Errachidia 004 is a rare Winonaite from the Errachidia region of Morocco, found in 2020 near the rural community of Oued Naam. Winonaites are Primitive Achondrites, representing material that experienced heating, recrystallisation, and partial melting on an early asteroid parent body without fully separating into a typical core and mantle structure. With a reported total mass of around 2.64 kg, Errachidia 004 is a limited and scientifically interesting example of this transitional meteorite group.

Errachidia 004 is notable for containing distinct low-metal and high-metal lithologies. Around 75 percent of recovered fragments are reported to show low visible iron-nickel metal, while the remaining material contains much higher metal abundance. This variation gives specimens a wide range of appearances, from fine-grained stony material with little visible metal to metal-rich sections that can show strong contrast and, in some cases, internal metallic structure.

Studying Errachidia 004 provides valuable insight into the complex transition between primitive Chondritic material and more evolved Achondrites. Its polymict nature and mixed metal content record a history of heating, partial melting, and impact processing on an early parent body. For collectors, Errachidia 004 offers a scarce and visually varied Winonaite with recognised Moroccan provenance and strong scientific appeal. Each specimen represents ancient solar system material that preserves an intermediate stage in planetary evolution.