Commodity Code

onyx

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

definition Onyx is a black-and-white banded agate more like this
notation
01.03.29.01.01.02 more like this
Onyx more like this
source http://www.quartzpage.de/agate.html#onyx more like this
type
Resource
Concept
broader agate
narrower onyx
in scheme commodity code
is primary topic of onyx