The carmine tint of this rubellite [height 9 J inches] in contrast with the almost colorless 

 and glassy surface of the quartz crystal forms a mineral wonder. Rubellite is a lithia 

 variety of the variable silicate known to mineralogy as tourmaline and the intergrowth of 

 ■quartz and tourmaline is noticed at many localities. Invariably the quartz as a secondary 

 crystallization has formed around its mineral companion, as a foil to the showier associate 



We have touched upon the historic value of the series of Babylonian cylinders, 

 composed of various minerals such as serpentine, steatite, hematite, lapis-lazuli, 

 jasper, agate, anhydrite, amazon stone, shell, aragonite, chalcedony, marble and 

 -quartz. These cylinders date from 4000 to 400 b. c, and are inscribed with figures 

 :and names. 



To illustrate the history of gem engraving there are fine examples of Persian en- 

 graving offered by a series of fourteen Persian seals of various ages, bearing from a 

 few to several hundred words of the beautiful tracery engraving that only the Oriental 

 can accomplish with full success. 



Agatized wood from Chalcedony Park, Arizona, is well represented, some sections 

 measuring two feet across, polished as smooth as the finest mirror, and showing parts 

 of the prehistoric trees replaced by silica and oxide of iron, as if nature had painted 

 them in orange, red or brown, in pinkish or bluish hues, and in other colors, fairly 



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