RUSTENBURG LAYERED SUTE 
Photomicrographs of selected thin sections 

All photographs have a horizontal field of 6mm, except where individually given in the caption 

LZ = Lower Zone (ultramafic cumulates), LCZ = Lower Critical Zone (chromite seams in ultramafic cumulates), UCZ  = Upper Critical Zone (chromite seams in norites and anorthosites), MZ = Main Zone (mainly gabbronorites), UZ = Uper Zone (magnetite gabbonorites)

  LZ - Dunite, olivine cumulate, partly serpentinised - PPL   LZ - Dunite, olivine cumulate, partly serpentinised - XP
  LZ - Peridotite, olivine + opx adcumulate - PPL   LZ - Peridotite, olivine + opx adcumulate - XP
  LZ - Pyroxenite, opx adcumulate - PPL   LZ - Pyroxenite, opx adcumulate - XP
LZ - Pyroxenite, opx orthocumulate with intercumulus cpx - XP LZ - Pyroxenite, opx orthocumulate with intercumulus plag - PPL
  LCZ - Chromite pyroxenite, chrom + opx cumulate - PPL LCZ - Chromite pyroxenite, chrom + opx orthocumulate with intercumulus plag - PPL
  LCZ - Chromite pyroxenite, chrom + opx orthocumulate with intercumulus plag - XP LCZ - Pyroxenite, opx + minor chrom orthocumulate with intercumulus plag - PPL
  LCZ - Pyroxenite, opx + minor chrom orthocumulate with intercumulus plag - XP   LCZ - Pyroxenite, opx adcumulate with trace chromite - PPL
  LCZ - Pyroxenite, opx adcumulate - PPL   LCZ - Pyroxenite, opx adcumulate - XP 
UCZ - Chromite pyroxenite, chrom + opx orthocumulate with intercumulus plag - PPL UCZ - Chromite pyroxenite, chrom + opx adcumulate - PPL
  UCZ - Chromite pyroxenite, chrom + opx adcumulate - XP UCZ - Chromite pyroxenite, basal chromite adcumulate grading up into chrom + opx orthocumulate - 3mm - PPL
  UCZ - Chromite cumulate grading up into chrom + opx cumulate - 3mm - PPL UCZ - Chomite orthocumulate with intercumulus opx and plag - 3mm - PPL
  UCZ - Pyroxenite, opx orthocumulate with intercumulus plag and trace chromite - PPL   UCZ - Pyroxenite, opx orthocumulate with intercumulus plag and trace chromite - PPL
  UCZ - Norite, opx + plag cumulate - PPL   UCZ - Norite, opx + plag cumulate - XP
UCZ - Leuconorite, plag + opx cuulate - PPL UCZ - Leuconorite, plag + opx cuulate - XP
UCZ - Spotted Anorthosite, plag orthocumulate with intercumulus opx - PPL UCZ - Spotted Anorthosite, plag orthocumulate with intercumulus opx - XP
UCZ - UG1 Chromite Anorthosite, alternating chrom and plag cumulates - PPL   UCZ - UG1 Chromite Anorthosite, alternating chrom and plag cumulates - PPL
UCZ - UG2 Chromite Seam, bright grey chromite embedded in dark grey intercumulus plag - Reflected Light - 2mm - PPL Merensky Reef - Bottom chromite seam overlain by sulphide pyroxenite - 3mm - PPL
Merensky Reef - bottom chromite seam overlain by sulphide + phlogopite pyroxenite - 3mm - PPL Merensky Reef - bottom chromite seam overlain by sulphide + phlogopite pyroxenite - 3mm - XP
Merensky Reef - bottom chromite seam, chromite orthocumulate with intercumulus plag + opx - 3mm - PPL Merensky Reef - bottom chromite seam, chromite partly recrystallised into aggregates - 3mm - PPL
  Merensky Reef - bottom chromite seam with sulphide inclusions - Reflected Light - 2mm - PPL   Merensky Reef - interstitial magmatic sulphide surrounded by euhedral cumulate opx - PPL
  Merensky Reef - interstitial magmatic sulphide surrounded by euhedral cumulate opx - XP (thick section)  MZ - Gabbronorite, plag + opx + cpx cumulate - PPL
  MZ - Gabbronorite, plag + opx + cpx cumulate - XP MZ - Gabbronorite, plag + opx + cpx cumulate - PPL
MZ - Gabbronorite, plag + opx + cpx cumulate - XP   MZ - Gabbronorite, plag + inverted pigeonite+ cpx cumulate, plag has dusty inclusions (Belfast "black granite") - PPL
  MZ - Gabbronorite, inverted pigeonite with typical herringbone exsolution texture - 3mm - XP   MZ - Gabbronorite, interstitial granophyric intergrowth of quartz and alkali feldspar - 3mm - XP
    UZ - Magnetite gabbronorite, plag + opx + cpx + minor mt cumulate - PPL   UZ - Magnetite gabbronorite, plag + opx + cpx + mt cumulate - PPL
  UZ - Magnetite gabbronorite, plag + opx + cpx + minor mt cumulate, elongate plag shows preferred orientation in plane of layering - PPL UZ - Magnetite gabbronorite, plag + opx + cpx + minor mt cumulate, elongate plag shows preferred orientation in plane of layering - XP
UZ - Magnetite anorthosite, plag cumulate with abundant intercumulus mt - PPL UZ - Magnetite anorthosite, plag + mt cumulate with intercumulus cpx + opx, distinct lamination of prismatic plag - 20mm - PPL