Leucogranitic gneiss (NYYlg;2)

Leucogranitic gneiss

Sodic plagioclase ranges from generally subordinate to locally dominant; locally with biotite, hornblende, pyroxene, garnet, sillimanite, disseminated magnetite; commonly contains metasedimentary layers, amphibolite, migmatite; plagioclase-rich variety is host to magnetite ore bodies in eastern Adirondacks.

State	New York
Name	Leucogranitic gneiss
Geologic age	Middle Proterozoic
Lithologic constituents	Major Metamorphic > GneissLeucogranitic gneiss Minor Metamorphic > Amphibolite Metamorphic > Migmatite Metamorphic > Metasedimentarymetasedimentary layers
References	Fisher, D.W., Isachsen, Y.W., and Rickard, L.V., 1970, Geologic Map of New York State, consisting of 5 sheets: Niagara, Finger Lakes, Hudson-Mohawk, Adirondack, and Lower Hudson, New York State Museum and Science Service, Map and Chart Series No. 15, scale 1:250,000.
NGMDB product	NGMDB product page for 98670
Counties	Hamilton - Saratoga - Warren - Washington

Leucogranitic gneiss

Fisher, D.W., Isachsen, Y.W., and Rickard, L.V., 1970, Geologic Map of New York State, consisting of 5 sheets: Niagara, Finger Lakes, Hudson-Mohawk, Adirondack, and Lower Hudson, New York State Museum and Science Service, Map and Chart Series No. 15, scale 1:250,000.