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BTW...the facies that I found this sample in was faulted (normal fault...at least 10 meters of throw) One side of the fault (hanging wall) had almost no hematite, and the other side was chock full of it. If I remember correctly, the formation was once an alluvial fan. Would the mismatched presence of hematite be caused by the precipitation of iron from the feldspar at the top of the fan to the base of the fan before the formation was faulted?
Hmmmm... .... from the dry environment in Austin to the wet (understatement) environment in Houston, and lo and behold, the hematite oxidized further and fell off of the outer surface.
Hematite most likely from weathering of iron-bearing minerals (not feldspar). Is the hematite restricted to the fault zone, or is it found throughout the footwall?
(I suspect it is because that is where the job was. It is the reason I moved there. But after 12 years of Houston in the 70's & 80's I cam back to Austin. I am now much happier. and still able to survive as a geologer.
THIS IS THE ANSWER ! You left Paradise for Hell. You now live in the Devil's sauna. WHY WHY WHY Oh, you poor lost soul!