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Graeserite

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Passaic Pit (Marshall Mine; Passaic Mine), Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA
© SHMM

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Formula:
(Fe
3+
 
,Ti)
 
4
Ti
 
3
AsO
 
13
(OH)
System:MonoclinicColour:Black
Lustre:MetallicHardness:5½
Name:
For Prof. Dr. Stefan Graeser (1935-), in recognition of his extensive research on the oxides and sulfosalts of arsenic in the Binntal region of Switzerland.


The Fe3+ dominant analog of Tomichite and the As3+ dominant analog of Derbylite.

Classification of Graeserite

IMA status:Approved
Strunz 8th edition ID:4/C.23-15
Nickel-Strunz 10th (pending) edition ID:4.JB.55

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
B : Arsenites, antimonites, bismuthites; with additional anions, without H2O
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Type Occurrence of Graeserite

Type Locality:Gorb, Lercheltini (Lärcheltini) area, Binn Valley, Wallis (Valais), Switzerland
Geological Setting of type material:In hydrothermal veins in a two-mica paragneiss.

Occurrences of Graeserite

Geological Setting:Metamorphosed Precambrian calc-silicate gneissic rock in the footwall of a Zn-Fe-Mn orebody (Sterling Hill, NJ).

Physical Properties of Graeserite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Black
Streak:Black
Hardness (Mohs):5½
Fracture:Conchoidal

Crystallography of Graeserite

Crystal System:Monoclinic

Chemical Properties of Graeserite

Formula:
(Fe
3+
 
,Ti)
 
4
Ti
 
3
AsO
 
13
(OH)
Essential elements:As, Fe, H, O, Ti
All elements listed in formula:As, Fe, H, O, Ti

Relationship of Graeserite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.JB.05Fetiasite
(Fe
3+
 
,Fe
2+
 
,Ti)
 
3
(As
 
2
O
 
5
)O
 
2
4.JB.10Manganarsite
Mn
 
3
(As
 
2
O
 
4
)(OH)
 
4
4.JB.15Magnussonite
Mn
 
10
As
 
6
O
 
18
(OH,Cl)
 
2
4.JB.15UM1984-09-AsO:ClHMn
Mn
 
10
As
 
6
O
 
18
(OH)Cl
4.JB.20Armangite
Mn
2+
26
(AsO
 
3
)
 
14
(HAsO
 
3
)
 
4
(CO
 
3
)
4.JB.25Nanlingite
NaMg
 
4
(AsO
 
3
)
 
2
F
 
4
4.JB.30Asbecasite
Ca
 
3
(Ti,Sn
4+
 
)Be
 
2
(AsO
 
3
)
 
6
(SiO
 
4
)
 
2
4.JB.35Stenhuggarite
CaFeSb(AsO
 
3
)
 
2
O
4.JB.40Trigonite
Pb
 
3
Mn
2+
 
(AsO
 
3
)
 
2
(HAsO
 
3
)
4.JB.45Finnemanite
Pb
 
5
(AsO
 
3
)
 
3
Cl
4.JB.50Gebhardite
Pb
 
8
(As
 
2
O
 
5
)
 
2
OCl
 
6
4.JB.55Derbylite
Fe
3+
4
Ti
 
3
Sb
3+
 
O
 
13
(OH)
4.JB.55Tomichite
(V,Fe)
 
4
Ti
 
3
AsO
 
13
(OH)
4.JB.60Hemloite
(Ti,V
3+
 
,Fe
3+
 
,Al)
 
12
(As
3+
 
,Sb
3+
 
)
 
2
O
 
23
(OH)
4.JB.65Freedite
Cu
+
 
Pb
 
8
(AsO
 
3
)
 
2
O
 
3
Cl
 
5
4.JB.70Georgiadèsite
Pb
 
4
(AsO
 
3
)Cl
 
4
(OH)
4.JB.75Ekatite
(Fe
3+
 
,Fe
2+
 
,Zn)
 
12
(AsO
 
3
)
 
6
(AsO
 
3
,HSiO
 
4
)
 
2
(OH)
 
6

Other Names for Graeserite

Synonyms:
IMA1996-010
Other Languages:
German:Graeserit
Spanish:Graeserita

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.
Industrial Uses:None

References for Graeserite

Reference List:

- +
Krezemnicki, M.S. and Reusser, E. (1998) Graeserite, Fe3+4Ti3As3+O13(OH) a new mineral species of the derbylite group from from the Mount Leone Nappe, Binntal Region, Western Alps, Switzerland. Canadian Mineralogist: 36: 1083-1088.

Schweizerische mineralogische und petrographische Mitteilungen: 78: 1-9.

Verbeek, E., Orosz, J., and Nikischer, T. (2006) Mineral News: 22(9): 8-9.

Internet Links for Graeserite

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  • Raman and XRD data at RRUFF project
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    • Localities for Graeserite

    The 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.
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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.
    Switzerland
     
    • Wallis (Valais)
      • Binn Valley
        • Lercheltini (Lärcheltini) area
    		M.S. Krzemnicki & E. Reusser (1998): Graeserite, Fe4Ti3AsO13(OH), a new mineral species of the derbylite group from the Monte Leone nappe, Binntal, Western Alps, Switzerland.- Canadian Mineralogist 36, 1083-1088.
    USA
     
    • New Jersey
      • Sussex Co.
        • Franklin Mining District
          • Ogdensburg
            • Sterling Hill
    		Verbeek, E. et al (2006) Mineral News: 22(9): 8-9.
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