Acmonidesite
| Acmonidesite | |
|---|---|
| General | |
| Category | Minerals |
| Formula | (NH4,K,Pb,Na)9Fe2+4(SO4)5Cl8 |
| IMA symbol | Acm |
| Strunz classification | 7.BC. |
| Identification | |
| Color | Brown |
| Twinning | None |
| Cleavage | None |
| Fracture | None |
| Luster | Vitreous |
| Streak | Light brown |
| Specific gravity | 2.56 |
| Density | 2.551 g/cm3 |
| 2V angle | 51.6° |
| Dispersion | None observed |
Acmonidesite (NH4,K,Pb,Na)9Fe2+4(SO4)5Cl8) is a microscopic brown mineral, discovered in 2013 and described in 2019.[1]
Its name comes from the mythical Greek cyclops Acmonides, said to be one of the three helpers of the god Hephaestus, the god of fire and forging, with his forge said to be located at Vulcano, also the type locality of the mineral.[2]
References
[edit]- ^ "Acmonidesite". Mindat. Retrieved 2025-08-02.
- ^ Demartin, Francesco; Castellano, Carlo; Campostrini, Italo (February 2019). "Acmonidesite, a new ammonium sulfate chloride from La Fossa crater, Vulcano, Aeolian Islands, Italy". Mineralogical Magazine. 83 (1): 137–142. Bibcode:2019MinM...83..137D. doi:10.1180/mgm.2018.115. hdl:2434/632842. ISSN 0026-461X.
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