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No, nickel is not a rock. It is a metallic element.
Diorite is not an element it is a rock type made up of several minerals. Therefore the term metallic or non-metallic can not be applied to it.
Limestone is a sedimentary rock.
Neodymium is not a rock but a metallic element which is found in some rocks.
Neither its a precious metal
Another name for the metallic silver dragres is Bismuth.
Most asteroids are rocky, but some are metallic.
Neither. It's a metallic element.
Titanium is a metallic element.
Limestone is a nonmetallic mineral. It is a sedimentary rock primarily composed of calcium carbonate, which is a chemical compound with a nonmetallic element (calcium) and a nonmetallic element (carbon) bonded together. Metallic minerals, on the other hand, are composed of metals or have metallic properties. Limestone does not fall into this category.
Chromium is not a rock, but rather a mineral. It is also a chemical element that is metallic and shiny.
The rock you're referring to is likely pyrite, also known as fool's gold. Pyrite is a metallic mineral that has a shiny, brassy color and can sparkle in the light.