Natural chalcedony Pendant

This beautiful landscape natural chalcedony pendant set in iron frame which will not tarnish.  Measures  19 x 36 mm.  

Chalcedony is a microcrystalline or cryptocrystalline form of quartz. It is made up of microscopic quartz crystals that are so small they can only be seen under a microscope. Chalcedony is semitransparent to opaque and can be colorless, white, gray, blue, or any color due to embedded minerals.