TAB. XIII. 



CALX carbonata var. aequiaxis. 

 Crystallized Carbonate of Lime, var. equiaxed. 



Class 2. Earth. Order I. Homogeneous. 



Gen. 1. Lime. Spec. 2. Carbonate of Lime. 



Div.l. Crystallized. Far. 1. Ciystal Equiaxed. 



B 



Syn. Chaux carhonatee equiaxe. i.Hauy, v. i. 132. 



S 



I his crystal is formed of six rhomboidal faces the angles 

 of which are 114 18' $6 n } and 6$° 41' 4", forming a very 

 obtuse rhomb_, the axis of which is equal to that of the 

 rhomb which it encloses. Haiiy, v. 1. 133. 



These and their modifications are found plentifully in 

 Durham and Cumberland, according to specimens sent me 

 by the Rev. Mr. Harriman and Mr. Oliver. I have had 

 fine specimens from Newcastle by favour of Mr. Wood- 

 house, found in coal mines. They occasionally occur 



wherever other calcareous substances are found. 



The upper figure is part of a fine specimen with clearer 



crystals than usual, for they generally incline to a milky 



