Central Arkansas Harder than Quartz, Greasy What is it?

[3rdGn]

 

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[UncleVinnys]

Looks like quartz to me, but I'm not an expert.
Wondering if there is amber there too, but that is soft, aye?

I was gonna say my standard joke, but that is too cruel, even for me.

I.e., "Looks like a coprolite: fossilized dinosaur droppings, but not sure about the dinosaur part,
OR the fossilized part for that matter."

 

[RW]

Salt can sweat and feel greasy. How's it taste?

 

[Kray Gelder]

At a glance, calcite or quartz. But then you said it's harder than quartz. I don't think so. You should re-check that. Being from Arkansas, a diamond state, and describing greasy, a diagnostic test for diamond, are you thinking it's diamond? It's related to the rare Herkimer Diamond. Good luck to you.

 

[3rdGn]

Thanks for the encouragement

I don't know what it is?
My grandpa use to help me identify my finds this and another unknown (coprolite possibly ) we were working on identifying when he died in July. I thought I should continue what we started.
Grandpa thought it was possibly a diamond,
because it was greasy,
the multiple hardness test results,
no conchoidal fractures,
the four sided cleavage
the multiple positive diamond responses when a tester was used on a flat area of the specimen.
Grandpa and his mother had found yellow and brown diamonds in the same area. Great-grandma in early 1900’s found a 10 Ct yellow diamond (her dad had cut in NYC) in the same area
Thanks for your comments