ORDER VIII. AXOTOMOUS IRON-ORE. 397 



a compound state. The hexahedral crystals from Stiria, 

 occasionally combined with the octahedron, and which 

 have been considered as belonging to it, are in fact octa- 

 hedral Iron-ore. But crystals in the form of regular octa- 

 hedrons are quoted from Hoboken in New Jersey, and 

 from the Bare-hills near Baltimore in Maryland. This is 

 also the form in which the Chrome-ore occurs in St Do- 

 mingo, and in Shetland. The Stiriau has not yet been 

 found crystallised, but there are indications of cleavage or 

 composition in its interior apparently in only one direction, 

 which deserve very well the attention of mineralogists. 

 The varieties of the present species have been hitherto 

 found only in serpentine, in irregular veins and beds, which 

 seem to be of contemporaneous formation with the rock itself. 



3. The first varieties of octahedral Chrome-ore were dis- 

 covered in the department du Var in France, where they 

 form nodules and kidney-shaped masses. In Stiria it occurs 

 in the Gulsen mountain near Kraubat, in serpentine in 

 very irregular veins, traversing the rock in all pos- 

 sible directions. It is found also near Portsoy in BanfF- 

 shire, and at Buchanan in Stirlingshire, in Scotland, in 

 the latter place imbedded in limestone. It is met with 

 in large masses in the Shetland isles, Unst and Fetlar, in 

 the Bare-hills near Baltimore, and in the Uralian moun- 

 tains. At Hoboken in New Jersey, octahedral crystals of 

 it are imbedded, both in serpentine and in limestone. It 

 has also been met with in Silesia and in Bohemia. 



4. The octahedral Chrome-ore is a highly valuable mine- 

 ral for extracting the oxide of chrome, which is employed 

 either alone or in various combinations with the oxides of 

 other metals, as cobalt, lead, mercury, &c. both for paint- 

 ing on porcelain, and for painting in oil. It yields green, 

 yellow, and red pigments. 



GENUS X. IRON-ORE. 

 1. AXOTOMOUS IRON-ORE. 



Titanitic Iron, from Gastein in Salzburg. 



