Synthetic molded slabs, and systems and methods related thereto

A set of separately molded synthetic slabs having generally the same rectangular major surface appearance defined by a same set of particulate mineral mixes, each respective slab of the set comprising at least two different particulate mineral mixes positioned relative to one another according to at least two predefined stencil patterns for each of the synthetic slabs in the set of separately molded synthetic slabs, wherein a first mix of the at least two different particulate mineral mixes occupies a full thickness of each respective slab at first regions in which a second mix of the at least two different particulate mineral mixes is absent, and the second mix of the at least two different particulate mineral mixes occupies the full thickness of each respective slab at second regions in which the first mix of the at least two different particulate mineral mixes is absent, the at least two different particulate mineral mixes each comprising a quartz material, one or more pigments, and one or more resin binders, wherein each respective slab is rectangular and has a major surface with a width of at least 3 feet and a length of at least 6 feet;

• wherein the third particulate mineral mix forms a vein that extends across a full width of the major surface.