rocks pumice, rocks obsidian, rocks perlite, rocks porphyritic.
gandheng tuff, tuff rhyolitic, basaltic tuff, trachyte tuff lan tuff andesitic.
ngandhut asam ing alam, kasedhiya ing persil saka werna
tansah ditemokake minangka pipo vulkanik liwat lemah ndhuwur Continental jero