I have an interesting thought on the composition of this new find so I thought I would share the latest email thread I have going and some photos that capture what I am "chatting" about.
It is an email thread so it will make more sense starting at the bottom.
Sent: Sunday, May 19, 2013 10:19 AM
To: Michael Hoover
Subject: RE: Harquahalla Shattuckite
I see what you are talking about. I have
noticed the red spider webbing in this material
that runs through the black. Could there be enough of that
to make the mud its color. I don't want to totally discount
psilomelene but I have my doubts. Let me take this up with
someone who may have some ideas and I'll get back to you.
Indeed very interesting.
BTW an exquisite knife.
Rodney
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Subject: RE: Harquahalla Shattuckite
Date: Sun, 19 May 2013 08:58:29 -0700
Rodney,
It is not Hematite as it is too hard and not magnetic and the polish is too black. It even has the circles showing as I see in the outer crust areas of Psilomelane. When sanding it tends to grab and scuff like Psilomelane too. I have attached photos of how it polishes.
Sent: Sunday, May 19, 2013 8:33 AM
To: Michael Hoover
Subject: RE: Harquahalla Shattuckite
Michael,
Very interesting question. I have seen copper
minerals in some of the mangenese mines but not within the
same stone. The mud looks more like the result of hematite
rather than psilomelane. It could be pyrolusite in the mix but that
would not color your mud red or violet. I suspect iron before any of the others
but it would need to be analyzed by x-ray diffraction or AA (atomic absorption).
I am still working on a positive i d for the green. Will keep you posted.
Rodney
________________________________________
Subject: Harquahalla Shattuckite
Date: Sat, 18 May 2013 13:34:54 -0700
Rodney,
I am working the Harquahalla stone now and it is very interesting to work with. It is challenging but takes a great polish.
I am wondering if it is possible for Psilomelane to be found mixed in with the Copper minerals? The very black parts of the Harquahalla stone act like Psilomelane when sanding and polishing and the black is darker than what I have seen of psuedomorphed Chalcocite in the Vulture Mt stone. I have attached a photo of the mud from Harquahalla as compared to mud from a piece of Chrysocolla in Chalcocite from Planet Ranch Az.
Michael S Hoover