Cord Ligament
Fabric
A rippled surface resembling ropes or braids.
The ripples are smooth and flowing, indicating a slow, steady flow of magma.
Color
Gray to dark gray, sometimes black
Mineral Composition
Mostly basaltic in origin, rich in: plagioclase, pyroxene
Formation Method
It is formed as a result of low-viscosity pulp slowly flowing over the surface. As the outer surface cools, the inner pulp continues to flow, causing the surface to wrinkle and form ropes.
Tectonic Environment
Usually occurs in quiet or flowing eruptions such as basaltic volcanoes.
Geographical location
Arabian Shield Rocks, Saudi Arabia, Harrat Rahat
