Commodity Code

chalcedony

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

definition Chalcedony is a cryptocrystalline form of silica, composed of very fine intergrowths of the minerals quartz and moganite. more like this
narrower agate
broader chalcedony
carnelian
broader chalcedony
chrysoprase
broader chalcedony
notation
01.03.29.01 more like this
Chlce more like this
source http://en.wikipedia.org/wiki/Chalcedony more like this
type
Resource
Concept
broader silica gemstone
narrower chalcedony
in scheme commodity code
is primary topic of chalcedony