123 



I-Iard massive variety of oxide o£ manganese. (See page 87.) Psilomelane. 

 Virginia, Queensland, New Zealand, Sweden, Merionethshire 

 (with carbonate), "Westphalia, Spain. 



Earthy peroxide of manganese. Arizona, The Caucasus. WaA. 



Crystallised sesquioxide of maganese. The Harz. Manganite. 



Carbonate of manganese. Colorado (crystallised), Tasmania, Ehodocrosite. 

 France. 



Silicate of manganese. Jius.sia, New Jersey.* (See also Zinc Rhodonite. 

 case 87.) 



See under Zinc. rranklinite. 



The Spanish and Caucasian ores are of special importance, so 

 much of the world's supply of manganese coming from those 

 sources. 



URANIUM. Case 90. 



Uranium ores are used in staining glass and also in photo- 

 graphy ; they are scarce and valuable. 



Uranium ochre (709) &ndi pitclihlende (711) from Cornwall are (Ochre. 

 , ,, ., , t Pitchblende, 



exhibited. 



Hydrous sulphide of uranium. 3447, Colorado. Johannite. 



3478, South Dakota. Uran. Phosph. 



TUNGSTEN.t Case 90. 



Iron-manganese-tungstate. Queensland, Tasmania, Cornwall, Wolfram. 

 Saxony. 8656, 8651, two crystallised specimens from the 

 Erzegebirge. Until recently all the wolfram used in the Arts 

 came from the tin mines of Cornwall and Saxony. 



Lime-tungstate. Victoria, New Zealand, Eussia, Saxony, scheelite. 

 The specimens from Zinnwald, The Erzegebirge, Saxony, show 

 small crystals (octaliedrd) . 8677, from the same place, shows 

 scheelite traversing wolfram in net-like fashion ; it has evidently 

 resulted from the alteration of the latter mineral. 



Manganese-tungstate. Nevada (3858), Colorado (3445). Hiibnerite. 



Iron-tungstate. Colorado, 8019. Perberite. 



* The variety from New Jersey contains zinc, and is known as fowlerite. 

 t For description and uses of these ores, see page S9. 



