Sillimanite-garnet-biotite-quartz-plagioclase gneiss

Sillimanite-garnet-biotite-quartz-plagioclase gneiss

AD-4

The predominant lithology of the Peck Lake Formation is a sillimanite-garnet-biotite-quartz-oligoclase gneiss with pods and lenses consisting of two feldspars and quartz (anatectic?). The lithology is widespread throughout the Adirondacks and may represent a metapelite or metagraywacke. European geologists have referred to similiar lithologies as "kinzigites" (deWaard, 1962).
Thin section shows sillimanite, quartz, biotite and plagioclase.

1980

Western Minerals Inc.

Adirondack Highlands--collected form a road cut on Route 29A approximately 5 miles north of Canada Lake Store, directly across from the Canada Lake Rod and Gun Club entrance.

Precambrian

Purchased from Western Minerals Inc.

Peck Lake Formation

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