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Argesite

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About ArgesiteHide

Brontes, Arges, and Steropes
Formula:
(NH4)7Bi3Cl16
Colour:
Pale yellow
Lustre:
Vitreous
Specific Gravity:
2.88
Crystal System:
Trigonal
Name:
After Uranus’s son Arges, one of the three Cyclops who were helpers of Hephaistos, the ancient Greek god of fire (Vulcanus for the ancient Romans) whose workshops were alleged to be located at Vulcano island (or Etna).
Unique combination of elements. One of two NH4-Bi minerals, the second being campostriniite.


Classification of ArgesiteHide

Approved
Approval Year:
2011

Physical Properties of ArgesiteHide

Vitreous
Colour:
Pale yellow
Streak:
White
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
2.88(1) g/cm3 (Measured)    2.843 g/cm3 (Calculated)

Optical Data of ArgesiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.731() nε = 1.725(2)
Max Birefringence:
δ = 0.006
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of ArgesiteHide

Formula:
(NH4)7Bi3Cl16
IMA Formula:
(NH4)7Bi3Cl16

Crystallography of ArgesiteHide

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
R3c
Setting:
R3c
Cell Parameters:
a = 13.093(1) Å, c = 102.682(9) Å
Ratio:
a:c = 1 : 7.843
Unit Cell V:
15245 ų
Z:
18
Morphology:
Habit is almost tabular [according to the {001} pinacoid] and in most cases is very complex, due to the presence of various rhombohedra and bipyramids.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.46 (11)
6.14 (16)
5.71 (11)
3.808 (44)
3.164 (100)
2.742 (24)
1.906 (16)
1.686 (13)

Type Occurrence of ArgesiteHide

General Appearance of Type Material:
Pale-yellow crystals up to 0.15 mm in length.
Place of Conservation of Type Material:
Type material is deposited in the Reference Collection of the DCSSI, University of Milan, Milan, Italy, sample number 2011-04.
Geological Setting of Type Material:
In an active medium-temperature (~250 °C) intracrater fumarole on a pyroclastic breccia.
Associated Minerals at Type Locality:

Synonyms of ArgesiteHide

Fluorescence of ArgesiteHide

Non-fluorescent.

Other InformationHide

Notes:
The mineral is not hygroscopic and is stable in open air.
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 ArgesiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Demartin, F., Campostrini, I., Castellano, C., Gramaccioli, C.M. (2011) Argesite, IMA 2011-072. CNMNC Newsletter No. 11, December 2011, page 2892; Mineralogical Magazine: 75: 2887-2893.
Demartin, F., Campostrini, I., Castellano, C., Gramaccioli, C.M. (2012) Argesite, (NH4)7Bi3Cl16, a new mineral from La Fossa Crater, Vulcano, Aeolian Islands, Italy: a first example of the [Bi2Cl10]4- anion. American Mineralogist: 97: 1446-1451.

Internet Links for ArgesiteHide

Localities for ArgesiteHide

ⓘ - 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., Castellano, C. and Gramaccioli, C.M. (2011): Argesite, IMA 2011-072. CNMNC Newsletter No. 11, December 2011, page 2892; Mineralogical Magazine, 75, 2887-2893.
Mineral and/or Locality  
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