I've always had a hunch that surface hoar was created through the TG metamorphism process and also, have learned at this site... i.e. turns-all-year, that facets can form on the surface (previously I had thought they could only form in the the snow pack)--this paper is quite instructive to me...
www.mtavalanche.com/gnfac/tech_pubs/near...ntribution-avalanche 
