Breccia is distinguished from conglomerate by its angular clasts.
|Particle size (Wentworth)||>2 mm|
Breccia in Hand Sample
Volcaniclastic breccia from Mount St. Helens
Volcaniclastic breccia from the Gallatin Range, Montana
Fault breccia from the Hebgen Lake Fault
Landslide breccia from the Crazy Cat landslide in El Paso, Texas
Brecciated quartzite from the Cambrian-aged Antietam Formation
Breccia in basalt
Serpentinite breccia from the North Anatolian Fault
Breccia in Thin Section
Lunar sample 65015 is impact breccia collected from the moon by the Apollo 16 astronauts! It was imaged by, and is used with the permission of, Paul Karabinos. NASA offers a brief but full and useful description here. The Lunar and Planetary Institute hosts dozens of photos, including the hand sample from which it was cut, chipping diagrams, and photos documenting every cut of the sample.
Volcanic breccia in plane polarized light.Magnification: 40xClick here for crossed polars: https://youtu.be/xIsqSRvsJnwClick here to explore this slide in pl…
Volcanic breccia in cross polarized light.Magnification: 40xClick here for plane polars:Click here to explore this slide in plane polars:https://viewer.gigam…
Marble breccia in plane polarized light.Magnification: 40xClick here for crossed polars: https://youtu.be/urh9GU95Ya8Click here to explore this slide in plan…
Marble breccia in cross polarized light.Magnification: 40xClick here for plane polars: https://youtu.be/Fh79XjMp26gClick here to explore marble breccia in ha…