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The classic explanation has long been that quartz slowly replaces fibrous crocidolite asbestos
The druzy geode agate beads
Have it engraved for use as a personal hanko
It is the kind of piece that rewards a slow
silica rich fluid worked its way in
Goniatite Fossil 150mm — Morocco, Devonian Index Fossil faden pecimen The classic explanation has longA goniatite fossil from Morocco, 150mm and 544g, the coiled shell of an extinct marine cephalopod preserved in stone for roughly 390 million years since the Devonian period. Why are goniatites specifically valuable to geologists, beyond their appeal as fossils? They are what's known as index fossils, species that evolved quickly and spread widely enough that their presence in a rock layer tells scientists roughly when that layer formed. Goniatites are
