of Chondrodite, Humite and C linohumite. 201 



logue 'No. 2064, which had been presented by W. Sartorius 

 von Waltershausen. The crystals are light wine yellow, trans- 

 parent and in habit like the simple crystals figured by vom 

 Rath.* The associated minerals are, forsterite, biotite, spinel, 

 calcite and a little vesuvianite. The measurements that served 

 for the identification of the mineral are as follows : 



Measured. Calculated. Measured. Calculated. 



C a e 4 , 



001 a 101= 79° 



12' 



79° 



1U' 



C a 7*s, 



001a 127 = 60 c 



42' 



60° 42" 



c~e 3 , 



001 a 103 = 60 



13 



60 



12 



Ca?"3, 



001 a 1-2-11= 48 



35 



48 35 



Ca e 2 , 



001 a 105 = 46 



24 



46 



20 



C A ?*i, 



001 a 1-2-15=39 



46 



39 44£ 



c a e u 



001^ 107 = 36 



49 



36 



48£ 



C A To, 



001 a 1-2-13=43 



49 



43 49 



c a -ei 



,001 a 107 =36 



49 



36 



AH 



C a r 4 , 



001a 129 = 54 



10 



54 11 



c a in, 



001 aOU = 54 



43 



54 



45 



C ~ « 2 , 



001 a 115 = 57 



2 



57 24 



C ~ *!, 



001 a016 = 43 



19 



43 



194 











The specific gravity, when taken with the heavy solution, 

 varied between 3*184 and 3'222 and this being almost identi- 

 cal with that of forsterite the yellow clinohumite crystals had 

 to be separated from the colorless forsterite by hand picking. 

 The specimen only afforded 0'3879 grams of the mineral and 

 the analysis was made on this small portion by fusing the 

 whole with dry sodium carbonate in the Gooch crucible to 

 obtain the water, soaking out the fusion and carrying on the 

 analysis in the usual way. In the course of the analysis a most 

 unusual accident occurred. The platinum crucible in which 

 the fusion was made broke, and it was not discovered till, on 

 soaking out the fusion, it was found to leak. The break was 

 of such a nature that the water determination was not lost and 

 the mechanical loss, caused by the leaking, was slight and, in 

 all probability, evenly distributed on the remaining constit- 

 uents. It is assumed that the deficiency of the analysis, 

 amounting to about 2 per cent, was caused by this accident, as 

 otherwise the analysis was carried on with more than usual 

 care. The analysis is given beyond under a as it stands in the 

 note book and under b after distributing the deficiency of 2*28 

 per cent among all of the constituents except water. 



The material for the second analysis was derived from a 

 specimen in the Yale College cabinet, catalogue ]STo. 4143. 

 The crystals are chestnut brown in color and are associated 

 with forsterite, biotite, vesuvianite and a little calcite. Their 

 identity as clinohumite is shown by the following measure- 

 ments. 



Measured. Calculated. Measured. Calculated, 



c a -e u 001 a 107 = 36° 45' 36° 4SJ-' c a i 2 , 001 a 014 = 54° 40' 54° 45' 

 c~e 6j 001 a 109 = 30 00 30 12 c a r 3 , 001 a 1'2-11= 48 28 48 35 



c/ve 2 , 001 a 105 =46 19 46 20 c>.r s , 001a 127 =60 41 60 42 



uej, 001 a 103 =60 12 60 12 ca-w 2 ,001a 115 = 57 2 57 2-J- 



CAe 4 , 001 a 101 =79 9 79 11£ Ca-w 4 , 001a 111 =82 49 82 37 



Ca^, 001 a 016 = 43 19 43 19£ 



* Pogg. Ann., Erg. B. v, Tables VI, flgs. 1 and 7 and VII, fig. 10. Sixth 

 edition of Dana's Mineralogy, page 538. 



