The phrase "also a mirror of" is correct and usable in written English.
It can be used to indicate that something reflects or represents another thing, often in a metaphorical sense.
Example: "The artwork is also a mirror of the artist's inner struggles and emotions."
Alternatives: "also a reflection of" or "also indicative of".
"Professional soccer is also a mirror of economic possibilities," the paper wrote.
A woman, probably the patient's mother, cringes in the gloaming, a counterpoint to Gross's masculine assurance, but also a mirror of our likely reaction.
He meant a mirror held up to the audience, but it is, of course, also a mirror of Key's and Peele's own attitudes, which, like everybody's, aren't always completely within their control.
It's also a mirror of where he's at.
Because Batman saves the Joker, and then later he is pointedly unable to save Dent from his fall and is faced with the decision to either await the coin's outcome or refuse to leave things to chance and instead take direct action (the opposite of Dent's outlook, of course, but also a mirror of the fact Dent does make a choice to pick the options and to flip the coin).
But this is also a mirror image of what is happening in France".
"The Show Must Go On," a work by another French choreographer, Jérôme Bel, which also offers viewers a mirror of themselves, comes to mind briefly.
Theatre also serves as a mirror of a community's behaviour.
A succinct summary of information from time to time not only allows for clarity in the communication process but also gives the informant a mirror of just what has occurred.
Actually, high levels of triglycerides are important risk factors for cardiovascular disease not only for the metabolic and biochemical properties but also because they are a mirror of the incorrect dietary habits.
They also view the Ruhr as a mirror of troubles afflicting most developed nations today - the United States included - which are struggling to salvage heavy, basic industries under attack from low-cost foreign producers and from substitute materials, such as plastic and aluminum.
