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Irhtemite

A valid IMA mineral species
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Irhtemite

Ightem Mine, Ightem, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco
06526460014959578139138.jpg
Irhtemite

Mercur Mine, Mercur Mining District, Tooele County, Utah, USA
04103590014971985611451.jpg
Irhtemite

Ightem Mine, Ightem, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco
04316410014947133216192.jpg
Irhtemite

Ightem Mine, Ightem, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco
00156730014946275173869.jpg
Irhtemite

Mercur Mine, Mercur Mining District, Tooele County, Utah, USA
05612010014947133218197.jpg
Irhtemite

Ightem Mine, Ightem, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco
08170290014948360607197.jpg
Irhtemite

Ightem Mine, Ightem, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco
06526460014959578139138.jpg
Irhtemite

Mercur Mine, Mercur Mining District, Tooele County, Utah, USA
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About IrhtemiteHide

09007370014947923472006.jpg
the dump

Ightem Mine, Ightem, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco
Formula:
Ca4Mg(AsO4)2(HAsO4)2 · 4H2O
Colour:
Colorless, white, pale rose
Lustre:
Silky
Specific Gravity:
3.09
Crystal System:
Monoclinic
Name:
Named after the type locality, the Ightem Mine (Irhtem Mine).
This page provides mineralogical data about Irhtemite.


Unique IdentifiersHide

Mindat ID:
2043
Long-form identifier:
mindat:1:1:2043:1
GUID
(UUID V4):
2197109b-7874-442a-b386-1af78c562b00

IMA Classification of IrhtemiteHide

Classification of IrhtemiteHide

Strunz-mindat (2024):
8.CG.55

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
Dana 8th ed.:
39.2.5.1

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
Hey's CIM Ref.:
20.2.19

20 : Arsenates (also arsenates with phosphate, but without other anions)
2 : Arsenates of Be, Mg, Ca or Ba

Mineral SymbolsHide

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

SymbolSourceReference
IrhIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of IrhtemiteHide

Lustre:
Silky
Transparency:
Transparent
Colour:
Colorless, white, pale rose
Streak:
White
Density:
3.09 g/cm3 (Measured)    3,153 g/cm3 (Calculated)

Optical Data of IrhtemiteHide

Type:
Biaxial (+)
RI values:
nα = 1.634 nγ = 1.642
Max Birefringence:
δ = 0.008
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
strong
Optical Extinction:
Extinction angle 25°.
Comments:
Elongation negative.

Chemistry of IrhtemiteHide

Mindat Formula:
Ca4Mg(AsO4)2(HAsO4)2 · 4H2O
Elements listed:
As, Ca, H, Mg, O - search for minerals with similar chemistry

Crystallography of IrhtemiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 16.736(5) Å, b = 9.483(3) Å, c = 10.840(5) Å
β = 97.25°
Ratio:
a:b:c = 1.765 : 1 : 1.143
Unit Cell V:
1,706.63 ų (Calculated from Unit Cell)
Z:
4
Comment:
Point Group: n.d.; Space Group: n.d.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.42 Å(30)
6.85 Å(30)
5.08 Å(40)
3.68 Å(40)
3.24 Å(90)
2.97 Å(100)
2.82 Å(90)
Comments:
Ightem Mine, Morocco. Data from the type description.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47d : [Arsenates, antimonates, selenates, bismuthinates]

Type Occurrence of IrhtemiteHide

Type Locality:
ⓘ Ightem Mine (Irhtem Mine), Ightem, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco
General Appearance of Type Material:
Spherulites 0.5-1 mm in diameter.
Place of Conservation of Type Material:
National School of Mines, Paris, France.
Geological Setting of Type Material:
Dehydration product of picropharmacolite in hydrothermal veins.
Associated Minerals at Type Locality:
SainfelditeErythrite
Reference:
Pierrot R, Schubnel H J (1972) L'irhtemite, un nouvel arséniate hydraté de calcium et magnésium. Bulletin de la Société Française de Minéralogie et de Cristallographie 95, 365-370

Synonyms of IrhtemiteHide

Other Language Names for IrhtemiteHide

German:Irhtemit
Spanish:Irhtemita

Common AssociatesHide

Associated Minerals Based on Photo Data:
7 photos of Irhtemite associated with CalciteCaCO3
7 photos of Irhtemite associated with VladimiriteCa4(AsO4)2(AsO3OH) · 4H2O

Related Minerals - Strunz-mindat GroupingHide

8.CG.Ca-HuréauliteCaMn5(PO4)4 · 4H2O
8.CG.FluckiteCaMn2+(AsO3OH)2 · 2H2OTric. 1 : P1
8.CG.DondoelliteCa2Fe(PO4)2 · 2H2OTric. 1 : P1
8.CG.AlumolukrahniteCa[CuAl](AsO4)2(H2O,OH)2Tric. 1 : P1
8.CG.05CassidyiteCa2Ni(PO4)2 · 2H2OTric.
8.CG.05CollinsiteCa2Mg(PO4)2 · 2H2OTric. 1 : P1
8.CG.05FairfielditeCa2Mn2+(PO4)2 · 2H2OTric. 1 : P1
8.CG.05GaititeCa2Zn(AsO4)2 · 2H2OTric. 1 : P1
8.CG.05MesseliteCa2Fe2+(PO4)2 · 2H2OTric. 1 : P1
8.CG.05ParabrandtiteCa2Mn2+(AsO4)2 · 2H2OTric. 1 : P1
8.CG.05AnorthoroseliteCa2Co(AsO4)2 · 2H2OTric.
8.CG.05TalmessiteCa2Mg(AsO4)2 · 2H2OTric. 1 : P1
8.CG.05HilliteCa2Zn(PO4)2 · 2H2OTric. 1 : P1
8.CG.05Unnamed (Fe2+-analogue of Parabrandtite)Ca2Fe2+(AsO4)2 · 2H2O
8.CG.10BrandtiteCa2Mn2+(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10RoseliteCa2Co(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10WendwilsoniteCa2Mg(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10ZincroseliteCa2Zn(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10RruffiteCa2Cu(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10Unnamed (Fe2+-analogue of Brandtite)Ca2Fe2+(AsO4)2 · 2H2O
8.CG.15FerrilotharmeyeriteCaZnFe3+(AsO4)2(OH) · H2OMon. 2/m : B2/m
8.CG.15LotharmeyeriteCaZn2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15MawbyitePbFe3+2(AsO4)2(OH)2Mon. 2/m : B2/m
8.CG.15MounanaitePbFe3+2(VO4)2(OH,F)2Mon. 2/m : B2/m
8.CG.15ThometzekitePbCu2+2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15TsumcoritePbZn2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15CobaltlotharmeyeriteCaCo2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15CabalzariteCaMg2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15KrettnichitePbMn3+2(VO4)2(OH)2Mon. 2/m : B2/m
8.CG.15CobalttsumcoritePbCo2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15NickellotharmeyeriteCaNi2(AsO4)2 · 2H2OMon. 2/m : B2/m
8.CG.15ManganlotharmeyeriteCaMn3+2(AsO4)2(OH)2Mon. 2/m : B2/m
8.CG.15SchneebergiteBiCo2(AsO4)2(OH) · H2OMon. 2/m : B2/m
8.CG.15NickelschneebergiteBiNi2(AsO4)2(OH) · H2OMon. 2/m : B2/m
8.CG.15YancowinnaitePbCuAl(AsO4)2OH · H2O Tric. 1 : P1
8.CG.15NickeltsumcoritePb(Ni,Fe3+)2(AsO4)2(H2O,OH)2Mon. 2/m : B2/m
8.CG.15MagnesiofluckiteCaMg(AsO3OH)2(H2O)2Tric. 1 : P1
8.CG.20GartrellitePbCuFe3+(AsO4)2(OH) · H2OTric. 1 : P1
8.CG.20HelmutwinkleritePbZn2(AsO4)2 · 2H2OTric. 1 : P1
8.CG.20ZincgartrellitePbZn2(AsO4)2(H2O,OH)2Tric. 1 : P1
8.CG.20RappolditePbCo2(AsO4)2 · 2H2OTric. 1 : P1
8.CG.20PhosphogartrellitePbCuFe3+(PO4)2(OH,H2O)2Tric. 1 : P1
8.CG.20LukrahniteCaCuFe3+(AsO4)2(OH,H2O)2Tric. 1 : P1
8.CG.25Pottsite(Pb3xBi4-2x)(VO4)4 · H2O (0.8 < x < 1.0)Tet. 4/m : I41/a
8.CG.25Armellinoite-(Ce)Ca4Ce4+(AsO4)4 · H2OTet. 4/m : I41/a
8.CG.35NickeltalmessiteCa2Ni(AsO4)2 · 2H2OTric. 1 : P1

Other InformationHide

Thermal Behaviour:
DTA curve shows an endothermic break at 300° and an exothermic break at 730°.
Notes:
Dissolved by dilute acids.
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 IrhtemiteHide

References for IrhtemiteHide

Localities for IrhtemiteHide

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 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.
Czech Republic
 
  • Karlovy Vary Region
    • Karlovy Vary District
Lapis 2002 (7/8)
France
 
  • Provence-Alpes-Côte d'Azur
    • Alpes-Maritimes
      • Nice
Cuchet (2000)
Germany
 
  • Hesse
    • Kassel Region
      • Hersfeld-Rotenburg
        • Nentershausen
          • Süß
            • Richelsdorf Smelter
Weiß (1990)
Weiß (1990)
Greece
 
  • Attica
    • East Attica
      • Lavreotiki
Rieck et al. (2020)
          • Plaka
            • Plaka Mines
Rieck et al. (2020)
Morocco
 
  • Drâa-Tafilalet Region
    • Ouarzazate Province
      • Amerzgane Cercle
        • Ouisselsate Caïdat
          • Bou Azzer Mine
Favreau et al. (2006)
    • Zagora Province
      • Agdz Cercle
        • Tansifte Caïdat
          • Ightem
American Mineralogist: 59: 209
USA
 
  • Utah
    • Tooele County
      • Mercur Mining District
Mineral News: 19 (12)
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