[Garnet-Bearing]
NORTH CAROLINA
[Garnet- and Kyanite-Bearing]
NORTH CAROLINA
[Lit-Par-Lit]
NORTH CAROLINA
Gneiss is a common and widely distributed type of rock formed by high-grade regional metamorphism of pre-existing formations that were originally comprised of either igneous, sedimentary, or metamorphic rocks. Gneissic rocks are usually medium to coarse grained, foliated, and largely recrystallized but do not carry large quantities of micas, chlorite or other platy minerals. Gneisses whose protoliths were igneous rocks or their equivalent are termed granite gneisses, diorite gneisses, and the like. However, depending on their composition, they may also be called garnet gneiss, biotite gneiss, albite gneiss, based upon composition only and not upon the original protolith class. The term orthogneiss is applied to a gneiss derived from an igneous rock, and the term paragneiss is one from a sedimentary rock. Gneissose is a used to describe rocks with textural properties similar to gneiss. Gneiss resembles schist, except that the minerals are arranged into bands and there is a paucity of platy minerals such as mica. It is often difficult to tell the difference between gneiss and a schist as they are often found in close association, with a gradational contact relationship.
Morton Gneiss
Archean
[3.6 bybp]
MINNESOTA
Photographed by Michael P. Klimetz
Sericite Paragneiss
ARIZONA
Photographed by Michael P. Klimetz
Paragneiss
MONTANA
Photographed by Michael P. Klimetz
Augen Gneiss
NORTH CAROLINA
Photographed by Michael P. Klimetz
Deformed Orthogneiss
Berninapass
Kanton Graubuenden
SWITZERLAND
Photographed by Michael P. Klimetz
[Archean - 2.8 Bybp]
Wood County
WISCONSIN
Photographed by Michael P. Klimetz
[Archean - 2.8 Bybp]
Wood County
WISCONSIN
Photographed by Michael P. Klimetz
Portage County
WISCONSIN
Photographed by Michael P. Klimetz
[Archean - 2.8 Bybp]
Wood County
WISCONSIN
Photographed by Michael P. Klimetz
Canaria Valley
Tessin
SWITZERLAND
Photographed by Michael P. Klimetz
Proterozoic Y
Albany Post Road
Garrison
Putnam County
NEW YORK
Photographed by Michael P. Klimetz
Proterozoic Y
[With Slickenlines]
Albany Post Road
Garrison
Putnam County
NEW YORK
Photographed by Michael P. Klimetz
Proterozoic Y
[With Incipient Augen]
Albany Post Road
Garrison
Putnam County
NEW YORK
Photographed by Michael P. Klimetz
Proterozoic Y
[With Incipient Augen]
Albany Post Road
Garrison
Putnam County
NEW YORK
Photographed by Michael P. Klimetz
Lewisian Gneiss
[Deformed Granite-Gneiss]
Archean-Lower Proterozoic
Loch Eriboll
Northwest Highlands
SCOTLAND
Photographed by Michael P. Klimetz
Lewisian Gneiss
[Deformed Granite-Gneiss]
Archean-Lower Proterozoic
Loch Eriboll
Northwest Highlands
SCOTLAND
Photographed by Michael P. Klimetz
Lewisian Gneiss
[Deformed Granite-Gneiss]
Archean-Lower Proterozoic
Loch Eriboll
Northwest Highlands
SCOTLAND
Photographed by Michael P. Klimetz
Lewisian Gneiss
[Deformed Granite-Gneiss]
Archean-Lower Proterozoic
Loch Eriboll
Northwest Highlands
SCOTLAND
Photographed by Michael P. Klimetz
Lewisian Gneiss
[Deformed Granite-Gneiss]
Archean-Lower Proterozoic
Loch Eriboll
Northwest Highlands
SCOTLAND
Photographed by Michael P. Klimetz
Lewisian Gneiss
[Deformed Granite-Gneiss]
Archean-Lower Proterozoic
Loch Eriboll
Northwest Highlands
SCOTLAND
Photographed by Michael P. Klimetz
Orthoclase-Quartz-Hornblende-Biotite Gneiss
Proterozoic Y
Ramapo Fault Zone
Hudson Highlands
Albany Post Road
Garrison
Putnam County
NEW YORK
Photographed by Michael P. Klimetz
Orthoclase-Quartz-Hornblende-Biotite Gneiss
Proterozoic Y
Ramapo Fault Zone
Hudson Highlands
Albany Post Road
Garrison
Putnam County
NEW YORK
Photographed by Michael P. Klimetz
Orthoclase-Quartz-Hornblende-Biotite Gneiss
Proterozoic Y
Ramapo Fault Zone
Hudson Highlands
Albany Post Road
Garrison
Putnam County
NEW YORK
Photographed by Michael P. Klimetz
Orthoclase-Quartz-Hornblende-Biotite Gneiss
Proterozoic Y
Ramapo Fault Zone
Hudson Highlands
Albany Post Road
Garrison
Putnam County
NEW YORK
Photographed by Michael P. Klimetz
Lenticular Orthoclase-Quartz-Hornblende-Biotite Gneiss
Proterozoic
Waterbury Gneiss
Waterbury
New Haven County
CONNECTICUT
Photographed by Michael P. Klimetz
Lenticular Orthoclase-Quartz-Hornblende-Biotite Gneiss
Proterozoic
Waterbury Gneiss
Waterbury
New Haven County
CONNECTICUT
Photographed by Michael P. Klimetz
Alaskite [Leuco-] Gneiss
Proterozoic
Hope Valley Alaskite
I-90 at the Upton Town Line
Worcester County
MASSACHUSETTS
Photographed by Michael P. Klimetz
Quartz-Feldspar Gneiss and Amphibolite Gneiss
Mesoproterozoic
Barnes Mine
Harriman State Park
Rockland County
NEW YORK
Photographed by Michael P. Klimetz
Granite-Gneiss with Disseminated Magnetite
Mesoproterozoic
Scrub Oaks Mine
Iron Hill Industrial Park
Mine Hill
Sussex County
NEW JERSEY
Photographed by Michael P. Klimetz
Granite-Gneiss with Disseminated Magnetite
Mesoproterozoic
Scrub Oaks Mine
Iron Hill Industrial Park
Mine Hill
Sussex County
NEW JERSEY
Photographed by Michael P. Klimetz
Granite-Gneiss with Disseminated Magnetite
Mesoproterozoic
Scrub Oaks Mine
Iron Hill Industrial Park
Mine Hill
Sussex County
NEW JERSEY
