Question

what mineral is this?
pyrite
mica
feldspar
calcite

Explanation:

Calcite is typically white or colorless and has a crystalline structure. Pyrite is usually brass - yellow. Mica has a flaky appearance. Feldspar has a more glassy or pearly luster compared to the more 'chalky' or 'earthy' look of calcite in some forms (although calcite can also have a vitreous luster in well - formed crystals, the overall texture and color in this image are more consistent with calcite).

Answer:

Calcite