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Graeserite

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Stefan Graeser
Formula:
(Fe3+ ,Ti)4Ti3AsO13(OH)
Colour:
Black
Lustre:
Metallic
Hardness:
Crystal System:
Monoclinic
Name:
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.


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Classification of GraeseriteHide

Approved
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

Physical Properties of GraeseriteHide

Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
5½ on Mohs scale
Fracture:
Conchoidal

Chemical Properties of GraeseriteHide

Formula:
(Fe3+ ,Ti)4Ti3AsO13(OH)
IMA Formula:
Fe3+4Ti3As3+O13(OH)

Crystallography of GraeseriteHide

Crystal System:
Monoclinic

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

German:Graeserit
Spanish:Graeserita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Fetiasite3 photos of Graeserite associated with Fetiasite on mindat.org.
Quartz3 photos of Graeserite associated with Quartz on mindat.org.
Chlorite Group2 photos of Graeserite associated with Chlorite Group on mindat.org.
Calcite1 photo of Graeserite associated with Calcite on mindat.org.
Clinochlore1 photo of Graeserite associated with Clinochlore on mindat.org.
Rutile1 photo of Graeserite associated with Rutile on mindat.org.
Adularia1 photo of Graeserite associated with Adularia on mindat.org.
Hematite1 photo of Graeserite associated with Hematite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.JB.05Fetiasite(Fe3+,Fe2+,Ti)3(As2O5)O2Mon.
4.JB.10ManganarsiteMn3(As2O4)(OH)4
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.25NanlingiteNa(Ca5Li)Mg12(AsO3)2[Fe(AsO3)6]F14Trig.
4.JB.30AsbecasiteCa3(Ti,Sn4+)Be2(AsO3)6(SiO4)2Trig. 3m : P3c1
4.JB.35StenhuggariteCaFeSb(AsO3)2OTet.
4.JB.40TrigonitePb3Mn2+(AsO3)2(HAsO3)Mon. m
4.JB.45FinnemanitePb5(AsO3)3ClHex. 6/m : P63/m
4.JB.50GebharditePb8(As2O5)2OCl6Mon.
4.JB.55DerbyliteFe3+4Ti3Sb3+O13(OH)Mon. 2/m : P21/m
4.JB.55Tomichite(V,Fe)4Ti3AsO13(OH)Mon.
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
4.JB.70GeorgiadèsitePb4(AsO3)Cl4(OH)Mon.
4.JB.75Ekatite(Fe3+,Fe2+,Zn)12(AsO3)6(AsO3,HSiO4)2(OH)6Hex.

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:
None

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.

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

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Italy
 
  • Tuscany
    • Lucca Province
      • Apuan Alps
        • Stazzema
          • Sant'Anna di Stazzema
Collection Lechner Alois
Switzerland (TL)
 
  • Wallis (Valais)
    • Binn Valley
      • Lercheltini area (Lärcheltini)
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.
Mineral and/or Locality  
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