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Graeserite

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Stefan Graeser
Formula:
Fe43+Ti3As3+O13(OH)
System:
Monoclinic
Colour:
Black
Lustre:
Metallic
Hardness:
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.


Classification of Graeserite

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 Graeserite

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

Chemical Properties of Graeserite

IMA Formula:
Fe43+Ti3As3+O13(OH)
Elements listed in formula:

Crystallography of Graeserite

Crystal System:
Monoclinic

Occurrences of Graeserite

Type Occurrence of Graeserite

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

Relationship of Graeserite to other Species

4.JB.05Fetiasite(Fe2+,Fe3+,Ti4+)3O2As23+O5
4.JB.10ManganarsiteMn32+As23+O4(OH)4
4.JB.15MagnussoniteMn102+As63+O18(OH,Cl)2
4.JB.15UM1984-09-AsO:ClHMnMn10As6O18(OH)Cl
4.JB.20ArmangiteMn262+As183+O50(CO3)(OH)4
4.JB.25NanlingiteNaCa5LiMg12(AsO3)2[Fe2+(AsO3)6]F14
4.JB.30AsbecasiteCa3TiAs6Be2Si2O20
4.JB.35StenhuggariteCaFe3+Sb3+As23+O7
4.JB.40TrigonitePb3Mn2+(As3+O3)2(As3+O2OH)
4.JB.45FinnemanitePb5(As3+O3)3Cl
4.JB.50GebharditePb8As43+O11Cl6
4.JB.55DerbyliteFe43+Ti34+Sb3+O13(OH)
4.JB.55TomichiteV43+Ti34+As3+O13(OH)
4.JB.60Hemloite(Ti,V3+,Fe3+,Al)12As23+O23(OH)
4.JB.65FreediteCu1+Pb8(As3+O3)2O3Cl5
4.JB.70GeorgiadèsitePb4(As3+O3)Cl4(OH)
4.JB.75Ekatite(Fe3+,Fe2+,Zn)12(AsO3)6(AsO3,SiO3OH)2(OH)6

Other Names for Graeserite

Name in Other Languages:
German:Graeserit
Spanish:Graeserita

Other Information

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 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

mindat.org URL:
https://www.mindat.org/min-6977.html
Please feel free to link to this page.

Localities for Graeserite

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.
(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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