I'm thinking it's obsidian.
The rock you are describing is likely obsidian. Obsidian is a naturally occurring volcanic glass formed during rapid cooling of lava. It is usually black in color and has a smooth, glassy texture.
The description provided corresponds with sandstone, a type of sedimentary rock commonly found in deserts and beaches. Sandstone typically has a smooth texture, with tan and dirty white colors resulting from the combination of sand grains and minerals within the rock.
Slate rock has a fine-grained texture, with individual mineral grains that are too small to be seen with the naked eye. This gives slate a smooth and dense appearance.
Metamorphic rock can vary in texture, with some being rough due to the presence of mineral grains and others being smooth due to recrystallization of minerals during the metamorphic process. The texture of metamorphic rock depends on factors such as the original rock type and the intensity of heat and pressure.
Obsidian is an extrusive rock that is a naturally occurring volcanic glass. It occurs when lava extrudes from a quickly cooling volcano, causing little crystal growth.
Shale
Obsidian
bumpy and smooth
Slate is the type of rock that splits apart in layers, usually gray or black in color. It is commonly used to make blackboards due to its smooth texture that allows for writing with chalk.
The rock is the type of music with electric guiters, drums, and singing. The other rock is just smooth and bumpy
The rock you are describing is likely obsidian. Obsidian is a naturally occurring volcanic glass formed during rapid cooling of lava. It is usually black in color and has a smooth, glassy texture.
A conglomerate.
A rock that is heavy and silky could potentially be anthracite, which is a type of coal known for its high density and smooth, shiny appearance. Another possibility could be serpentine, a metamorphic rock that can have a slick, smooth surface due to its high content of the mineral serpentine.
Oil shale rock
it is limestone
It is abrasion
The description provided corresponds with sandstone, a type of sedimentary rock commonly found in deserts and beaches. Sandstone typically has a smooth texture, with tan and dirty white colors resulting from the combination of sand grains and minerals within the rock.