Question

what mineral is this? mica calcite feldspar pyrite

Explanation:

Mica has a flaky, sheet - like structure and is often found in rocks with a layered appearance. Calcite is usually more transparent or has a crystal - clear look in pure form and can effervesce with acid. Feldspar has a more blocky, glassy appearance. Pyrite has a metallic luster and a brassy yellow color. Based on the general appearance (assuming typical characteristics and without more detailed tests like hardness or acid reaction), if we consider the visual cues of a more flaky and sheet - like structure (a common trait of mica in such images), mica is a candidate.

Answer:

Mica