Why is a synthetic gemstone (made by humans) not considered a mineral?

Iwll give extra points to who gets this for ! what type of reaction is this? ?

Acrystal that absorvd water from air is (blank)a. aqueousb. homogenousc. hygroscopicd. efflorescent

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.