Arrangement of Minerals. 363 



Ca IMEetalliferous IVIincralsa 

 Minerals in which metals, generally the chief constituents, 

 are in the native state, or combined with oxygen or sulphur. 



Order I. ORE, or OXIDE. 



Metallic, black ; not metallic. Streak not green, not blue. 

 Hardness = 2.0 — • 7.0. Sp. gr. = 3.4 — 8.0, 



Genus I. Titanium-Ore. 

 TessuUir. Pyramidal. Hemiprismatic. Streak white — pale (not 

 yellowish) brown. Hardness = 5.0 — 6.5. Sp. gr. = 3.4 — 4.4. 

 1. Prismatic Titanium- Ore (Sphene). 2. Octahedral Titanium-Ore 

 {Pyrochlore). 8. Peritomous Titanium-Ore (Titane oaryde). 4. 

 Pyramidal Titanium- Ore {Anatase). 



Genus H. Zinc-Obe, — Red Oxide of Zinc. 

 Prismatic. Streak orange-yellow. Hardness =4.0 — 4.5. Sp. 

 gr. = 5.4 — 5.5. 



1. Prismatic Zinc-Ore. 



Genus HI. Red Copper-Ore. 

 Tessular. Streak brownish-red. Hardness = 3.5 — 4.0. Sp. gr. 

 = 5.6 — 6.1. 



1. Octahedral Red Copper-Ore. 



Genus IV. Tin-Ore — Oxide of Tin. 

 Pyramidal. Streak not black. Hardness = 6.0 — 7.0. Sp. gr. 

 = 6.3 — 7.1. 



1. Pyramidal Tin-Ore. 



Genus V. Tantalum-Ore. 

 Prismatic and Hemiprismatic. Streak brownish-black. Hardness 

 = 6.0 — 6.5. Sp. gr. = 6.3 — 8.0. 



1. Prismatic Tantalum-Ore {Tantalite from Kimito), 2. Hemipris- 

 matic Tantalum-Ore {Tantalite from Bodenmais. Kolombite, 

 Gust. Rose.) 



Genus VI. Wolfram- Ore. 

 Hemiprismatic. Streak reddish-brown, dark. Hardness = 5.0 — 

 5.5. Sp.gr. =7.1— 7.4. 



1. Prismatic Wolfram^ or Tungstate of Iron. 



Genus VII. Uranium-Ore, 

 Amorphous. Streak black. Hardness = 5.5. Sp. gr. = 6.4 — 

 6.6. 



1. Uncleavable Uranium-Ore (PecAcrar, W. Urane oxydule, U.) 



