fault fissure

The fault fissures filled these fissures with "mineral-bearing quartz".

These contain crystalline minerals, deposited in steeply sloping or vertical fault fissures between two walls of rock.

Volcanic vents to the east covered the area during the Tertiary, and a fault fissure opened the east slope of the Virginia Range.

Do you realize that Los Angeles stands zero chance of surviving as the Elysian Park Fault fissures up the whole city, dropping entire blocks miles down into the ground, never to be seen again?

The South Minera Vein, a fault fissure rilled with mineral matter, ran through the area of Esclusham Mountain and, until the second decade of the 20th century, there were many lead mines in the area, some of whose levels joined with the substantial system of natural caves beneath the mountain.