Rock group	Metamorphic
Metamorphism type	Regional
Metamorphic rock class	Psammitic
Protolith	Quartz sandstone
Common minerals	Quartz Hematite (cement) Calcite (cement)

Quartzite in Hand Sample

Sugarloaf Mountain quartzite
Tuscarora Formation quartzite with iron oxide staining
Ferruginous quartzite
Brecciated Antietam Formation quartzite: quartzite clasts cemented with iron and manganese oxides
Weverton Formation quartzite
Kyanite quartzite
Green quartzite

Quartzite in Thin Section

Quartzite, plane polars
Quartzite, crossed polars
Kyanite quartzite, plane polars
Kyanite quartzite, crossed polars
Ghost boundaries in quartzite, plane polars
Ghost boundaries in quartzite, crossed polars

Quartz in Quartzite, Plane Polars

Quartz in quartzite, cross polarized light.To view these grains in crossed polars, click here: https://youtu.be/k5roRzZ5Qd8To explore a gigapan of this slide…

Quartz in Quartzite, Crossed Polars

Quartz in quartzite, cross polarized light.To view these grains in plane polars, click here: https://youtu.be/Pfm9-GrcxZ8To explore a gigapan of this slide i…

Ghost boundaries in quartzite, plane polars

Ghost boundaries in quartzite in plane polarzied light.Magnification: 40x.Click here for crossed polars: https://youtu.be/FaST2cLCmNkClick here to explore th…

Ghost boundaries in quartzite, crossed polars

Ghost boundaries in quartzite in cross polarzied light.Magnification: 40x.Click here for plane polars: https://youtu.be/3MSVRj21kiEClick here to explore this…