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About GraeseriteHide

Stefan Graeser
also given as Fe2+/sup>xFe3+4-2xTi4+3+xAs3+O13(OH)
Crystal System:
Named in 1998 by M. S. Krezemnicki and E. Reusser in honor of Dr. Stefan Graeser (1935-), professor at the Mineralogical-Petrographic Institute, University of Basel, Switzerland 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.

Its relation with derbylite is homeotypic; both crystallize in the same point group, but different space group.

Classification of GraeseriteHide


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

Physical Properties of GraeseriteHide

5½ on Mohs scale

Chemical Properties of GraeseriteHide


also given as Fe2+/sup>xFe3+4-2xTi4+3+xAs3+O13(OH)
IMA Formula:

Crystallography of GraeseriteHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 5.0225(7) Å, b = 14.3114(18) Å, c = 7.1743(9) Å
β = 104.878(3)°
a:b:c = 0.351 : 1 : 0.501
Unit Cell V:
498.39 ų
example, Biagoni et al. (2020)

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0015412GraeseriteBerlepsch P, Armbruster T (1998) The crystal structure of Pb2+-bearing graeserite, Pb0.14(Fe,Ti)7AsO12+x(OH)2-x, a mineral of the derbylite group Schweizerische Mineralogische und Petrographische Mitteilungen 78 1-91998Gorb, Binn valley, Western Alps, Switzerland0293
CIF Raw Data - click here to close

Geological EnvironmentHide

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

Type Occurrence of GraeseriteHide

Geological Setting of Type Material:
In hydrothermal veins in a two-mica paragneiss.

Synonyms of GraeseriteHide

Other Language Names for GraeseriteHide


Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Graeserite associated with Fetiasite(Fe3+,Fe2+,Ti)3(As2O5)O2
3 photos of Graeserite associated with QuartzSiO2
2 photos of Graeserite associated with Chlorite Group
1 photo of Graeserite associated with CalciteCaCO3
1 photo of Graeserite associated with ClinochloreMg5Al(AlSi3O10)(OH)8
1 photo of Graeserite associated with RutileTiO2
1 photo of Graeserite associated with AdulariaKAlSi3O8
1 photo of Graeserite associated with HematiteFe2O3

Related Minerals - Nickel-Strunz GroupingHide

4.JB.15MagnussoniteMn10As6O18(OH,Cl)2Iso. m3m (4/m 3 2/m) : Ia3d
4.JB.15UM1984-09-AsO:ClHMnMn10As6O18(OH)ClTet. 4/mmm (4/m 2/m 2/m) : I41/acd
4.JB.20ArmangiteMn2+26(AsO3)14(HAsO3)4(CO3)Trig. 3 : P3
4.JB.30AsbecasiteCa3(Ti,Sn4+)Be2(AsO3)6(SiO4)2Trig. 3m : P3c1
4.JB.40TrigonitePb3Mn2+(AsO3)2(HAsO3)Mon. m
4.JB.45FinnemanitePb5(AsO3)3ClHex. 6/m : P63/m
4.JB.50GebharditePb8(As2O5)2OCl6Mon. 2/m : P21/b
4.JB.55DerbyliteFe3+4Ti3Sb3+O13(OH)Mon. 2/m : P21/m
4.JB.55Tomichite(V,Fe)4Ti3AsO13(OH)Mon. 2/m : P21/m
4.JB.60Hemloite(Ti,V3+,Fe3+,Al)12(As3+,Sb3+)2O23(OH)Tric. 1 : P1
4.JB.65FreediteCu+Pb8(AsO3)2O3Cl5Mon. 2/m : B2/m

Other InformationHide

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

References for GraeseriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Biagioni, C., Bonaccorsi, E., Perchiazzi, N., Hålenius, U., Zaccarini, F. (2020): Derbylite and graeserite from the Monte Arsiccio mine (Apuan Alps, Tuscany, Italy): occurrence and crystal-chemistry. Mineralogical Magazine: 84 (in press);

Internet Links for GraeseriteHide

Localities for GraeseriteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Tuscany
    • Lucca Province
      • Stazzema
        • Sant'Anna di Stazzema
Collection Lechner Alois
Switzerland (TL)
  • Valais
    • Goms
      • Binn
        • Lärchultini
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.
  • New Jersey
    • Sussex County
      • Franklin Mining District
        • Ogdensburg
          • Sterling Hill
Verbeek, E. et al (2006) Mineral News: 22(9): 8-9.
Mineral and/or Locality  
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