156 REPORT UNITED STATES GEOLOGICAL SURVEY. 



lY. FLUOEINE COMPOUNDS. 

 Fluorite (159). (Ohlorophanite). 



V. OXYGEN COMPOUNDS. 



A. OXYDS. 



1. Oxyds of elements of series I. 



A. Anhydrous. 



Cuprite (172). 

 Zincite (176). 

 Melacouite (178). 

 Hematite (180). 

 Iserite a81 A). 

 Spinel (183). 

 Magnetite (186). 



Goethite (204). 

 Limonite (206). 



Franklinite (188). 

 Chromite (189). 

 Uraninite (190). 

 Entile (193). 

 Minium (197). 

 Pyrolusite (199). 



J5. Hydrous. 



Brucite (210). 

 Psilomelane (217). 



2. Oxyds of elements of series 11. 

 Molybdite (224). 



3. Oxyds of carbon-silicon group. 



Quartz (231). ' | Opal (232). 



A. TERNARY OXYGEN COMPOUNDS. 

 1. SILICATES. 



A. Anhydrous. 



Hypersthene (235). 

 Wollastonite (237). 

 Pyroxene (238). 

 Ehodonite (241). 

 Anthopbyllite (246). 

 Amphibolite (247). 

 Arfvedsonite (248). 

 Beryl (254). 

 Chrysolite (259). 

 Willemite (266.) 

 Garnet (271). 

 Zircon (272). 

 Vesuvianite (273). 

 Epidote (276). 



Chrysocolla (346). 

 Calamine (361). 

 Prehnite (363). 



Phlogopite (288). 

 Biotite (289). 

 Astropbyllite (292). 

 Muscovite (293). 

 Lepidolite (294). 

 Leucite (309). 

 Labradorite (311). 

 Andesite (312). 

 Oligoclase (314). 

 Albite (315). 

 Orthoclase (316). 

 Tourmaline (320). 

 Staurolite (333). 



B. Hydrous. 



Apophyllite (370). 

 Allophanite (374). 



