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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
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.
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.
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.