|
|
| Basalt is a fine-grained, extrusive igneous
rock with the same minerals as its intrusive
equivalent, gabbro. Basalt is either aphanitic
and black, or greyish Black. Many basalts contain
phenocrysts. This rock type is called a porphyritic
basalt. |
|
|
|
|
|
Stepping,
Sill Stone .... |
More
>>>> |
|
|
|
|
|