What is this spherical, metallic rock?

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Offline almanza86

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What is this spherical, metallic rock?
« on: 07/10/2016 03:13:55 »
Found a spherical rock in Central Mexico that once broken turned out to be silver looking interior with a smell of sulfur, Any ideas as to what it is?
« Last Edit: 07/10/2016 09:04:16 by chris »

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Offline RD

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Re: What is this spherical, metallic rock?
« Reply #1 on: 07/10/2016 12:19:49 »

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Offline distimpson

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Re: What is this spherical, metallic rock?
« Reply #2 on: 10/10/2016 15:06:34 »
maybe a pyrite nodule aka fools gold. FeS2, density about 5g/cc "feels heavy" for it's size, not much attraction to a magnet, black streak on porcelain. pyrite crystals are pretty yellow but I've seen some nodules with just a slight yellow color.

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Offline Bass

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Re: What is this spherical, metallic rock?
« Reply #3 on: 14/10/2016 18:36:31 »
I agree, probably pyrite concretion.
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