Cloudy Quartz

Cloudy Quartz is a member of the Pie family. She is the husband of Igneous Rock Pie, and the parent of Limestone Pie, Maud Pie, Pinkie Pie, and Marble Pie.

Depiction in the series
Cloudy Quartz first appears in Pinkie Pie's flashback in The Cutie Mark Chronicles in which Pinkie throws a party to spread cheer to her family. Shocked by the party at first, Cloudy slowly smiles and join in the festivities.

She appears in Trixie's flashback in Magic Duel.

She appears in a photo with their daughters in Pinkie Pride.

Pinkie alludes to her mom and dad in The Cutie Map - Part 1 when she sees the rock farm on the eponymous map. In Make New Friends but Keep Discord, Cloudy Quartz is indirectly mentioned by Pinkie because Pinkie originally invited her to the Grand Galloping Gala. In Party Pooped, Applejack finds plans in Pinkie Pie's secret party-planning room for Igneous Rock and Cloudy Quartz's fiftieth, one-hundredth, and five-hundredth anniversaries.

Cloudy Quartz has a major role in Hearthbreakers when the Apple family and Pie family spend Hearth's Warming Eve together. She is depicted as stereotypically Amish, speaking in old English and acting very traditional. Initially unreceptive to the Apples' traditions, she and Igneous Rock eventually come to accept them, with Igneous even trying to adopt some of Granny Smith's country mannerisms.

Cloudy appears at the beginning of Rock Solid Friendship attending Maud's graduation ceremony.

In the holiday special My Little Pony Best Gift Ever, she and Igneous appear celebrating Hearth's Warming Eve with her family and Applejack's family.

Cloudy briefly appears in Pinkie Pie's group shot during The Magic of Friendship Grows in The Last Problem.

Trivia

 * Cloudy Quartz is the fourth Earth pony mare to have Cathy Weseluck as her voice actress, following Mayor Mare, Lily Valley, and Golden Harvest (Season 1).
 * She is the eighth earth pony mare who has Andrea Libman as her voice actress, following Pinkie Pie, Daisy (Season 2), Apple Leaves (Season 3), Hinny of the Hills (Season 4), Strawberry Ice, Chock-full Carafe and Raspberry Beret (all of them are also from Season 5).