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Organic Mineral

Thebaite-(NH4)

(NH₄)₃Al(C₂O₄)(PO₃OH)₂(H₂O)
Hardness1.5–2
Crystal systemMonoclinic
ClassOrganic Mineral
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Thebaite-(NH4)

Thebaite-(NH4) is an IMA-recognized mineral species in the organic mineral class, with the chemical formula (NH₄)₃Al(C₂O₄)(PO₃OH)₂(H₂O).

It crystallizes in the monoclinic crystal system (space group P2_1/c). It is a member of the Not in a structural group, Oxalate structural group.

Key properties: Mohs hardness 1.5–2; specific gravity 2.093; White streak; Vitreous luster; optically biaxial.

IMA symbol Thb-NH4, IMA status: approved, named in 2021.

Part of a bat-guano-related, post-mining assemblage of phases in a hot and humid area underground.

It is found associated with Antipinite, vanadinite.

The name refers to Theba, Arizona, a small settlement and railroad depot ~20 km southeast of the Rowley mine. The (NH4) suffix indicates NH4+ > K+.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet. Browse more T minerals or help write this entry.