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What kind of rock/mineral/object is this?

0 votes

Re-uploaded with new pictures where you can actually make out the colour

On all sides except for one it is a dark green-ish colour. The other side is kind of brown red-ish. All sides are completely smooth and I can hardly damage it with a knife. It looks as if it was damaged before tho on some parts (scratches on the surface, conchoidal dents where something appeared to have broken off). It's completely non-transparant an the colour is some kind of mat, dull green with a bit of a shine to it.

I tried to break it with a hammer but that hardly did any damage. Only one little chip broke off and left a conchoidal dent. on the bottom there a some white spots now because it was sitting on an non-smooth surface when I hit it.

My gf's cousin says it could be glass but I am not entirely sure since i cant break/destroy it. It's a bit heavier than expected

Close up of that brown/grey/black part. Some of it is dirt that i cant get off no matter what. The black part was set free when I hit it with the hammer and something broke off

asked Nov 11, 2015 by Akeela_ (120 points)

2 Answers

0 votes

Green Chalcedony sometimes called Chrome Chalcedony comes to mind. From Zimbabwe. Did you find it, or purchase it? Conchoidal fractures are indicative of a very hard stone. Where the stone comes from is key to identifying it. My first guess is chalcedony.

The host rock, or matrix is the reddish brown  rock. The bluefish crystal is interesting. The green coloring for chalcedony is from chromium.

answered Nov 11, 2015 by Weasel (33,890 points)
Found it in germany. It was buried a few centimeters in the ground.
whats confusing me the nost is that it is naturally smooth, unlike all the stones it could be
0 votes
May also e post-mining slag.
answered Nov 24, 2015 by hershel (46,460 points)

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