1917 j Eakle: Minerals Associated with Crystalline Limestone 337 



would complete the two odd series, may also be present, as some 

 approximate readings indicated them, but their occurrence could not 

 be established with absolute certainty. Two very small and poor faces 

 corresponding to the forms (122) and (T22) and a line face of (Oil) 

 occur. The two new forms (142) and (T42) were line faces and gave 

 only approximate measurements. 



Another unique fact about these crystals is that for every positive 

 pyramid there is a negative one with like symbols ; but the symbols for 

 the rear faces do not correspond to the front ones. It is characteristic 

 that the crystals have three or four prism faces on their ends each 

 representing a different form. Figures 2 and 3, plate 23, show the 

 combinations on some of the crystals. Figure 3 shows the end of the 

 crystals with the rear faces drawn in the left half in reversed position. 

 Figures 4 and 5 are orthographic projections on the clinopinacoid 

 which bring out better the combination of faces. 



Only one end of the crystals is terminated, sometimes the right and 

 again the left end. The disposition of the faces indicates a lower grade 

 of symmetry as there is no apparent axis of symmetry, and the 

 crystals could belong to the hemimorphic class of the monoclinic sys- 

 tem, or to the triclinic system. The mineral is strongly tribo-lum- 

 inescent and this physical property is an evidence of a more complex 

 molecular structure. The dome faces on these crystals are identical 

 with those of all wollastonite crystals, but the terminated ends are 

 totally dissimilar. 







Measured 







Calculi 



ited 





No. of 



Forms 





P 



P 







P 





measurements 



C 001 



90°00' 



5°30' 



90°00' 



5° 30' 



25 



a 100 



90 



00 



90 



00 



90 



00 



90 



00 



30 



I 740 



59 



03 



90 



00 



59 



04 



90 



00 



7 



h 540 



49 



57 



90 



00 



50 



01 



90 



00 



8 



q 340 



35 



35 



90 



00 



35 



35 



90 



00 



10 



m 140 



13 



25 



90 



00 



13 



25 



90 



00 



13 



v 101 



90 



00 



45 



33 



90 



00 



45 



33 



22 



t 104 



90 



00 



18 



35 



90 



00 



18 



07 



1 



e T04 



90 



00 



7 



41 



90 



00 



7 



40 



1 



k T03 



90 



00 



11 



36 



90 



00 



11 



56 



1 



a T02 



90 



00 



20 



00 



90 



00 



20 



00 



19 



t T01 



90 



00 



39 



33 



90 



00 



39 



35 



24 



g on 



5 



12 



45 



44 



5 



41 



44 



12 



1 



p 744 



60 



29 



62 



19 



60 



31 



63 



03 



3 



o 344 



38 



59 



51 



16 



39 



10 



51 



19 



6 



n 144 



18 



33 



45 



33 



18 



40 



45 



37 



11 



b 744 



58 



20 



61 



41 



57 



30 



60 



58 



2 



i 344 



3T 



42 



48 



37 



3T 



38 



48 



39 



7 



