SASS/SCSS object key value loop

Take a look at this example:

@include font-face('Entypo', font-files('entypo.woff'));

.icon {
  display: inline;
  font: 400 40px/40px Entypo;
}

.icon-star {
  @extend .icon;

  &:after {
    content: "\2605";
  }
}

.icon-lightning {
  @extend .icon;

  &:after {
    content: "\26A1";
  }
}

I want to make things as DRY as possible so I want to know if the following is possible, and if so how?

@include font-face('Entypo', font-files('entypo.woff'));

.icon {
  display: inline;
  font: 400 40px/40px Entypo;
}

$icons {
  $star: "\2605";
  $lightning: "\26A1";
}

@each $icon in $icons {
  $key = $icon{key}; // ???
  $value = $icon{value}; // ???

  .icon-#{$key} {
    @extend .icon;

    &:after {
      content: $value;
    }
  }
}