Oesel - L6 Ordinary Chondrite

Oesel is a historic witnessed L6 Ordinary Chondrite fall from Saaremaa Island, Estonia, which occurred on 11 May 1855. The meteorite fell near the village of Merise, on land associated with Kaanda farm, and is also known by historic synonyms including Kaande, Ezel, and Estland. With a reported recovered mass of around 6 kg, Oesel is one of only a small number of approved Estonian meteorites and an important early recorded fall from the Baltic region.

Oesel specimens are classified as L6 Ordinary Chondrite material, meaning they have lower metallic iron than H Chondrites and have experienced a high degree of thermal metamorphism on their parent asteroid. Type 6 Chondrites are strongly recrystallised, so original chondrules are usually subdued compared with less altered type 3 or 4 material. Historic descriptions note olivine-hypersthene Chondritic material, consistent with an equilibrated stony meteorite.

Studying Oesel provides insight into L Chondrite parent bodies, thermal alteration, and the history of early scientifically recorded meteorite falls in northern Europe. Its Estonian provenance, witnessed fall status, historic synonyms, and limited recovered mass make it especially appealing for collectors of classic falls and European meteorites. Each specimen represents ancient asteroid material formed over 4.5 billion years ago, connected to a documented fall from 1855.