The difference between Heterogeneous and Mixed

When used as adjectives, heterogeneous means diverse in kind or nature, whereas mixed means having two or more separate aspects.

check bellow for the other definitions of Heterogeneous and Mixed

Heterogeneous as an adjective:

Diverse in kind or nature; composed of diverse parts.

Examples:

"He had a large and heterogeneous collection of books."
Heterogeneous as an adjective (mathematics):

Incommensurable because of different kinds.
Heterogeneous as an adjective (physics, chemistry):

Having more than one phase (solid, liquid, gas) present in a system or process.
Heterogeneous as an adjective (chemistry):

Visibly consisting of different components.
Heterogeneous as an adjective (computing):

Of a network comprising different types of computers, potentially with vastly differing memory sizes, processing power and even basic underlying architecture; alternatively, of a data resource with multiple types of formats.

Mixed as an adjective:

Having two or more separate aspects.

Examples:

"I get a very mixed feeling from this puzzling painting."
Mixed as an adjective:

Not completely pure, tainted or adulterated.

Examples:

"My joy was somewhat mixed when my partner said she was pregnant: it's a lot of responsibility."
Mixed as an adjective:

Including both male(s) and female(s).

Examples:

"The tennis match was mixed with a boy and a girl on each side."

"My son attends a mixed school, my daughter an all-girl grammar school."
Mixed as an adjective:

Stemming from two or more races or breeds

Examples:

"The benefit dog show has both mixed and single-breed competitions."

"Mixed blood can surprisingly produce inherited properties which neither parent showed"