<p>That is a very cool rock. However, mineralogically, it is probably not all that interesting. It is likely a sedimentary nodule that formed from concreted sand and organics. The strange shape is likely the result of differential weathering, where one half of the nodule was exposed, while the other side was protected due to burial.</p>

CC BY-SA 4.0
2018-10-18T01:36:51.427Z
2018-10-18T01:36:51.427Z
Arkenstein XII
<p>This is a so called Moqui Marble. A spherical concretion formed by sand and iron based minerals like limonite. </p>

<p><a href="https://de.m.wikipedia.org/wiki/Moqui-Marble" rel="nofollow noreferrer">Further information can be found here</a> </p>

CC BY-SA 4.0
2018-10-18T06:17:35.260Z
2018-10-18T06:17:35.260Z
JulPal
<p>These are recent pictures of it. It’s heavy, I see small minerals that catch the light in it, very bumpy, spherical, doesn’t seem to be magnetic, I was falling down a deep trench and kicked it up at the bottom. Area was sand, sage, and small cacti. (<a href="https://i.sstatic.net/p2Bbz.jpg" rel="nofollow noreferrer">https://i.sstatic.net/p2Bbz.jpg</a>)<img src="https://i.sstatic.net/UF3HY.jpg" alt="enter image description here"><img src="https://i.sstatic.net/4h4eE.jpg" alt="enter image description here"><img src="https://i.sstatic.net/w6yNc.jpg" alt="enter image description here"></p>

<geology><rocks><mineralogy><minerals>
I found this strange spherical stone in Gillette Wyoming. I have no idea what it is. Please help.
Sidney
# I found this strange spherical stone in Gillette Wyoming. I have no idea what it is. Please help.

(Asked by: username_0 on 2018-10-18)

These are recent pictures of it. It’s heavy, I see small minerals that catch the light in it, very bumpy, spherical, doesn’t seem to be magnetic, I was falling down a deep trench and kicked it up at the bottom. Area was sand, sage, and small cacti. (<https://i.sstatic.net/p2Bbz.jpg>)![enter image description here](https://i.sstatic.net/UF3HY.jpg)![enter image description here](https://i.sstatic.net/4h4eE.jpg)![enter image description here](https://i.sstatic.net/w6yNc.jpg)

**Tags:** geology, rocks, mineralogy, minerals


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## 2 answers

### Answer by username_2 on 2018-10-18. Score: 4 | Accepted answer

This is a so called Moqui Marble. A spherical concretion formed by sand and iron based minerals like limonite.

[Further information can be found here](https://de.m.wikipedia.org/wiki/Moqui-Marble)


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### Answer by username_1 on 2018-10-18. Score: 2

That is a very cool rock. However, mineralogically, it is probably not all that interesting. It is likely a sedimentary nodule that formed from concreted sand and organics. The strange shape is likely the result of differential weathering, where one half of the nodule was exposed, while the other side was protected due to burial.


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