igneous
Basalt with Red Sandstone
Mafic extrusive igneous rock with quartzose sedimentary matrix
AI-generated identification · may be incorrectHardness ranges from 5 to 7 on the Mohs scale depending on the mineral component. Displays contrasting colors of dark greenish-gray basalt and reddish-brown sandstone, with an aphanitic to granular texture.
Identified More igneous →
Explore Basalt with Red Sandstone in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness ranges from 5 to 7 on the Mohs scale depending on the mineral component. Displays contrasting colors of dark greenish-gray basalt and reddish-brown sandstone, with an aphanitic to granular texture.
Formation & geological history
Formed through volcanic cooling of mafic lava flows interacting with accumulated desert or fluvial sand deposits over millions of years.
Uses & applications
Primarily used as a geological sample for education, landscaping, and aggregate construction materials.
Geological facts
Composite rock fragments like this often form in regions of active tectonics where volcanic activity overlaps with sedimentary basins.
Field identification & locations
Identify by the distinct color contrast between the fine-grained dark volcanic rock and the reddish sedimentary layers. Common in riverbeds and glacial drift.
