126 



TRANSACTIONS OF THE 



THIRD ORDER— SPAR. 



Not opaline. 



H. from 2| to 6J. 



G. from 2, 48 to 8. 



The thin laminae inflexible. 



Cleavable through the basis, unlike the phyllite, 

 uncolored streak, and G. less than 2, 6 or more 

 than 3 ; or tetragonal. 



H. from 2| to : G. 5, 4 and more, and an un- 

 colored, or green streak, Ex.; sulphato-tricar- 

 bonate of lead, corneous lead. 



H. 4§ and more, without pearly lustre ; unlike 

 phyllite, and without having rhombic pris- 

 matic, or brachy- diagonal cleavage of the first 

 kind. Ex. Scorodite, Br. Green, brown and 

 vanadic, from Mexico, rhomboidal leadspar, 

 diprismatic leadspar, Jam.; baryto-calcite, arra- 

 gonite, fluor, alum-stone, apatite, pyramidal 

 tungsten, Jam. &c. 



G. 2, 5 and less ; not tesseral, Ex. pharmaco-si- 

 derite, cupreous sulphate of lead ; cupreous sul- 

 phato-carbonate of lead ; red and yellow lead- 

 spar ; heavy spar and celestine, sulphate of 

 lead, strontianite, witherite, rhombohedral cala- 

 mine, rhombspar, rhomboidal red manganese ; 

 sparry iron, carbonate of lime, anhydrite, crio- 

 lite, wawellite? herderite, datolite, wagnerite, 

 ytterite, yttrocerite &c. 



