Editing Garnet (section)

===Largest garnet crystal===
The open-pit Barton Garnet Mine, located at [[Gore Mountain (New York)|Gore Mountain]] in the [[Adirondack Mountains]], yields the world's largest single crystals of garnet; diameters range from 5 to 35&nbsp;cm and commonly average 10–18&nbsp;cm.<ref name="Geophere">{{cite journal | title= Megacrystic Gore Mountain–type garnets in the Adirondack Highlands: Age, origin, and tectonic implications | year= 2011 | publisher=Geological Society of America| doi= 10.1130/GES00683.1 | last1= McLelland | first1= James M. | last2= Selleck | first2= Bruce W. | journal= Geosphere | volume= 7 | issue= 5 | pages= 1194–1208 | bibcode= 2011Geosp...7.1194M | doi-access= free }}</ref>

[[Gore Mountain Garnet|Gore Mountain garnet]]s are unique in many respects, and considerable effort has been made to determine the timing of garnet growth. The first dating was that of Basu et al. (1989), who used plagioclase-hornblende-garnet to produce a Sm/Nd isochron that yielded an age of 1059 ± 19 Ma. Mezger et al. (1992) conducted their own Sm/Nd investigation using hornblende and the drilled core of a 50&nbsp;cm garnet to produce an isochron age of 1051 ± 4 Ma. Connelly (2006) utilized seven different fractions of a Gore Mountain garnet to obtain a Lu-Hf isochron age of 1046.6 ± 6 Ma. It is therefore concluded with confidence that the garnets formed at 1049 ± 5 Ma, the average of the three determinations. This is also the local age of peak metamorphism in the 1090–1040 Ma Ottawan phase of the [[Grenville orogeny|Grenvillian orogeny]] and serves as a critical data point in ascertaining the evolution of the megacrystic garnet deposits.<ref name="Geophere"/>