The Steven Universe guidebook has Jasper, Amethyst, and Rose Quartz all classified as Quartzes. And now Peridot has confirmed that “big muscular soldier types” is the quartz template.
Clearly, all the tall/broad warrior characters have to be Quartz subtypes.
Three members of Thorn’s team, plus a bonus character. Violet is an Amethyst, Birch is a Blue Quartz, Rowan is a Carnelian, and Secret Agent D is a Bloodstone.