120 Mr HAIDINGER'S Mineralogical Account of 



indiscriminately applied to every one of the species, or at 

 least to those which most commonly occur in nature. I have 

 again compared, in this respect, some of the treatises on mine- 

 ralogy, and given the synonyms as nearly exact as I could. 

 Those of HAUY I have left out, because this author, though of 

 the greatest importance where regular forms can be made out, 

 is remarkably deficient in the particular point of the ores of 

 manganese. The undeterminable varieties, such as black-wad 

 and others, I have thought best to omit altogether from the ge- 

 neral descriptions, as their connection with the rest is not quite 

 clear ; and I have done so the more willingly, as Dr TURNER 

 has not subjected them to any chemical examination. The 

 authors and works quoted are the following : 



Handbuch der Mineralogie. By J. F. L. HAUSMANN. 



System of Mineralogy ; 3d edition. By R. JAMESON. 



Elementary Introduction to the Knowledge of Mineralogy. By W. PHILLIPS. 



Grundriss der Mineralogie. By F. MOHS. 



Treatise on Mineralogy. By F. MOHS. Translated by W. HAIDINGER. 



On the Crystalline Forms and Properties of the Manganese-ores. By W. 



HAIDINOJER, in the Edinburgh Journal of Science. 

 Handbuch der Oryctognosie. By K. C. VON LEONHARD. 



Four of the species belong to the genus Manganese-ore of the 

 system of MOHS, and they are accordingly provided with syste- 

 matic denominations. The fifth species differs so materially 

 from the rest, particularly in regard to hardness, that I hesitate 

 to assign it a place in the same genus, or even order, and there- 

 fore shall not at present propose a systematic denomination for 

 it. None of them are as yet provided with good trivial names; 

 those phrases and definitions which were used, in general con- 

 veying nothing but an imperfect, and often erroneous, allusion 

 to the chemical constitution of the species. Those which I here 

 venture to propose, have at least the property, essential to all 

 good trivial names, that they consist of one single word ; and, 



