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Gerdtremmelite

Big Photo

Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia
© Brent Thorne

Show Gerdtremmelite Photos (3)
Formula:
(Zn,Fe)(Al,Fe)
 
2
AsO
 
4
(OH)
 
5
System:Triclinic
This page provides mineralogical data about Gerdtremmelite.

Classification of Gerdtremmelite

IMA status:Approved
Strunz 8th edition ID:7/B.16-10
Nickel-Strunz 10th (pending) edition ID:8.BE.40

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
E : With only medium-sized cations, (OH, etc.):RO4 > 2:1
Dana 8th edition ID:41.3.7.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
3 : (AB)3(XO4)Zq
Hey's CIM Ref.:20.4.10

20 : Arsenates (also arsenates with phosphate, but without other anions)
4 : Arsenates of Group III metals (Al, rare earths)
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Type Occurrence of Gerdtremmelite

Type Locality:Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia
Year of Discovery:1985

Crystallography of Gerdtremmelite

Crystal System:Triclinic
Cell Parameters:a = 5.16Å, b = 13.03Å, c = 4.93Å
α = 98.78°, β = 100.8°, γ = 78.73°
Ratio:a:b:c = 0.396 : 1 : 0.378
Unit Cell Volume:V 316.99 ų (Calculated from Unit Cell)

Optical Data of Gerdtremmelite

Type:Biaxial
RI values: nα = 1.730 - 1.740 nγ = 1.830 - 1.840
Maximum Birefringence:δ = 0.100

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

Chemical Properties of Gerdtremmelite

Formula:
(Zn,Fe)(Al,Fe)
 
2
AsO
 
4
(OH)
 
5
Essential elements:Al, As, H, O, Zn
All elements listed in formula:Al, As, Fe, H, O, Zn

Relationship of Gerdtremmelite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.BE.05Augelite
Al
 
2
[(OH)
 
3
|PO
 
4
]
8.BE.10Grattarolaite
Fe
3+
 
[O
 
3
|PO
 
4
]
8.BE.15Cornetite
Cu
 
3
[(OH)
 
3
|PO
 
4
]
8.BE.20Clinoclase
Cu
 
3
[(OH)
 
3
|AsO
 
4
]
8.BE.25Arhbarite
Cu
 
2
Mg[(OH)
 
3
|AsO
 
4
]
8.BE.25Gilmarite
Cu
 
3
[(OH)
 
3
|AsO
 
4
]
8.BE.30Allactite
Mn
2+
7
(AsO
 
4
)
 
2
(OH)
 
8
8.BE.30Flinkite
Mn
2+
2
Mn
3+
 
AsO
 
4
(OH)
 
4
8.BE.30Raadeite
Mg
 
7
(PO
 
4
)
 
2
(OH)
 
8
8.BE.35Chlorophoenicite
(Mn,Mg)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
8.BE.35Magnesiochlorophoenicite
(Mg,Mn)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
8.BE.45Dixenite
CuMn
2+
14
Fe
2+
 
[(OH)
 
6
|(AsO
 
3
)
 
5
|AsO
 
4
|(SiO
 
4
)
 
2
]
8.BE.45Hematolite
(Mn,Mg,Al)
 
15
(AsO
 
3
)(AsO
 
4
)
 
2
(OH)
 
23
8.BE.45Kraisslite
(Mn
2+
 
,Mg)
 
24
Zn
 
4
[(OH)
 
12
|(AsO
 
4
)
 
4
|(SiO
 
4
)
 
8
]
8.BE.45Mcgovernite
(Mn,Mg,Zn)
 
273
As
3+
~12
As
5+
~30
Si
 
~42
O
 
324
(OH)
 
252
8.BE.45Arakiite
(Zn,Mn
2+
 
)(Mn
2+
 
,Mg)
 
12
(Fe
3+
 
,Al)
 
2
(AsO
 
3
)(AsO
 
4
)
 
2
(OH)
 
23
8.BE.45Turtmannite
(Mn,Mg)
 
22.5
Mg
 
3-3x
[(V,As)O
 
4
]
 
3
[SiO
 
4
]
 
3
[AsO
 
3
]
 
x
O
 
5-5x
(OH)
 
20+x
8.BE.50Synadelphite
Mn
2+
9
[(OH)
 
9
|As
3+
 
O
 
3
|(As
5+
 
O
 
4
)
 
2
] · 2H
 
2
O
8.BE.55Holdenite
(Mn
2+
 
,Mg)
 
6
Zn
 
3
[(OH)
 
8
|(AsO
 
4
)
 
2
|SiO
 
4
]
8.BE.60Kolicite
Mn
2+
7
Zn
 
4
[(OH)
 
8
|(AsO
 
4
)
 
2
|(SiO
 
4
)
 
2
]
8.BE.65Sabelliite
(Cu,Zn)
 
2
Zn[(OH)
 
3
|(AsO
 
4
,SbO
 
4
)]
8.BE.70Jarosewichite
Mn
 
3
MnAsO
 
4
(OH)
 
6
8.BE.75Theisite
Cu
 
5
Zn
 
5
[(OH)
 
7
|(AsO
 
4
,SbO
 
4
)]
 
2
8.BE.80Coparsite
Cu
 
4
[O
 
2
|Cl|(AsO
 
4
,VO
 
4
)]
8.BE.85Waterhouseite
Mn
2+
7
[(OH)
 
8
|(PO
 
4
)
 
2
]
Related Minerals - Hey's Index Grouping:

- +
20.4.1Mansfieldite
AlAsO
 
4
·2H
 
2
O
20.4.2Bulachite
Al
 
2
[(OH)
 
3
|AsO
 
4
] · 3H
 
2
O
20.4.3Alumopharmacosiderite
KAl
 
4
[(OH)
 
4
|(AsO
 
4
)
 
3
] · 6-7H
 
2
O
20.4.4Luetheite
Cu
 
2
Al
 
2
[(OH)
 
2
|AsO
 
4
]
 
2
20.4.5Arsenogoyazite
SrAl
 
3
[(OH)
 
5
|(AsO
 
4
)
 
2
] · H
 
2
O
20.4.6Arsenocrandallite
(Ca,Sr)Al
 
3
[(OH)
 
5
|(AsO
 
4
,PO
 
4
)
 
2
] · H
 
2
O
20.4.7Arsenoflorencite-(Ce)
CeAl
 
3
[(OH)
 
6
|(AsO
 
4
)
 
2
]
20.4.8Arsenoflorencite-(La)
LaAl
 
3
[(OH)
 
6
|(AsO
 
4
)
 
2
]
20.4.9Arsenoflorencite-(Nd)
NdAl
 
3
[(OH)
 
6
|(AsO
 
4
)
 
2
]
20.4.11Gasparite-(Ce)
(Ce,REE)AsO
 
4
20.4.12Chernovite-(Y)
YAsO
 
4
20.4.13Agardite-(Y)
(Y,Ca)Cu
 
6
[(OH)
 
6
|(AsO
 
4
,HAsO
 
4
)|(AsO
 
4
)
 
2
] · 3H
 
2
O
20.4.14Agardite-(La)
(La,Ce)Cu
 
6
[(OH)
 
6
|(AsO
 
4
)
 
3
] · 3H
 
2
O
20.4.15Goudeyite
(Al,Y)Cu
 
6
[(OH)
 
6
|(AsO
 
4
)
 
3
] · 3H
 
2
O
20.4.16Retzian-(Ce)
Mn
2+
2
Ce(AsO
 
4
)(OH)
 
4
20.4.17Retzian-(La)
(Mn
2+
 
,Mg)
 
2
(La,Ce,Nd)(AsO
 
4
)(OH)
 
4
20.4.18Retzian-(Nd)
Mn
2+
2
(Nd,Ce,La)(AsO
 
4
)(OH)
 
4

Other Names for Gerdtremmelite

Synonyms:
IMA1983-049a
Other Languages:
German:Gerdtremmelit
Spanish:Gerdtremmelita

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 Gerdtremmelite

Reference List:American Mineralogist: 71: 845.

Articles/Blogs about Gerdtremmelite

Internet Links for Gerdtremmelite

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    Localities for Gerdtremmelite

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    (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.
    Namibia
     
    • Otjikoto (Oshikoto) Region
      • Tsumeb
    		[Neues Jahrb.Min.,Mh.(1985) 1-6; MinRec 31:204]
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