. 183. OF COMPOUND MINERALS. 255 



in general, such as have one of their dimensions considerably 

 surpassing the others, are fixed with one of their ends to a 

 common point of support, from which they diverge in every 

 direction. The mode of the formation of such globular 

 shapes is more apparent, if the number of the individuals 

 is not so great that they touch each other on all sides. 

 The implanted globules must necessarily be incomplete, 

 because the implanted crystals of which they consist, are 

 themselves incomplete, and therefore they leave no im- 

 pression when detached from their support. Globular 

 shapes of this kind occur very frequently in prismatic 

 Kouphone-spar, in macrotypous Lime-haloide, in prismatic 

 Hal-baryte, &c. 



If, during the formation of several globules, they come 

 into contact with each other, there will arise reniform and 

 botryoidal shapes, which therefore are nothing else than 

 several implanted globules joined together. The single 

 globules are separated from each other by faces of composi- 

 tion. Rhombohedral Iron-ore very often affects shapes of 

 this description, in which species they are known under 

 the name of Haematites. They occur also in the varieties 

 of rhombdhedral Quartz, called Calcedony. In these very 

 often the individuals are so delicate, that they withdraw 

 themselves from observation. 



Into the present class belong also the fruticose shapes, 

 which possess some resemblance with parts of certain 

 plants, and most of those commonly called dendritic, the 

 latter of which may penetrate throughout the whole mass, 

 or only be superficial. 



The second division contains, among others, the denti- 

 form, the filiform, and the capillary shapes. These arise, if 

 one implanted crystal is the support of another, this of a 

 third, and so on ; so that rows of such crystals are pro- 

 duced, as we may observe them very often differently bent 

 in hexahedral Silver, in octahedral Copper, and also in 

 octahedral Iron ; in the last of these, however, they have 

 not yet been found disengaged. If the crystals join so very 

 intimately, that it is no longer possible to distinguish them 



