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MAGIC STONES AND ELECTRIC GEMS            27
Diamonds." In marked contrast with the large examples we have noted, many crystals of quartz are so small that 200,000 would have an aggregate weight of but one ounce and yet many are perfect crystals and doubly terminated.
The presence of white quartz pebbles in some graves of the Indian Moundbuilders, appears to be indicated to a satis­factory extent in the case of certain specimens from the Etowah Mound in Georgia; these pebbles, which form part of the Steiner collections in the United States National Museum, were not, however, worked or polished in any way, nor are there any traces of use for ornament or decoration. On the other hand, white quartz pebbles from the Pueblo region of the Southwest offer undeniable signs of having been long used and are of frequent occurrence ; some of these have been found in graves. In connection with the probable reasons determining their presence the designations "fire stones " or ' ' charms ' ' have been given them ; some specimens of this worked quartz had evidently been worn as pendants, while others had probably been regarded as fetishes.45
It is most interesting to note that the superstitious use of these objects in burials was so widespread as to prove that it must have been due to some inherent property or properties in white. stones, and especially in pebbles of white quartz, which appealed very strongly to the mind of primi­tive man. That, as has been noted above, the conception of purity should be associated with whiteness, in its contrast to any obscure color, is natural enough, and rests upon the association of spotless cleanliness with moral purity, and very probably the sparkles of light emitted by a bright piece of quartz, normally or on percussion, brought this material into some connection with the worship of fire, or of fire-gods.
* From letter of Mr. Neil M. Judd, Assistant in Archasology in the United States National Museum, communicated by Dr. W. H. Holmes, Head Curator of the Department of Anthropology in that institution.