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Denzillinger
IMG_0389.jpg  Hi, I found this on my lobby floor 21 years ago. Upon waking I found this, it had come through my front door window, most probably from someone who was disgruntled with me. I have had this so long I  think it is about time I have it identified. It is attracted by a magnet, quite heavy but I doubt it is a meteorite I thought it might be some kind of mineralized fossil any ideas?
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Dirty Pete
Hi,
Looks like a naturally polished shelly limestone. Broken shells in a lime mud matrix with calcite veins. I have no idea why it would attract a magnet unless it's full of magnetite or maybe has an iron bar up the middle.

Pete
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prep01
Pete, I and Mike Hardman have already answered this enquiry in the new Facebook page (https://www.facebook.com/groups/NHMUKBiodiversity/ it has a Siderite covering in places.
Colin Huller
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Denzillinger
Thanks! everyone I could post more images if you think it would help. 
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Dirty Pete
Without taking it down the lab and doing some serious petrological analysis I think bioclastic limestone is about as good as you'll get. I thought siderite only developed weak magnetic properties after applying a blow torch.....

Pete
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