386 CHAEACTEEISTIC. . 250. 



fracture. The following characteristic marks refer to mi- 

 nerals of a red, yellow, brown, or black streak ; and as the 

 individual gives none of these, its streak being uncoloured, 

 these characteristic marks do not come into consideration. 

 The next mark requires, that if hardness be = 4*5 and less, 

 the streak should be yellow, red or black ; but hardness 

 is = 6-5, therefore the colour of the streak indifferent. If 

 hardness be = 6*5 and more, and streak uncoloured ; then 

 specific gravity must be = 6-5 and more. New this condi- 

 tion takes place ; hardness is = 6-5 ; streak is uncoloured. 

 But also the conditioned character takes place, specific 

 gravity being = 6-9, which is greater than 6-5. 



In regard to the individual, which is to be determined, 

 all the characteristic marks constituting the Character of 

 the order Ore, may be divided into two parts. The first 

 part contains those which refer to the individual ; the se- 

 cond those which do not ; the last evidently cannot be de- 

 cisive. But with the first, all the properties of the indi- 

 vidual concur. These properties agree consequently with 

 the whole character of the order, as far as it is applicable 

 to the individual, and determine it to belong to the order 

 Ore, or, in shorter terms, to be an Ore. 



It will be advisable to beginners, who do not yet possess a 

 sufficient practice in the use of the Characteristic, also to 

 compare the characters of the remaining orders, which will 

 enable them to find out any error they might have com- 

 mitted in the comparison of the individual with the charac- 

 ters of the preceding orders. In the present case, the 

 non-metallic appearance excludes the individual from the 

 orders Metal, Pyrites and Glance; hardness from the order 

 Blende; and both hardness and specific gravity from the 

 order Sulphur. This fully confirms the above determina- 

 tion, and we must now return to the order Ore for com- 

 paring the properties of the individual with the generic 

 characters which the order contains. 



Considering again hardness and specific gravity as pro- 

 minent, the individual will be immediately excluded from 

 the genera Titanium-ore, Zinc-ore, and Copper-ore, but 



