26 Kraus and Cook — Datolitefrom Westjield, Mass. 



of crystallization for these crystals differ but slightly from 

 those usually accepted, as is shown by the following : 



Westfield a:b: c= 0-63482 : 1 : 1-26567 £ = 90° 9' 



Danaf a:b:c=z 0*63446 : 1 : 1.26574 (3 = 90° 8f 



The measurements give the following results : 



m : 



m" 



= (110) 



m x : 



™'x 



= (on) 



a 



C 



= (100) 



I : 



I' 



= (130) 











= (120) 



r 



r'" 



=r (230) 



m z 



m 'z 



= (0110) 



t 



t' 



= (013) 



9 



9 



= (012) 



m y 



m y 



= (067) 



a 



m x 



= (100) 



a 



n 



= (100) 



a : 



/8 



= (100) 



a 



Q 



= (100) 



a' 



: v 



= (loo) 



a' 



: e 



= (100) 



a' 



A 



= (100) 



a' 



/* 



= (100) 



a' 



: k 



= (loo) 



a 



X 



= (100) 



a' 



M 



= (100) 



e 



V 



= (001) 



c 



: a 



= (001) 



m 



X 



= (100) 



m 



n 



= ( 110 ) 



m! 



V 



= (Ho) 



m! 



b 



= (Ho) 



rn' 



e 



= (I 10 ) 



rri 



A 



= (HO) 



m! 



^ 



= (iio) 



m' 



: n z 



= (Ho) 



m 







= (iio) 



m 



• rn x 



= (no) 







: x 



= (120) 







: n 



= (120) 







• P 



= (120) 



o' 



: M 



= (120) 



o' 



: u' 



= (I 20 ) 



o' 



: a 



= (120) 



o 



™ x 



= (120) 







: ir 



= (120) 



r 



: 7T 



= (230) 



9 



V- 



= (012) 



9 





= (012) 





Observed 



L. 



Calculated. 



(110) = 



(oil) 



(001) 



(130) 



64° 



49 /H 









103 



22 



30"* 







89 

 55 



51* 

 19 







55° 



24' 30' 



(120) 



76 



25 





76 



29 



(230) 



87 



13 





87 



11 



(0110) 



14 



38 





14 



25 



(013) 



45 



42 



30 



45 



45 



(012) 



64 



45 



15 



64 



38 30 



(067) 



94 



39 





94 



46 



(Oil) 



89 



56 





89 



54 30 



(111) 



38 



57 





38 



56 



(121) 



53 



44 





53 



44 



(122) 



58 



12 





58 



15 30 



(in) 



39 







30 



38 



59 



(112) 



49 



59 





49 



57 



(113) 



58 



34 



45 



58 



32 30 



(114) 



64 



47 





64 



41 



(115) 



69 



2 





68 



44 



(102) 



45 



1 





45 





(122) 



57 



24 





57 



49 



(103) 



33 



36 





33 



35 



(104) 



26 



35 





26 



29 



(102) 



53 



21 





53 



15 



(HI) 



22 



57 



30 



■ 22 



54 



(111) 



22 



58 



30 



22 



57 



(223) 



32 



28 



45 



32 



35 



(112) 



40 



19 





40 



13 



(113) 



51 



56 





51 



49 



(114) 



59 



20 





59 



15 



(1-1-10) 



76 



49 





76 



52 



(121) 



25 



41 





25 



38 



(Oil) 



65 



9 





65 



7 30 



(102) 



63 



59 





64 



3 



(111) 



29 



40 





29 



38 



(121) 



17 



14 





17 



7 30 



(122) 



31 



45 





31 



43 



(123) 



42 



50 





42 



32 



(124) 



51 



1 





51 



5 



(on) 



51 



57 





51 



57 



(231) 



13 



13 





13 



13 



(231) 



10 



9 





10 



15 



(114) 



29 



16 





29 



13 



(1-4-10) 



11 



17 





11 



19 



f These values of Dauber, modified as indicated on page 22, are also accepted 

 by Groth, Goldschrnidt and others. 



