142 



ANNALS NEW YORK ACADEMY OF SCIENCES 



"Diabantite." 



From Farmington Hills, Connecticut. Mean of two analyses by 

 G. W. Hawes; "A unisilicate of the pyrosclerite group, with the formula, 

 (§1^3 + J Ai) Sig + 3 H." Dana states that the figures "correspond to the 

 formula Rja (112)2 Sig Ogg + 9 aq., which is near to that of pyrosclerite," and 

 also: 

 "Comp.- H,8 (Fe, Mg),^ Al, S\, O,, or 



12 (Fe, Mg)0.2Al203. 9 Si O3. 9 H2O." 



In my calculation of the mineral constitution I have applied to pyroxene, 

 perhaps unwisely, the actual analysis of that mineral by Hawes from an 

 outcrop of diabase in the same region. It is apparent that " diabantite" is 

 not identical with "diabantachronnyn," nor is it at all likely that any two 

 specimens of either mixture are ever identical. 



"JoUyte." 



From Bodenmais, Bavaria. Analysis by von Kobell, 

 Formula: (J R^ + § Ai)2SP + 4 H; it "resembles a 

 which the iron is replaced by alumina" (Dana). 



hisingerite 



m 



