|ANDRADITE Gallery Return to Andradite page. Click on image for larger view|
Locality: Franconia Iron Mine, Sugar Hill, NH
Specimen Size: 4.5 cm specimen. Largest andradite crystal is 8 mm
Field Collected: Unknown. Purchased on e-Rocks auction from German dealer Roger Lang.
Catalog No.: 2051
Notes: Specimen is Ex. A. A. Demour - France. Original label photo included here. Keeping these old labels is very important. I would not have bid on this specimen without the convincing label.
The specimen has 1 to 2 mm tufts of fibrous actinolite similar to those on my self-collected specimens #1707 & 1708. See Actinolite gallery
[tm] The Franconia Iron Mine (dumps) are the only verified NH locality for andradite garnet.
A November 2017 polished grain EDS analysis (BC230) indicated a calcium-iron garnet. The ideal andradite chemistry is: Ca3Fe3+2(SiO4)3 . The chemistry from this analysis yields: Ca3Fe1.15Si3.5O22.3 , normalized for 3 Ca.