P3H4O1N1O1L1I1T1E1
14 points
PHONOLITE is validvalid
a fine-grained intermediate igneous rock that rings when struck by a hammer, aka clinkstone
a fine-grained intermediate igneous rock that rings when struck by a hammer, aka clinkstone
a fine-grained intermediate igneous rock that rings when struck by a hammer, aka clinkstone
a fine-grained intermediate igneous rock that rings when struck by a hammer, aka clinkstone