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I found this in Topanga Canyon, California (LOS ANGELES). It can be scratched with a penny, but not my fingernail: hardness is about a 2.75 I guess. The size of a baseball.

I found this on the edge of a field on a mountain ranch within the Santa Monica Mountains. We are 5 miles north of the Pacific Ocean.

Thank you JulPal! I’ve been looking at concretion pics for months... just never saw anything similar. Yes, this item is round, but I’m puzzled by the white fibrous outer ‘shell’ as well as the embryonic interior and crystallized center.

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    $\begingroup$ Looks like typical concretions... Try googling for 'California concretion' and look at images $\endgroup$ – JulPal Aug 18 '18 at 8:26
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Its a concretion, the "fibers" are just crystallization of the material or crystal fill in minor cracks. The image below is a pyrite concretion with pyrite forming the radiating crystals.

enter image description here

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Another chance to get these 'fibers' are septarian concretions... See here for example

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