.icon-brick{
  background-image: url(../img/icon-brick.png);
}
.icon-half-broken-brick{
  background-image: url(../img/icon-half-broken-brick.png);
}
.icon-broken-brick{
  background-image: url(../img/icon-broken-brick.png);
}
.icon-brick-powder{
  background-image: url(../img/icon-brick-powder.png);
}
.icon-rock{
  background-image: url(../img/icon-rock.png);
}
.icon-broken-rock{
  background-image: url(../img/icon-broken-rock.png);
}
.icon-rock-powder{
  background-image: url(../img/icon-rock-powder.png);
}
.icon-stone{
  background-image: url(../img/icon-rock.png);
}
.icon-broken-stone{
  background-image: url(../img/icon-broken-rock.png);
}
.icon-stone-powder{
  background-image: url(../img/icon-rock-powder.png);
}
.icon-sand{
  background-image: url(../img/icon-sand.png);
}