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Hilarionite

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Formula:
Fe23+(SO4)(AsO4)(OH)·6H2O
System:
Monoclinic
Colour:
Light green to light ...
Lustre:
Vitreous, Silky
Hardness:
2
Name:
For the type locality, the Hilarion mine, Lavrion, Attica, Greece.
Related to and easily confused with kaňkite.


Classification of Hilarionite

Approved
Approval Year:
2011

Physical Properties of Hilarionite

Vitreous, Silky
Colour:
Light green to light yellowish-green
Comment:
Light green, with typically olive or greyish tint
Hardness (Mohs):
2
Comment:
Ca. 2
Tenacity:
Flexible
Fracture:
Irregular/Uneven, Splintery
Density:
2.40(5) g/cm3 (Measured)    2.486 g/cm3 (Calculated)

Optical Data of Hilarionite

Type:
Biaxial (+)
RI values:
nα = 1.575(2) nγ = 1.640(2)
2V:
Measured: large°
Max Birefringence:
δ = 0.065
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Hilarionite

Formula:
Fe23+(SO4)(AsO4)(OH)·6H2O
IMA Formula:
Fe23+(SO4)(AsO4)(OH) · 6H2O
Elements listed in formula:
Analytical Data:
Electron probe, averaged for 7 analyses; H2O by modified Penfield method
MnO(0.03)
CuO(0.18)
ZnO(0.17)
Fe2O3(33.83)
P2O5(0.22)
As2O5(18.92)
SO3(22.19)
H2O(26.3)
total 101.82 wt %.

Crystallography of Hilarionite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Space Group Setting:
C2/m
Cell Parameters:
a = 18.53(4) Å, b = 17.43(3) Å, c = 7.56(1) Å
β = 94.06(15)°
Ratio:
a:b:c = 1.063 : 1 : 0.434
Unit Cell Volume:
V 2436 ų
Z:
8
Morphology:
Spherulites; near-parallel or divergent aggregates of very thin, curved fibers.
Comment:
Space group C2, Cm or C2/m.
X-Ray Powder Diffraction Data:
d-spacingIntensity
12.66 (100)
7.60 (6)
5.00 (10)
4.70 (10)
4.33 (7)
3.215 (4)
3.151 (4)
2.887 (5)

Type Occurrence of Hilarionite

General Appearance of Type Material:
Spherulites (up to 1 mm in size) and bunches of prismatic to acicular «individuals» (up to 0.5 mm long) that are in fact near-parallel or divergent aggregates of very thin, curved fibers up to 0.3 mm long and usually lesser than 2 um thick.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, catalogue number 92988.
Geological Setting of Type Material:
In the oxidation zone of a sulfide-rich ore-body.
Empirical Formula:
(Fe3+1.90Cu0.0Zn0.01)1.92[(SO4)1.24(AsO4)0.74·(PO4)0.01]1.99(OH)1.01·6.03H2O

Other Names for Hilarionite

Name in Other Languages:

Other Information

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 Hilarionite

Reference List:
Pekov, I.V., Chukanov, N.V., Yapaskurt, V.O., Rusakov, V.S., Belakovskiy, D.I., Turchkova, A.G., Voudouris, P., Katerinopoulos, A. and Magganas, A. (2012) Hilarionite, IMA 2011-089. CNMNC Newsletter No. 12, February 2012, page 154; Mineralogical Magazine, 76, 151-155.

Pekov, I.V., Chukanov ,N.V., Yapaskurt, V.O., Rusakov, V.S., Belakovskiy, D.I., Turchkova, A.G., Vuduris, P., Magganas, A., Katerinopolus, A. (2013): Hilarionite, Fe3+2(SO4)(AsO4)(OH)•6H2O, a new hypergene mineral from Laurion, Greece. Zapiski RMO, 142(5), 30-42.

Internet Links for Hilarionite

mindat.org URL:
https://www.mindat.org/min-42410.html
Please feel free to link to this page.

Localities for Hilarionite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Greece (TL)
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Agios Konstantinos [St Constantine] (Kamariza)
          • Kamariza Mines (Kamareza Mines)
            • Hilarion area
Pekov, I.V., Chukanov, N.V., Yapaskurt, V.O., Rusakov, V.S., Belakovskiy, D.I., Turchkova, A.G., Voudouris, P., Katerinopoulos, A. and Magganas, A. (2012) Hilarionite, IMA 2011-089. CNMNC Newsletter No. 12, February 2012, page 154; Mineralogical Magazine, 76, 151-155; Pekov, I.V., Chukanov ,N.V., Yapaskurt, V.O., Rusakov, V.S., Belakovskiy, D.I., Turchkova, A.G., Vuduris, P., Magganas, A., Katerinopolus, A. (2013): Hilarionite, Fe3+2(SO4)(AsO4)(OH)•6H2O, a new hypergene mineral from Laurion, Greece. Zapiski RMO, 142(5), 30-42.
Mineral and/or Locality  
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