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Thanks for the comments ian_m. Can anyone comment on the possible effect of the other components in the serpentine?

When you see it under a microscope you can understand why you wouldn't want it in your lungs!

Thanks for the feedback, I'm looking to also understand the science behind why it would be dangerous. By what mechanism would it be dangerous in rock form submersed in water? I understand that when rocks are smashed into dust and inhaled asbestos should be avoided. When it is still trapped in...

I have picked up some beautiful rocks for use (hopefully) in my aquarium but am looking for advice to if they are suitable with regards to the water chemistry. The rocks are lizardite variety serpentine that I picked up from the Lizard peninsula here in Cornwall. More in depth information can be...