From MTZ2VARIOUS documentation:

Below is a list of the items output to the CIF file:

 _entry.id

 _audit.revision_id
 _audit.creation_date
 _audit.creation_method
 _audit.update_record

 _cell.entry_id
 _cell.length_a
 _cell.length_b
 _cell.length_c
 _cell.angle_alpha
 _cell.angle_beta
 _cell.angle_gamma

 _symmetry.entry_id
 _symmetry.Int_Tables_number
 _symmetry.space_group_name_H-M
 _symmetry_equiv.id
 _symmetry_equiv.pos_as_xyz

 _reflns.entry_id
 _reflns.d_resolution_high
 _reflns.d_resolution_low
 _reflns.limit_h_max
 _reflns.limit_h_min
 _reflns.limit_k_max
 _reflns.limit_k_min
 _reflns.limit_l_max
 _reflns.limit_l_min
 _reflns.number_all
 _reflns.number_obs

 _diffrn_radiation_wavelength.id
 _exptl_crystal.id
 _reflns_scale.group_code

These items are the ones per reflection.

 _refln.wavelength_id     Always written
 _refln.crystal_id        Always written
 _refln.scale_group_code  Always written
 _refln.index_h           Always written
 _refln.index_k           Always written
 _refln.index_l           Always written
 _refln.status            Always written
 _refln.F_meas_au         FP
 _refln.F_meas_sigma_au   SIGFP
 _refln.F_calc            FC
 _refln.phase_calc        PHIC
 _refln.phase_meas        PHIB
 _refln.fom               FOM
 _refln.intensity_meas    I
 _refln.intensity_sigma   SIGI
 _refln.ebi_F_xplor_bulk_solvent_calc        FPART_BULK_S
 _refln.ebi_phase_xplor_bulk_solvent_calc'   PHIPART_BULK_S
 _refln.ccp4_SAD_HL_A_iso               HLA
 _refln.ccp4_SAD_HL_B_iso               HLB
 _refln.ccp4_SAD_HL_C_iso               HLC
 _refln.ccp4_SAD_HL_D_iso               HLD
 _refln.ccp4_SAD_F_meas_plus_au         F(+)
 _refln.ccp4_SAD_F_meas_plus_sigma_au   SIGF(+)
 _refln.ccp4_SAD_F_meas_minus_au        F(-)
 _refln.ccp4_SAD_F_meas_minus_sigma_au  SIGF(-)
 _refln.ccp4_SAD_phase_anom             DP
 _refln.ccp4_SAD_phase_anom_sigma       SIGDP
 _refln.ccp4_I_plus                     I(+)
 _refln.ccp4_I_plus_sigma               SIGI(+)
 _refln.ccp4_I_minus                    I(-)
 _refln.ccp4_I_minus_sigma              SIGI(-)