EMERY MINE OF CHESTER, MASS. 



49 



be regarded as an aluminate of iron, the rock called emery 

 coming from Naxos and other well-known localities is not that 

 compound, and that if one is emery the other is not. But as I do 

 not take their view of the matter, I consider the Chester mineral 

 as true an emery as that of Naxos. 



As there seems to be some mistake and incorrect quotation 

 in regard to my analyses of emery and corundum, I reproduce 

 the tabular statement of the analyses and effective hardness, 

 referring the reader to the original paper for a correct view of 

 what is understood by the effective hardness. 



No. 



LOCALITY. 



Emery. 



Kulah... 

 Samos ... 

 Nicaria .. 

 Kulah... 

 Naxos ... 

 Nicaria . 

 Naxos ... 

 Ephesus 

 Kulah... 



Corundum. 



Sapphire of India 



Kuby of India 



Corundum, Nicaria 



Corundum, Asia Minor 



Corundum, Asia 



Corundum, India... 



Corundum, Asia 



Corundum, India 



Emery. 



Chester, Massachusetts. 

 Chester, Massachusetts. 

 Chester, Massachusetts. 

 Chester, Massachusetts. 

 Chester, Massachusetts. 





P I 0> 



57 

 5G 

 56 

 58 

 46 

 46 

 44 

 42 

 40 



4.28 

 3.98 

 3.75 

 4.02 

 3.75 

 3.74 

 3.87 

 4.31 

 3.89 



100 

 90 



77 

 65 

 60 

 58 

 57 

 55 



40 



89 

 45 



4.06 



3.92 

 3.60 

 3.89 

 3.80 

 3.91 



CO J] POSITION. 



1.60 

 0.68 

 1.66 

 2.86 

 3.74 

 3.10 



63.50 

 70.10 

 71.06 

 63.00 

 58.58 

 75.12 

 69.46 

 60.10 

 61.05 



97.51 



97.32 

 92.89 

 87.52 

 86.62 

 93.12 

 87.32 

 84.56 



44.01 

 50.02 



51.92 



74.22 

 84.02 



: ® 2. 

 : o ■=;'■ 



32.25 

 22.21 

 20.32 

 30.12 

 24.10 

 12.06 

 19.08 

 33.20 

 27.15 



1.89 

 1.09 

 1.67 

 7.50 

 8.21 

 0.91 

 3.12 

 7.06 



50.21 

 44.11 

 42.25 

 19.31 



9.63 



1.61 

 4.00 

 4.12 

 2.36 

 3.10 

 6.88 

 2.41 

 1.80 

 9.63 



0.80 

 1.21 

 2.05 

 2.01 



3.85 

 0.96 

 2.61 

 4.00 



3.13 

 3.25 



5.46 

 5.48 

 4.81 



By the above it will be seen that the magnetic oxide of iron 

 in the emery of Naxos, Ephesus, etc., varies from 13 to 33 per 

 cent., the water from 1.9 to 5.0 per cent., the silica from 1.6 to 

 9.6 per cent. All of these ingredients form minerals apart from 

 the corundum, which is represented by the principal portion of 



