tuff breccia - display specimen of a spectacular tuff breccia with a variety of clast types embedded in the pinkish ash kaolinite Al2(Si2O5)(OH)4

kaolinite  Al2(Si2O5)(OH)4

is a topic still under discussion

a relatively uncommon carbonate

The field photos show textures of the tufa draped over limestone

The second photo compares the shortwave response of these specimens with others from the same cave system that fluoresce hot pink

tuff breccia - display specimen of a spectacular tuff breccia with a variety of clast types embedded in the pinkish ash kaolinite Al2(Si2O5)(OH)4This particular volcanic igneous rock is composed of volcanic ash and many fragments (clasts) of other igneous rocks that were ejected from a volcanic vent. Because the ash was very hot when it fell to earth, the ash and rock fragments were welded together. A breccia (from the Italian breccia for rubble) is normally composed of angular broken rock fragments that have been cemented together, such as where faulting has shattered rocks. In this case,