Specimen data for Genthelvite

Tom Mortimer catalog number: u647

Identification method: Visual. Tetragonal crystal shape in this environment is diagnostic of helvite-genthelvite. Per article "Pegmatite and Miarolitic Cavity Minerals of North Sugarloaf Mountain Bethlehem, New Hampshire" by Whittemore and Janules, "Rocks & Minerals" Vol 65, No. 4, these were identified as Genthelvite by Dr. Eugene Ford.

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