propaedeuticist asked: maybe lunarfossils' specimen has some kinda of agate growth or hematite layer. I've seen both of those minerals coat another botryoidal mineral. Hematite has a thinner slicker sheen or a dusty texture. Agate has a shallow chalky translucency so in person it would be easier to tell if it's either of them.
Thanks for the answer :)
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