Substance Q boils at 445 °C and is a yellow solid at room temperature Which temperature could be the melting point of pure Q?

they both have a y in them

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).