The story of Marble\Limestone

Limestone and Marble seem to regular Rock farmers. Like Apple jack and Big Mac. One is the quite worker the other is the matron, caretaker, the one in charge. Thy value respect the old cultural traditions an keep the business running. Limestone may be like applejack for being an earth pony, or leading the farm. But like Rainbow dash she has big dreams and goals for the future that may take her away from the farm. She cannot be a wonderbolt as she lacks wings, her
R goal is to join the royal army and one day and fight for her country.
Limestone is a mixture of Apple jack and Rainbow Dash. She may have had the chance or not to join the Army but she scrafices he opportunity to become a guard because her family needs her. On the farm while growing up she learned many skills and most of those can be acknowledged as guard. Her cutie mark for example means that she is as sour as lime and hard as a stone. On the negative side but on the other hand those personalities developed great potential in her. Apart from being sour and hard she is strong, fierce, determined, loyal, devoted, brave and tough. Some of those qualities are important as a knight.
Marble on the other hand is a Mystery. It is said that she doesn't take her families farm for granite. She prefers to play a little game of hide and seek, that is until no one can find her. That is was her Marbles represents. Inner beauty . she remains on the families farm because she sees the true beauty of the farm but also means hidden mystery. She remain ns hidden. Observe without being seen. She could be some were but o one knows she is there. What if she has been to the gala many times before. Yet it has always reain Ed a mystery. She was there but not. Also if I said limey is a mixture of rd an Marble is a mixture of rarity and fs. She may be shy and frightened to meet ponies cos she is used to not being seen. So we got ta brave Knight and the spy party planner and geologists.