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Cattelle Diamonds Digest

Ch. 18: An Expensive Farce Page of 448 Cattelle Diamonds Digest Text size:minusplusRestore normal size  Mail page Print this page
       
     
 
422
THE DIAMOND
 
 

 
 
DIGEST
Hardness, 10, Moh's scale.
Specific gravity. 3.48 to 3.52. (Carbonado, 3.14 to
3.41) Index of refraction. 2.439. Singly refractive, reflective and dispersive. Total reflection from inner facets at 24 ° 15'. Composition: pure carbon. Crystallization. Isometric.
Cleavage perfect, parallel to the facets of the octahedra. Fracture, conchoidal. Streak, gray to black: the finer the material the darker
the powder. Luster, adamantine. Transparent. Phosphoresces in the presence of radium; occasionally
after exposure to heat or solar light. Electric in the rough. Though a nonconductor, it be­comes positively electric, by friction. Infusible, not acted upon by acids or alkalies, but burns
in oxygen under intense heat without appreciable
residue to carbon dioxide. Colors, white and with tints of blue, yellow, brown,
green, and pink. Also in red, green, blue, yellow,
brown, and orange of decided color. Common imperfections, carbon spots, inclusions of titanic
iron, etc., fractures, feathers, bubbles and white specks.
 
 

 
       
Ch. 18: An Expensive Farce Page of 448 Cattelle Diamonds Digest
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