Mineral Resembling Meerschaum 273 



is strong reason to expect pseudomorphous humite or chon- 

 drodite to occur in this locality and in such association, and 

 equally good reasons why olivine should not yield such pseu- 

 domorphs. In the first place in the deposits of magnetite of 

 southeastern New York at Brewster's and in Orange county, 

 chondrodite, humite, and clinohumite are all found and at the 

 Tilly Foster mine in particular all three occur with magnetite 

 and an earthy serpentine or talcose material in addition to 

 other constituents. In Massachusetts, chondrodite is found, 

 at Lee, and Tyringham.* It is also found "in the pre-Cam- 

 brian limestone at the mouth of Cole's Brook, at the railroad 

 cutting west edge of large bed, in reddish and grayish grains 

 changing into serpentine"t and from the description of this 

 locality it is not more than a mile from the locality from which 

 the material under discussion was obtained, and probably in 

 the same formation. The determination of the Massachusetts 

 mineral has however depended upon other than crystallo- 

 graphic means and as the mineral is granular in all the local- 

 ities mentioned it is possible that in the western part of the 

 state at least it is to be referred to humite. So far as can be 

 learned, crystallized olivine in good-sized crystals has not been 

 noted in Massachusetts, Connecticut, Vermont, or New York, 

 but it has been found in New Hampshire though not in good 

 crystals. 



The angles on Mr. Roe's hampshirite are compared below, 

 with those of humite. (See pi. vii.) 



TABLE OF CRYSTAL MEASUREMENTS 



From these measurements it is seen that the crystal ap- 

 proaches one of the types found at \\>rmland in Sweden* 



*Dana, J. D., System of Mineralo&y, 6th edition. 1S92, p. 1059. 



tEmtrson, B. K., U. S. Geol. Sur. Bull. 126, 1895, p. 54. 



jFace not shown in figrure. 



♦Sjogren, H., Zeits, fur Kryst. and Min., vii p. 344 et seq. and pi. vil. 

 Also Hintze, C, Handbuch der Mineralogie, vii., p. 379, Fig. 147, 1897. Also- 

 Dana, System of Mineralogy, 6th edition, p. 535, 1892. 



