The most common material that chalkboards are made out of is porcelain enamel. More information about chalkboards can be found at http://www.answers.com/topic/chalkboard
a rock is made up of different kinds of minerals.
A rock may contain hundreds to thousands of different minerals varying the size of the rock. Most people just say rock to not be specific or just to save time. Only a geologist really pays much attention to what a rock is really called while others just say rock because they don't know what a stone is. A rock can be anything, some people call metals like tin or zinc when there in ore form a rock. Also gold, silver, and platinum in there host rock are called rocks.
Mineral or combinations of minerals.
A mixture of minerals and other materials
The type or rock made from tree sap is amber or jantar.
igneous rock
Slate is the type of rock to make blackboards.
Sedimentary rock.
Sandstone is a sedimentary rock and it is made of smaller pieces of rock and is pressed together
the type of rock made mostly from clay is the shale rock
Magma IS made of melted rock and minerals. Not what type of rock. All types of rock.
it is made up of the type of rock that is called the ciarra rock its mostly made in purto rico and france
The type or rock made from tree sap is amber or jantar.
Granite
A rock star?
igneous rock
Slate is the type of rock to make blackboards.
Sedimentary Rock.
igneous rock
Sedimentary rock.
Is it Hard rock or Soft rock