral Iron- 

 Ore {^Magnetic Iron-ore, Black Iron-ore), 4. Dodecahedral 

 Iron-Ore {Franklinite), 5. Rhombohedral Iron-Ore {Iron- 

 glance, Bed Iron-ore), 



Genus XI. Brown Iron- Ore. 

 Prismatic. Amorphous. Streak yellowish-brown. Hardness = 

 4.5 — 5.5. Sp. gr. = 3.4 — 4.3. 



1. Prismatic Brown Iron-Ore. 2. Prismatoidal Brown Iron-Ore. 

 3. Uncleavable Brown Iron-Ore {Stilpnosiderite). 



Genus XII. Melane-Ore. 

 Pyramidal. Prismatic. Hemiprismatic, and Tetarto- prismatic. 

 Colour black. Streak grey, brown, black. Hardness = 5.0 — 7.0. 

 Sp. gr. =3.4 — 5.9. 



1. Anorthitic Melane-Ore {Allanite). 2. Hemiprismatic Melane- 

 Ore (GadoHnite), 3. Diprismatic Melane-Ore {Lievrite). 4. 

 f Prismatic Melane-Ore {Polymignite). 5. Dystomous Melane- 



Ore {Mschynite). G. Pyramidal Melane-Ore {Ferguso7iite), 7. 

 Prismatoidal Melane-Ore {Cerine). 



Genus XIII. Manganese-Ore. 

 Pyramidal. Prismatic. Amorphous. Streak dark (not yellow- 

 ish), brown, black. Does not affect the magnet. Hardness = 2.0 — 

 6.5. Sp. gr. =4.0 — 4.9. 



1. Pyramidal or Black Manganese-Ore {Manganese oxyde hydrate, 

 H.Hausmannite). 2. Brachytypous Manganese-Ore {Braunite). 

 3. Uncleavable Manganese-Ore {Psilomelane). 4. Prismatoidal 

 Manganese-Ore {Grey Manganese- Ore). 6. Prismatic Man- 

 ganese-Ore {Pyrolusite), 



Order II. METAL, or NATIVE METAL. 



Metallic. Not lead-grey, not black. Hardness = 0.0 — 

 7.0. Sp.gr. =5.7 — 20.0. 



