Hi Russ:

It looks better now. 

Apparently one of the dealers in Butte sent out many rhodochrosite samples with the "Leonard Mine" locality, (I purchased one myself) and it was only later that the locality was changed to reflect the formation temperatures in the Butte District.

Just for fun information, I actually went to Butte to collect and the place, back in the 70's was quite open to roaming around.  There was rock from the various mines scattered on the ground everywhere, including rhodochrosite.   The hard part was to figure out just which mine the material came from and mindat helped me figure that out.   My main collecting seemed to have been in the huge open field by one of the processing plants where ores from all the various mines were brought.

Hi Rolf:

We stayed in Butte for a couple of days back in 1988 to visit the museum there and see the old mines. It was a memorable trip. The chap at the hotel in downtown Butte recommended going to one of the supper clubs that formerly fed the miners when they came off shift. They certainly ate well! Did you try the pork chop sandwiches when you were there?

I can sympathize with someone trying to sort out a mixed pile of rocks for samples. Thankfully Butte has had a number of excellent reports that allows sorting out of the minerals from the mines based on the temperature of formation. The Rhodochrosite formed only in the lower temperature at the periphery of the district, such as the Emma Mine. The Stewart and Leonard Mine had very little carbonate and what it did have formed late-stage colorless Calcite rhombs.