Crystallization sequence of Al 2 SiO 5 polymorphs in a sample from an early Paleozoic metamorphic unit (Silgará Schist) in the Northern Andes of Colombia is interpreted to be kyanite → andalusite → sillimanite (fibrolite), the least common sequence in samples where the three polymorphs coexist. This interpreted sequence has important implications in terms of tectonic evolution of the pre-Cretaceous crystalline core of the Northern Andes. Like interpretations in other geological provinces, the sequence kyanite → andalusite → sillimanite observed here is linked to polymetamorphism during two unrelated tectonic episodes. Kyanite grew during a prograde early Paleozoic Barrovian metamorphic event at pressures between 7 and 9 kbar. During a late Triassic – Jurassic overprinting low pressure event andalusite + sillimanite formed (P < 3.8 kbar). The Barrovian Silgará Schist sequence shows staurolite appearing almost coincidently with garnet and before than kyanite. Kyanite crystallized in a chlorite free assemblage following a prograde trajectory and persisted metastably during the overprinting event.