IMA mineral species

Periclase

MgO

Magnesium oxide mineral.

Yellow Green Brown Black Gray White & Clear

Periclase specimen — Periclase - Ronneburg, Thuringia1.jpg · Wikimedia Commons (see file page for author & license)

Properties

Chemical formula	MgO
Elements	Mg, O
Crystal system	Cubic
Mohs hardness	5.5
Density	3.629 g/cm³
Streak	white
Color	—
IMA symbol	Per
Nickel–Strunz class	4.AB.25

“—” means no reliable value in Wikidata yet. Check Mindat for full data.

🌍 Where it's found

Type locality (where it was first described): Mount Somma, Italy

Type locality
Notable source / deposit
Country of origin

Marker positions are approximate (region or locality level). Type localities from Wikidata; notable sources curated by Crystopedia.

Varieties & related stones

Ferropericlase

Learn more

Periclase on Mindat.org
Wikipedia article
Wikidata item Q426635 (source of this page's data – you can correct it there)