The phrase "a unique mixture of" is correct and usable in written English.
It can be used to describe a combination of different elements or qualities that are distinct or one-of-a-kind.
Example: "The dish is a unique mixture of flavors, blending sweet, savory, and spicy ingredients."
Alternatives: "an exceptional blend of" or "a distinctive combination of".
Their continued appeal (a unique mixture of affection and awe) is a heartening thing.
Bari's gastronomy is a unique mixture of seafood, fish and agricultural products.
He is a unique mixture of coolness and intensity, superb formal ability and awkward daring.
His contribution to the real estate community was a unique mixture of business and friendship.
Material characterization reveals the presence of a unique mixture of phases of SiO2 and Si.
Equiano's autobiography, Carretta suggests, is a monumental 18th-century text, a unique mixture of travel-writing, sea lore, sermon, economic tract and fiction.
"This guy is a very hard case," said one official, who described Mr. Padilla as a "possibly unique mixture of a Chicago hardened ex-con street gang member, mixed with the single-mindedness of an Al Qaeda member".
These various raw materials are shaped with a homogenized unique mixture of black color with the help of gum.
Each terminal node can be viewed as a unique mixture, defined by the path of partitions, or splits, leading from the root node to that particular terminal node.
The terrorists used the flat to make the bombs from an "entirely unique" mixture of concentrated hydrogen peroxide and pepper, the hearing was told.
But for those of us from Texas who don't think of Austin as the center of the universe, especially those of us who trace our heritage in Texas back to the Spanish colonial era (like your humble narrator here), the Sedacca piece came off like an extreme example of the unique mixture of provinciality and hipster arrogance that Austin has become infamous for.
