In a small bowl, whisk olive oil, lime zest, lime juice and salt and pepper and set aside.
In a large bowl, combine quinoa, black beans, bell pepper, green onions and cilantro (hold the mango for now).
Stir up dressing once more and drizzle over quinoa salad. Toss to distribute evenly.
Then add mango chucks and toss gently. Add additional salt and pepper to taste.
Chill and serve.