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Irhtemite

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Ightem Mine (Irhtem Mine), Ightem, Bou Azzer District, Tazenakht, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco
© Knut Eldjarn

Show Irhtemite Photos (7)
Formula:
Ca
 
4
Mg[(HAsO
 
4
)
 
2
|(AsO
 
4
)
 
2
] · 4H
 
2
O
System:Monoclinic
This page provides mineralogical data about Irhtemite.

Classification of Irhtemite

IMA status:Approved
Strunz 8th edition ID:7/C.24-30
Nickel-Strunz 10th (pending) edition ID:8.CB.10

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
B : With only medium-sized cations, RO4:H2O = 1:1
Dana 8th edition ID: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
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Type Occurrence of Irhtemite

Type Locality:Ightem Mine (Irhtem Mine), Ightem, Bou Azzer District, Tazenakht, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco
Year of Discovery:1972

Crystallography of Irhtemite

Crystal System:Monoclinic
Cell Parameters:a = 16.73Å, b = 9.48Å, c = 10.84Å
β = 97.25°
Ratio:a:b:c = 1.765 : 1 : 1.143
Unit Cell Volume:V 1,705.48 ų (Calculated from Unit Cell)

Optical Data of Irhtemite

Type:Biaxial (+)
RI values: nα = 1.634 nγ = 1.642
Maximum Birefringence:δ = 0.008

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:strong

Chemical Properties of Irhtemite

Formula:
Ca
 
4
Mg[(HAsO
 
4
)
 
2
|(AsO
 
4
)
 
2
] · 4H
 
2
O
Essential elements:As, Ca, H, Mg, O
All elements listed in formula:As, Ca, H, Mg, O

Relationship of Irhtemite to other Species

Related Minerals - Nickel-Strunz Grouping):
8.CB.05Serrabrancaite
MnPO
 
4
·H
 
2
O
8.CB.10Hureaulite
(Mn,Fe)
 
5
H
 
2
(PO
 
4
)
 
4
·4H
 
2
O
8.CB.10Sainfeldite
Ca
 
5
H
 
2
(AsO
 
4
)
 
4
·4H
 
2
O
8.CB.10Villyaellenite
(Mn,Ca,Zn)
 
5
(AsO
 
4
)
 
2
[AsO
 
3
(OH)]
 
2
·4H
 
2
O
8.CB.15Fluckite
CaMnH
 
2
(AsO
 
4
)
 
2
·2H
 
2
O
8.CB.15Krautite
MnHAsO
 
4
·H
 
2
O
8.CB.20Cobaltkoritnigite
(Co,Zn)[HAsO
 
4
] · H
 
2
O
8.CB.20Koritnigite
Zn[HAsO
 
4
] · H
 
2
O
8.CB.25Yvonite
Cu[HAsO
 
4
] · 2H
 
2
O
8.CB.30Geminite
Cu
 
2
[As
 
2
O
 
7
] · 3H
 
2
O
8.CB.35Schubnelite
Fe
 
2-x
V
 
2
O
 
4
(OH)
 
4
8.CB.40Radovanite
Cu
 
2
Fe
3+
 
[(As
3+
 
O
 
2
(OH)]
 
2
[As
5+
 
O
 
4
]·H
 
2
O
8.CB.45Kazakhstanite
Fe
 
5
V
 
3
V
 
12
O
 
39
(OH)
 
9
·9H
 
2
O
8.CB.50Kolovratite
(Zn,Ni,Cu)
 
2-5
Al
 
4-6
(Si,V
4+
 
,V
5+
 
)
 
4
(O,OH)
 
20
·7.5H
 
2
O
Related Minerals - Hey's Index Grouping:
20.2.1Bearsite
Be
 
2
[OH|AsO
 
4
] · 4H
 
2
O
20.2.2Brassite
MgHAsO
 
4
·4H
 
2
O
20.2.3Rösslerite
MgHAsO
 
4
·7H
 
2
O
20.2.4Hörnesite
Mg
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
20.2.5Weilite
CaHAsO
 
4
20.2.6Johnbaumite
Ca
 
5
[OH|(AsO
 
4
)
 
3
]
20.2.7Haidingerite
Ca[HAsO
 
4
] · H
 
2
O
20.2.8Pharmacolite
CaHAsO
 
4
·2H
 
2
O
20.2.9Sainfeldite
Ca
 
5
H
 
2
(AsO
 
4
)
 
4
·4H
 
2
O
20.2.10Vladimirite
Ca
 
5
[(HAsO
 
4
)
 
2
|(AsO
 
4
)
 
2
] · 5H
 
2
O
20.2.11Guérinite
Ca
 
5
[(HAsO
 
4
)
 
2
|(AsO
 
4
)
 
2
] · 9H
 
2
O
20.2.12Ferrarisite
Ca
 
5
[(HAsO
 
4
)
 
2
|(AsO
 
4
)
 
2
] · 9H
 
2
O
20.2.13Rauenthalite
Ca
 
3
[AsO
 
4
]
 
2
 · 10H
 
2
O
20.2.14Phaunouxite
Ca
 
3
[AsO
 
4
]
 
2
 · 11H
 
2
O
20.2.15Mcnearite
NaCa
 
5
[(HAsO
 
4
)
 
4
|AsO
 
4
] · 4H
 
2
O
20.2.16Bergslagite
CaBe[OH|AsO
 
4
]
20.2.17Adelite
CaMg[AsO
 
4
](OH)
20.2.18Talmessite
Ca
 
2
Mg[AsO
 
4
]
 
2
 · 2H
 
2
O
20.2.20Camgasite
CaMg[OH|AsO
 
4
] · 5H
 
2
O
20.2.21Picropharmacolite
Ca
 
4
Mg[(HAsO
 
4
)
 
2
|(AsO
 
4
)
 
2
] · 11H
 
2
O
20.2.22Bariopharmacosiderite
BaFe
3+
4
[(OH)
 
5
|(AsO
 
4
)
 
3
] · 5H
 
2
O

Other Names for Irhtemite

Synonyms:
IMA1971-034
German names:
Irhtemit
Spanish names:
Irhtemita

Other Information

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

References for Irhtemite

Reference List:American Mineralogist: 59: 209.

Bulletin de la Société française de Minéralogie et de Cristallographie (1972): 95: 365-370.

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Internet Links for Irhtemite

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    Localities for Irhtemite

    (TL) indicates type locality. ? 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.
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Karlovy Vary Region
        • Krušné Hory Mts (Erzgebirge)
          • Ostrov
    		Lapis 2002(7/8), 63-65
    France
     
    • Provence-Alpes-Côte d'Azur
      • Alpes-Maritimes
    		Cuchet S. (2000), Mystérieuse irhtémite à Lucéram, Alpes-Maritimes, Le Règne Minéral, n°36, pp: 38-42
    Germany
     
    • Hesse
      • North Hesse
        • Richelsdorf District
          • Bauhaus
    		Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
          • Süss
            • Richelsdorf Smelter
    		S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1992
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
        • Tazenakht
          • Bou Azzer District
            • Bou Azzer
    		Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
            • Ightem
    USA
     
    • Utah
      • Tooele Co.
        • Oquirrh Mts
          • Mercur District (Camp Floyd District)
    		Mineral News: 19(12): 1, 3.
    Mineral and/or Locality
    Google
     
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