5
$\begingroup$

I found this rock in our backyard in Germany. As our garden is filled with bushes it was very oddly placed and I have carried this rock around with me ever since, wondering what sort of rock it might be.

It is quite heavy, neutral in smell and does not seem to be brittle. The surface is very rough and contains sharp edges as well as holes. Its colors vary from a dark grey to a brownish color and it reflects light/ shimmers in some places.
There are several spots on the rock that are golden and one particular place where the gold has a red undertone (sort of like copper).

It seems to have a magnetic field, yet only a very weak one.
The rock measures 9 cm in lenght and weighs around 578g

If you have any clue on what rock this might be I would very much appreciate it!

9cm in lenght and weighs around 578g

enter image description here

enter image description here

detail

detail

enter image description here

enter image description here

enter image description here

$\endgroup$
2
$\begingroup$

Try to look with a magnifying glass or a hand lens. Do the golden things look like cubes? If yes, then this is most probably pyrite. This is most probably pyrite even if those are not cubes.

The colour of some of these looks a bit like chalcopyrite, which is iron-copper ore. Try to smell the rock. Can you sense any sulfur? If yes, then it is probably chalcopyrite, which is less stable in air than pyrite so it emits a weak sulfurous smell.

$\endgroup$

Not the answer you're looking for? Browse other questions tagged or ask your own question.