Tourmalinated quartz is a genuine geological pairing rather than a fanciful marketing name for two stones glued together. Black tourmaline, almost always the common iron rich variety schorl, crystallizes readily in the same granite pegmatite environments where quartz forms, and where the two grow together, needle like tourmaline crystals become trapped inside a quartz crystal still in the process of forming around them, sealed in permanently once the quartz finishes solidifying. The needles can run in dense sprays or scattered single crystals, and pieces are cut and polished specifically to display them suspended in the clear or lightly smoky host rather than faceted to hide them, since the inclusions are the entire visual appeal of the material.
Because the stone is a physical combination of two well documented minerals, quartz's own catalogued properties and black tourmaline's own catalogued properties, rather than an independently occurring variety with a separate identity, the modern metaphysical literature treats it the same way: not as a stone with its own distinct correspondence, but as a deliberate pairing of quartz's reputation for clarity and amplification with black tourmaline's reputation for grounding and protection, the same two reputations this atlas records on those two component stones individually. That framing is at least honest about the material's structure, whatever one makes of the properties attributed to either component: two minerals, genuinely intergrown, each keeping the description already given to it on its own.
Sources Mindat.org - The Mineralogical ReferenceHudson Institute of Mineralogy with Cunningham's Encyclopedia of Crystal, Gem & Metal MagicScott Cunningham