Outokumpu, (Mokkivaara mine), Finland


DESCRIPTION

Outokumpu means "the hill of the devil" or from another source "the strange hill".
The mine we visited is called Mokkivaara and I don't know if it's a separate mine or a part of the Outokumpu copper mine. The mine is situated just outside of Outokumpu and a small "trench" in the side of a big open cast mine is used for tourists and chromian diopside for jewellry.

GEOLOGY

.....

VISITS

1997-06-25
This was one of the best visits on the trip, and I will come back next summer for everything I missed this time. With a little more time and a little better organised search I think it would be possible to collect a couple of uvarovites in a day here.
The things to bring is a heavy sledge, a bucket and lots of water.
The owner of the mine was very helpful with identifying minerals and showing us where to search. I have been told afterwards that they had blasted in the mine just before we arrived for our sake, and it was very easy to find nice stuffs.
Mineral assemblage Chromian diopside, chromium tremolite, uvarovite, kammererite, cromite, pyrrhotite, pentlandite, gersdorffite, pyrite, chalcopyrite, sphalerite, zinkcromite, cromdravite???,fuchsite, cromepidote, asbesthos, anthophyllite.....

Uvarovite

When we left the harbor in Sweden I told one of the more experienced persons on the trip that the thing I mostly wanted from the trip was to find an uvarovite. He then told me not to have too great expectations to find it.
When we got to the small quarry it took me about five minutes to find this one, and I also found two more small uvarovites. The trip was a total success whatever would happened after this.
Collected 1997-06-25
(300 dpi, 800x600, k)
Uvarovite

On a dark night during the fall I was examining the uvarovite and I discovered that there was a crack in the calcite on the side of the uvarovite. I then decided against all common sense that I should try to split the rock at the crack.
When the rock split, my hart skipped some strokes, because what I had believed all time to be the greatest side of the uvarovite showed to be the short side of it. It suddenly growned three times in size.
I will not try my luck again, so this is the final look of my uvarovite.
Collected 1997-06-25
(300 dpi, 800x600, k)
Chromian tremolite

Chromian tremolite with calcite and pyrrhotine (on the back side).
Collected 1997-06-25
(300 dpi, 800x600, k)
Chromian diopside

Two terminated crystals of chromian diopside. The material between the crystals is calcite.
Collected 1997-06-25
(300 dpi, 800x600, k)
Chromian diopside

Another crystal of chromian diopside. This one is flanked by two pieces of some sulphide. This one is also nicely terminated.
Collected 1997-06-25
(300 dpi, 800x600, k)
Pyrrhotite

A nice hexagonal pyrrhotite crystal in a matrix of calcite and chromian diopside. The crystal is flat at top and bottom and is about 3 mm thick. It has a nearly perfect hexagonal shape.
Collected 1997-06-25
(300 dpi, 800x600, k)

If you have some questions, suggestions or comments you are welcome to write me a line or two.
Locality index. Main index.


axelsson@acc.umu.se