Espadaite
Espadaite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Na₄Ca₃Mg₂[AsO₃(OH)]₂[AsO₂(OH)₂]₁₀(H₂O)₆·H₂O.
It crystallizes in the orthorhombic crystal system (space group Ccca).
Key properties: Mohs hardness 2; specific gravity 2.73; White streak; Vitreous luster; optically biaxial.
IMA symbol Esp, IMA status: approved, named in 2018.
It is found associated with Camanchacaite, anhydrite, gypsum, halite, talmessite.
The name comes from the Spanish, espada, for ‘sword’, in allusion to the shape of the crystals.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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