The Joaquin quartz monzonite is a Mesoproterozoic pluton in northern New Mexico.

The unit is a pink fine- to medium-grained rock with microcline megacrysts in some locations.

Present as accessories are opaque minerals, chlorite, sericite, myrmekite apatite, sphene, zircon, and epidote.

There are indications the pluton was emplaced as a magma and that stoping and assimilation were important in accommodation.

[1] The unit was first described as the Joaquin Granite by Woodward et al. in their 1974 survey of the Precambrian rocks of the southern Nacimiento Mountains.