<p>These Basalt rocks were hand cracked and used to build the walls on my home.</p>
<p>Many of these rocks have these semi circular pattern, made of the basalt itself. It's just a bit darker than the rest of the stone.
I am wondering what caused it. <a href="https://i.sstatic.net/k1mgm.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/k1mgm.jpg" alt="Pattern on Basalt rock" /></a></p>

CC BY-SA 4.0
2022-03-11T17:10:02.357Z
Conchoidal fracture
Siv
CC BY-SA 4.0
2022-03-11T19:22:58.827Z
likely a result of the tools used during the manufacturing process,a hydraulic hammer or a result from explosives used to fracture the rock.one can see two points of impact so probably from a hammer.
trond hansen
<geology><rocks>
Patterns on Basalt
Delson Roche
# Patterns on Basalt

(Asked by: username_0 on 2022-03-11)

These Basalt rocks were hand cracked and used to build the walls on my home.

Many of these rocks have these semi circular pattern, made of the basalt itself. It's just a bit darker than the rest of the stone.
I am wondering what caused it. [![Pattern on Basalt rock](https://i.sstatic.net/k1mgm.jpg)](https://i.sstatic.net/k1mgm.jpg)

**Tags:** geology, rocks

> **Comments:**
> **username_1**: Conchoidal fracture  
> **username_2**: likely a result of the tools used during the manufacturing process,a hydraulic hammer or a result from explosives used to fracture the rock.one can see two points of impact so probably from a hammer.  

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## 0 answers

