Mundrabillaite
Mundrabillaite is an IMA-recognized mineral species in the phosphate class, with the chemical formula (NH₄)₂Ca(PO₃OH)₂·H₂O.
It crystallizes in the monoclinic crystal system.
Key properties: specific gravity 2.09; White streak; Dull luster; optically biaxial.
IMA symbol Mb, IMA status: approved, named in 1978.
Derived from bat guano and urine in caves.
It is found associated with Biphosphammite, archerite, aphthitalite, halite, syngenite, stercorite, oxammite, weddellite, whitlockite, guanine, newberyite, calcite (Petrogale Cave.
The name refers to Mundrabilla Station, nearby the Petrogale Cave, Western Australia.
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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