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We present the first IRIS Mg II slit-raster spectra that fully capture thegenesis and coronal-jet-generating eruption of a central-disk solarminifilament. The minifilament arose in a negative-magnetic-polarity coronalhole. The Mg II spectroheliograms verify that the minifilament plasmatemperature is chromospheric. The Mg II spectra show that the eruptingminifilament's plasma has blueshifted upflow in the jet spire's onset andsimultaneous redshifted downflow at the location of the compact jet brightpoint (JBP). From the Mg II spectra together with AIA EUV images and HMImagnetograms, we find: (i) the minifilament forms above a flux cancelationneutral line at an edge of a negative-polarity network flux clump; (ii) duringthe minifilament's fast-eruption onset and jet-spire onset, the JBP beginsbrightening over the flux-cancelation neutral line. From IRIS2 inversion of theMg II spectra, the JBP's Mg II bright plasma has electron density, temperature,and downward (red-shift) Doppler speed of 1012 cm^-3, 6000 K, and 10 kms,respectively, and the growing spire shows clockwise spin. We speculate: (i)during the slow rise of the erupting minifilament-carrying twisted flux rope,the top of the erupting flux-rope loop, by writhing, makes its field directionopposite that of encountered ambient far-reaching field; (ii) the erupting kinkthen can reconnect with the far-reaching field to make the spire and reconnectinternally to make the JBP. We conclude that this coronal jet is normal in thatmagnetic flux cancelation builds a minifilament-carrying twisted flux rope andtriggers the JBP-generating and jet-spire-generating eruption of the flux rope.

Genesis and Coronal-jet-generating Eruption of a Solar Minifilament Captured by IRIS Slit-raster Spectra