Pretty please tell me what the heck these are!!

[619 mary]

I’ve been obsessed for a year! There’s a hillside of these crazy extremely heavy rocks in San Diego and full of brown crystals and some quartz crystals. The pic with the chunk taken out and brown inside is about the size of 2 basketballs and weighed about 180 lbs or more. The round one I took water and a toothbrush and the wierd thing on top was exposed and much harder material. What are these crazy rocks?!!

 

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