Question

what mineral is this? mica feldspar calcite pyrite

Explanation:

Mica is a mineral known for its sheet - like or flaky structure. Feldspar has a more blocky or prismatic appearance. Calcite can have various crystal forms but is often more transparent or has a different cleavage pattern. Pyrite is usually more metallic - looking. Based on the flaky structure in the image, it resembles mica.

Answer:

Mica