Dendritic agate. Like some mysterious Carboniferous ferns, a pattern of metal oxide, probably mangan
Dendritic agate. Like some mysterious Carboniferous ferns, a pattern of metal oxide, probably manganese, has infiltrated into this cream coloured agate, either during or shortly after formation when the silica was still in a gel form. Such plant or landscape patterns are highly sought after by collectors, and usually are full of rich detail when examined under a hand lens. Loz Image credit: Chip Clarke -- source link
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