It was a sedimentary rock before it was metamorphosed. Any limestone, pure or impure, can recrystallize as a marble. read more
No. Marble is a metamorphic rock. It is a metamorphosed limestone - and limestone is a sedimentary rock, but marble has been ‘changed’ by heat and/or pressure, and has recrystallized to a different textural kind of calcium carbonate. Rocks which have been changed are called ‘metamorphic’ or metamorphosed, rocks. read more
marble; migmatite; phyllite; quartzite; serpentinite; slate; Sedimentary Rocks. Sedimentary rocks are called that because they were once sediment. Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently naturally transported (or not). read more
Marble is a metamorphic rock formed when limestone is exposed to high temperatures and pressures. Marble forms under such conditions because the calcite forming the limestone recrystallises forming a denser rock consisting of roughly equigranular calcite crystals. read more