Acmonidesite (original) (raw)

A valid IMA mineral species

About AcmonidesiteHide

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Formula:

(NH4,K,Pb)8NaFe2+4(SO4)5Cl8

Crystal System:

Orthorhombic

Name:

Name is from Acmonides (from the Greek Ακμωνιδης), cited by Ovidius as one of the Cyclops, who were helpers of Hephaistos, the mythological god of fire whose forge was alleged to be located at Vulcano.

This page provides mineralogical data about Acmonidesite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:45955:8

3154efe7-c4fb-448a-bc70-12711d7c828e

IMA Classification of AcmonidesiteHide

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IMA Formula:

(NH4,K,Pb,Na)9Fe2+4(SO4)5Cl8

Type description reference:

Demartin, Francesco, Castellano, Carlo, Campostrini, Italo (2019) Acmonidesite, a new ammonium sulfate chloride from La Fossa crater, Vulcano, Aeolian Islands, Italy. Mineralogical Magazine, 83 (1) 137-142 doi:10.1180/mgm.2018.115

Classification of AcmonidesiteHide

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7.BC.

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
C : With medium-sized and large cations

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of AcmonidesiteHide

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Density:

2.56 g/cm3 (Measured) 2.551 g/cm3 (Calculated)

Optical Data of AcmonidesiteHide

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RI values:

_n_α = 1.580(2) _n_β = 1.590(2) _n_γ = 1.635(2)

2V:

Measured: 53° (3), Calculated: 51.6°

δ = 0.055

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Dispersion:

Dispersion could not be observed because of the intense brown color of the mineral

Chemistry of AcmonidesiteHide

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Mindat Formula:

(NH4,K,Pb)8NaFe2+4(SO4)5Cl8

Crystallography of AcmonidesiteHide

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Crystal System:

Orthorhombic

Class (H-M):

222 - Disphenoidal

Cell Parameters:

a = 9.841(1) Å, b = 19.448(3) Å, c = 17.847(3) Å

Ratio:

a:b:c = 0.506 : 1 : 0.918

Unit Cell V:

3,415.70 ų (Calculated from Unit Cell)

Morphology:

Most common forms: {100}, {120}, {011}, {010} and {102}

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

From Type Description.

Geological EnvironmentHide

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Type Occurrence of AcmonidesiteHide

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General Appearance of Type Material:

Prismatic crystals to 0.1mm

Place of Conservation of Type Material:

Type material is deposited in the Reference Collection of the Dipartimento di Chimica, University of Milan, Milan, Italy, sample number 2013-02

Geological Setting of Type Material:

Fumarole, temperature about 250 °C

Associated Minerals at Type Locality:

Reference:

Demartin, F., Castellano, C., Campostrini, I. (2019) Acmonidesite, a new ammonium sulfate chloride from La Fossa crater, Vulcano, Aeolian Islands, Italy. Mineralogical Magazine: 83: 137-142.

Synonyms of AcmonidesiteHide

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Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of AcmonidesiteHide

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Other InformationHide

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Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for AcmonidesiteHide

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References for AcmonidesiteHide

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Reference List:

Demartin, Francesco, Castellano, Carlo, Campostrini, Italo (2019) Acmonidesite, a new ammonium sulfate chloride from La Fossa crater, Vulcano, Aeolian Islands, Italy. Mineralogical Magazine, 83 (1) 137-142 doi:10.1180/mgm.2018.115

Localities for AcmonidesiteHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.