Epsomite
Epsom salt, a magnesium sulphate that crystallises on CI chondrites in collections.
Key facts
- Formula
- MgSO4·7H2O
- Family
- Carbonates, sulphates, salts and weathering products
- Crystal system
- Orthorhombic
What it is
Epsomite is magnesium sulphate with seven water molecules. It dissolves easily in water and grows as white crusts as solutions dry out. It is named after Epsom in Surrey, where it was found in spring water.
Where it is found
It grows on and in CI chondrites such as Orgueil, often appearing as white efflorescence after years in a museum drawer. Most of it is thought to have formed after the fall.
How it is recognised
It forms white, fibrous crusts that dissolve in water and taste bitter, though meteorites should never be tasted.
Did you know?
Did you know?
Epsom salts are used in baths and in gardening.
Did you know?
Magnesium sulphates are also found on Mars and are thought to be present on Jupiter's moon Europa.