Small crystal-lined spheres of silica rock that sometimes occur in limestone are called geodes.
Geodes!
A rock consisting chiefly of calcium carbonate or carbonate of lime. It sometimes contains also magnesium carbonate, and is then called magnesian or dolomitic limestone. Crystalline limestone is called marble.
Recrystallized limestone is generally called marble. Recrystallized quartz sandstone is generally called quartzite. There is no such thing as quartz limestone.
The soft greyish limestone that crumbles easily is called chalk.
Pigment
Marble is the metamorphic rock formed from limestone. =)
Hollow spheres in a limestone rock could be called pockets or geodes.
A rock consisting chiefly of calcium carbonate or carbonate of lime. It sometimes contains also magnesium carbonate, and is then called magnesian or dolomitic limestone. Crystalline limestone is called marble.
Limestone caves are sometimes called solution caves because they are formed through a process called solution weathering. This occurs when water containing carbon dioxide dissolves the limestone rock, creating cave systems over time. The dissolved limestone is carried away in the form of a solution, hence the term "solution cave."
Congruent spheres
vertex
A vertical gap in limestone is called a grike. The remaining blocks of rock are called klints. The cracks in limestone are called joints.
Limestone is called limestone because it has lime in it from the sea water it if formed in.
A Pyramid is a shape called a pyramid, there are no spheres in a triangulare shape.
Recrystallized limestone is generally called marble. Recrystallized quartz sandstone is generally called quartzite. There is no such thing as quartz limestone.
They are not perfect spheres. If they were, they would have been called spherical, not elliptical!
True
Planets are approximately in shape, usually elongated spheres called spheroids (squashed spheres)