IMA mineral species

Sigismundite

{Ba☐}{Fe²⁺☐}{Ca}{Na₂☐}{Fe²⁺₁₃}{Al}(PO₄)₁₁(HPO₄)(OH)₂

Phosphate mineral.

Sigismundite specimen — Sigismundite.jpg · Wikimedia Commons (see file page for author & license)

Properties

🔷 Monoclinic

Chemical formula	{Ba☐}{Fe²⁺☐}{Ca}{Na₂☐}{Fe²⁺₁₃}{Al}(PO₄)₁₁(HPO₄)(OH)₂
Elements	Ba, Fe, Ca, Na, Al, P, O, H
Crystal system	Monoclinic
Mohs hardness	—
Density	—
Streak	—
Color	—
IMA symbol	Sigm
Nickel–Strunz class	8.BF.05

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

Learn more

Sigismundite on Mindat.org
Wikidata item Q3623862 (source of this page's data – you can correct it there)