The forms in which various metals and non metals occur in nature are called minerals. Which of the following is not a metallic ferrous mineral?

ANS:D - Calcite

Calcite is not a metallic ferrous mineral. Explanation:

1. Cassiterite: Cassiterite is a metallic ore of tin (SnO2) and is commonly found in tin-bearing deposits.
2. Sphalerite: Sphalerite is a metallic ore of zinc (ZnS) and is one of the most important zinc ores.
3. Chalcopyrite: Chalcopyrite is a metallic ore of copper (CuFeS2) and is the most abundant copper ore.
4. Calcite: Calcite is a non-metallic mineral and is composed of calcium carbonate (CaCO3). It is not a metallic ferrous mineral. Calcite is commonly found in sedimentary rocks and is a major component of limestone and marble.

In summary, while cassiterite, sphalerite, and chalcopyrite are metallic ferrous minerals associated with tin, zinc, and copper respectively, calcite is a non-metallic mineral composed of calcium carbonate and does not belong to the category of metallic ferrous minerals.