Commodity Code

pumice

http://resource.geosciml.org/classifier/cgi/commodity-code/pumice

definition A volcanic rock that consists of highly vesicular rough textured volcanic glass, which may or may not contain crystals. It is typically light colored. Scoria is another vesicular volcanic rock that differs from pumice in having larger vesicles and thicker vesicle walls and being dark colored and denser. more like this
notation
01.01.04.07 more like this
Pumi more like this
source http://en.wikipedia.org/wiki/Pumice more like this
type
Resource
Concept
broader industrial rock
narrower pumice
in scheme commodity code
is primary topic of pumice