762 



REPORT OF NATIONAL MUSEUM, 1897. 



Quartz. 



Amethyst. 



Smoky. 



Citrine. 



Rose. 



C'otterite. 



Chalcedony. 



Chrysoprase. 



Prase. 



Plasma. 



Agate. 



Flint. 



Jasper. 



liasanite. 



Beekite, etc. 

 Tridymite. 

 Christobalite. 

 Riitile. 

 Octahedrite. 

 Brook ite. 



Arkansite. 



Eiimauite. 

 Baddeloyite. 

 Cassiterite. 



Ainalite. 

 Plattnerite. 

 Polianite. 

 Pvrolusite. 



Corundum. 



Kuby. 

 Sapphire. 

 Emery. 

 Hematite. 



Martite. 

 L.^iigbauite. 



(Iroup C. 

 SiO.2. 



Hexagonal ; rbombo- 

 bedral. 



SiOi. 

 SiO,. 

 Ti02. 

 TiOi. 

 TiOo. 



ZrOj. 



SnO,. 



PbO,. 

 MnOi. 

 MnO,. 



Group 7. 



AliOs. 



Fe.203 



Mn(Mn,Si)03. 



Orthorhombic. 



Tetragonal. 



Tetragonal. 



Tetragonal. 



Orthorhombic. 



Monoclinic. 

 Tetragonal. 



Tetragonal. 

 Tetragonal. 

 Orthorhombic ( ' 



Hexagonal; rhombo- 

 hedral. 



Hexagonal; rhombo- 

 hedral. 



Hexagonal ; rhombo- 

 hedral. 



Contains also Sb>0:! and FejOs 



Bnicito. 



Nemalite. 

 Manganbrucite. 

 Ironbrncite. 

 Pyrochroite. 



B. HYDROXIDES. 



Group 1. 



Mg(OH),. 



Mn(0H).2 



Hexagonal ; rhombo- 

 hedral. 



Hexagonal ; rhombo- 

 hedral. 



