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Hi! My name is Thomas, I am a senior student in Canada. I found this rock as a kid in Korea in a high mountain area. I was always wondering what this thing was. Its very heavy, and also very hard. A knife wouldn't even make a mark on it. The green crystal looking area on the second picture is very smooth, While the first picture still has a greenish color but rough. As you can see on the third picture it is slightly transparent. Size is about 20 centimeters, ruler looks off due to perspective. If needed I'll try to break it with hammer, but I dont want to risk it at the moment.

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  • $\begingroup$ please take a picture of the rock outside but out of direct sunlight(on a cloudy day or in the shade)this is to see the rock in natural light.a better location and more details is helpfull too so please take a look here earthscience.meta.stackexchange.com/questions/124/… $\endgroup$ – trond hansen Feb 28 at 6:05
  • $\begingroup$ Sure, as it is midnight over here, I will edit in a new picture tomorrow $\endgroup$ – Arandomstudent21 Feb 28 at 6:30
  • $\begingroup$ Can you check moho's scale. It looks beryl as shown in this piece but a bit mor dirty. Hardness for beryl is 7.5 earthscience.stackexchange.com/questions/14197/… $\endgroup$ – Universal_learner Feb 28 at 10:16
  • $\begingroup$ Also can you provide a precise location? there is beryl at South Korea, but to confirm it we would need where are those mountains exactly placed. $\endgroup$ – Universal_learner Feb 28 at 10:18
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The physical appearance of your rock texture, color, luster, and fracture suggests that it is likely to be nephrite jade. A nephrite deposit can be found in Chuncheon City, South Korea. Oksanga jade mine is reported to be still an active source for white nephrite jade. Other jade occurrences most likely exist in South Korea and dark olive green is a common color for nephrite.

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