Epsomite

Mg(SO₄)(H₂O)₆·H₂O

Grandfathered

Chemical formula (IMA record): Mg(SO₄)(H₂O)₆·H₂O
Recognition status: Grandfathered
Original-description year in master list: 1806
First-discovery country (IMA): United Kingdom
Crystal system: Not supplied in the IMA master list
Mohs hardness: Not supplied in the IMA master list
Measured density: Not supplied in the IMA master list
Historical discoverer: Not supplied in the IMA master list

How it occurs in nature

This species has a documented chemistry and recognition record in the IMA catalog. The master list does not describe its formation environment. Consult the cited mineral-description studies below for species-specific occurrence and geological context; these cannot be inferred reliably from the formula alone.

Discovery & scientific record

The country refers to the master list’s first-discovery country, using modern borders. It is not a list of all deposits. A question mark is retained when the source is uncertain; a special-procedure date can refer to redefinition rather than discovery.

Original reference: Journal de Physique, de Chimie, d´Histoire Naturelle et des Arts 62 (1806), 319

Additional reference: Atti della Società Toscana di Scienze Naturali, Mem., Ser. A (2019), 126, 33

IMA-CNMNC master list · page 64 ↗

RRUFF · further mineral research ↗ · Handbook of Mineralogy ↗

Catalog coverage and profile depth are different: every species in the cited IMA edition is indexed, but this edition does not provide every physical property or a full discovery narrative. The archive leaves those gaps explicit. Formulae and references are adapted from the IMA list under CC BY-SA 3.0; consult the original page for authoritative typography.

Reference snapshot: September 2026. Source dates and uncertainties are retained in the record.