Unkown possible metallic in Chalcedony?

[RockAli]

Hi Everyone! Any insight would be appreciated. These appear to be chalcedony desert rose. But really not sure. I am confused by the silvery white to pale yellow metallic running all throughout. Does not appear to be pyrite or mica. They are quite heavy. Thanks in advance! Alison

 

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[Eu_citzen]

The chalcedony is botryoidal, it just isn't that well developed.