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I've got a smooth, small, brown rock with a tiny bit of cleavage and a little bit of fracture. I can't identify it.
Can you post a picture?
Where did you find it? Any way of testing its hardness?
I found it in a road cut and its hardness is between 5 and 6.
I would have thought its some sort of microcrystalline quartz but the hardness disproves that. Its going to be difficult to analyze without more complex tests...
Is there any blood red spots in it?
No. It's all dark brown.