Crystopedia
IMA mineral species

Hydromagnesite

Mg₅(CO₃)₄(OH)₂·4H₂O

Carbonate mineral.

White & Clear

Hydromagnesite specimen
Hydromagnesite.png · Wikimedia Commons (see file page for author & license)

Properties

Chemical formulaMg₅(CO₃)₄(OH)₂·4H₂O
ElementsMg, C, O, H
Crystal systemMonoclinic
Mohs hardness3.5
Density—
Streakwhite
Color—
IMA symbolHmgs
Nickel–Strunz class5.DA.05

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

🌍 Where it's found

Type locality (where it was first described): Hoboken, United States

  • 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

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