I found this several years ago and just came across it again recently. This is an old article on the Mineralogical Society of America’s web site about a Topaz dig at Devils Head. This is from American Mineralogist journal from 1945.
It talks about dig(s) during the summer of 1934 of Edwin Over and Arthur Montgomery. The article is technical and shows detailed drawings and crystallography of the Topaz they found at this locale.
All of the journal is posted online here and free through 1999.
A few takeaways…
- it is noteworthy that the pockets especially rich in iron are poor in topaz (pg 355)
- Within the pockets the microcline masses reach 6 or 8 inches in greatest dimension; well-formed crystals are relatively rare and they do not exceed a size of two inches
- Quartz occurs in smoky crystals, in most cases slender and distorted
I have yet to find Topaz at Devils Head, but most of the larger smoky quartz I find is as they describe.