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Acmonidesite

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About AcmonidesiteHide

Formula:
(NH4,K,Pb)8NaFe2+4(SO4)5Cl8
Colour:
brown
Lustre:
Vitreous
Specific Gravity:
2.56
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.


Classification of AcmonidesiteHide

Approved, Pending publication
Approval Year:
2013
7.AC.

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

Physical Properties of AcmonidesiteHide

Vitreous
Colour:
brown
Streak:
light brown
Cleavage:
None Observed
Fracture:
None observed
Density:
2.56 g/cm3 (Measured)    2.551 g/cm3 (Calculated)

Optical Data of AcmonidesiteHide

Type:
Biaxial (+)
RI values:
nα = 1.580(2) nβ = 1.590(2) nγ = 1.635(2)
2V:
Measured: 53° (3), Calculated: 51.6°
Max Birefringence:
δ = 0.055
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
Dispersion could not be observed because of the intense brown color of the mineral

Chemical Properties of AcmonidesiteHide

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

Crystallography of AcmonidesiteHide

Crystal System:
Orthorhombic
Class (H-M):
2 2 2 - Disphenoidal
Space Group:
C2 2 21
Setting:
C2 2 21
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)
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.049(37)
8.766(100)
5.178(45)
4.250(42)
3.203(29)
2.926(42)
2.684(32)
1.805(88)
Comments:
From Type Description.

Occurrences of AcmonidesiteHide

Paragenetic Mode(s):
•  Fumarolic

Type Occurrence of AcmonidesiteHide

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
Associated Minerals at Type Locality:

Synonyms of AcmonidesiteHide

Related Minerals - Nickel-Strunz GroupingHide

7.AC.Aluminopyracmonite(NH4)3Al(SO4)3Trig. 3 : R3
7.AC.05VanthoffiteNa6Mg(SO4)4Mon. 2/m : P21/b
7.AC.08Pyracmonite(NH4)3Fe(SO4)3Trig. 3m : R3c
7.AC.10Efremovite(NH4)2Mg2(SO4)3Iso.
7.AC.10LangbeiniteK2Mg2(SO4)3Iso. 2 3 : P21 3
7.AC.10ManganolangbeiniteK2Mn2(SO4)3Iso. 2 3 : P21 3
7.AC.15YavapaiiteKFe(SO4)2Mon. 2/m : B2/m
7.AC.15EldfelliteNaFe3+(SO4)2Mon. 2/m : B2/m
7.AC.20Godovikovite(NH4)Al(SO4)2Trig. 3 2 : P3 2 1
7.AC.20Sabieite(NH4)Fe3+(SO4)2Trig. 3 2 : P3 2 1
7.AC.25ThénarditeNa2SO4Orth. mmm (2/m 2/m 2/m) : Fddd
7.AC.30MetathénarditeNa2SO4Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
7.AC.35Aphthitalite(K,Na)3Na(SO4)2Trig.

Fluorescence of AcmonidesiteHide

None observed

Other InformationHide

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

References for AcmonidesiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Demartin, F., Campostrini, I. and Castellano, C. (2013) Acmonidesite, IMA 2013- 068. CNMNC Newsletter No. 18, December 2013, page 3250; Mineralogical Magazine, 77, 3249-3258.
Williams P A, Hatert F, Pasero M, Mills S J (2013) IMA Commission on new minerals, nomenclature and classification (CNMNC) Newsletter 18. New minerals and nomenclature modifications approved in 2013. Mineralogical Magazine 77, 3249-3258
Demartin, F., Castellano, C., & Campostrini, I. (2018). Acmonidesite, a new ammonium sulfate chloride from La Fossa Crater, Vulcano, Aeolian Islands, Italy. Mineralogical Magazine, 1-18.

Internet Links for AcmonidesiteHide

Localities for AcmonidesiteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy (TL)
 
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
Demartin, F., Campostrini, I. and Castellano, C. (2013) Acmonidesite, IMA 2013- 068. CNMNC Newsletter No. 18, December 2013, page 3250; Mineralogical Magazine, 77, 3249-3258.
Mineral and/or Locality  
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