Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Geigerite

This page is currently not sponsored. Click here to sponsor this page.
Thomas Geiger (1920 - 1990)
Formula:
Mn52+(AsO4)2(HAsO4)2 · 10H2O
System:
Triclinic
Hardness:
3
Name:
Named after Dr. Thomas Geiger (1920 - 1990), Swiss mineralogist and metallurgist in the machinery industry and specialist for the manganese ores and minerals of Falotta and Alp Parsettens to which he devoted his PhD thesis and a series of later studies.
The manganese analogue of chudobaite.

Classification of Geigerite

Approved 1985
8.CE.05

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
39.2.6.2

39 : HYDRATED ACID PHOSPHATES,ARSENATES AND VANADATES
2 : (AB)5[HXO4]2[XO4]2.xH2O
20.8.10

20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn
mindat.org URL:
http://www.mindat.org/min-1669.html
Please feel free to link to this page.

First Recorded Occurrence of Geigerite

Year of Discovery:
1985

Physical Properties of Geigerite

Hardness (Mohs):
3

Crystallography of Geigerite

Crystal System:
Triclinic
Cell Parameters:
a = 7.94Å, b = 10.69Å, c = 6.77Å
α = 80.97°, β = 84.2°, γ = 81.85°
Ratio:
a:b:c = 0.743 : 1 : 0.633
Unit Cell Volume:
V 560.3 ų
X-Ray Powder Diffraction Data:
d-spacingIntensity
10.45 (100)
7.85 (13)
3.507 (21)
3.340 (20)
3.051 (24)
3.011 (17)
2.786 (14)

Optical Data of Geigerite

Type:
Biaxial (-)
RI values:
nα = 1.601 nβ = 1.630 nγ = 1.660
2V:
Measured: 89° , Calculated: 88°
Max Birefringence:
δ = 0.059
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none

Chemical Properties of Geigerite

Formula:
Mn52+(AsO4)2(HAsO4)2 · 10H2O
Essential elements:
All elements listed in formula:

Relationship of Geigerite to other Species

Other Members of Group:
Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2O
KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2O
OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2O
8.CE.05Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2O
8.CE.10NewberyiteMg(HPO4) · 3H2O
8.CE.15BrassiteMg(HAsO4) · 4H2O
8.CE.20PhosphorrössleriteMg(HPO4) · 7H2O
8.CE.20RössleriteMg(HAsO4) · 7H2O
8.CE.25MetaswitzeriteMn3(PO4)2 · 4H2O
8.CE.25Switzerite(Mn,Fe)3(PO4)2 · 7H2O
8.CE.30LindackeriteCuCu4(AsO4)2(HAsO4)2 · 8-9H2O
8.CE.30OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2O
8.CE.30VeselovskýiteZnCu4(AsO4)2(HAsO4)2 · 9H2O
8.CE.30PradetiteCoCu4(AsO4)2(HAsO4)2 · 9H2O
8.CE.30KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2O
8.CE.35BobierriteMg3(PO4)2 · 8H2O
8.CE.40AnnabergiteNi3(AsO4)2 · 8H2O
8.CE.40ArupiteNi3(PO4)2 · 8H2O
8.CE.40Barićite(Mg,Fe)3(PO4)2 · 8H2O
8.CE.40ErythriteCo3(AsO4)2 · 8H2O
8.CE.40FerrisymplesiteFe33+(AsO4)2(OH)3 · 5H2O
8.CE.40HörnesiteMg3(AsO4)2 · 8H2O
8.CE.40KöttigiteZn3(AsO4)2 · 8H2O
8.CE.40Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2O
8.CE.40ParasymplesiteFe32+(AsO4)2 · 8H2O
8.CE.40VivianiteFe32+(PO4)2 · 8H2O
8.CE.40PakhomovskyiteCo3(PO4)2 · 8H2O
8.CE.45SymplesiteFe32+(AsO4)2 · 8H2O
8.CE.50CattiiteMg3(PO4)2 · 22H2O
8.CE.55KoninckiteFe3+PO4 · 3H2O
8.CE.60KaňkiteFeAsO4 · 3.5H2O
8.CE.65SteigeriteAl(VO4) · 3H2O
8.CE.70MetaschoderiteAl2(PO4)(VO4) · 6H2O
8.CE.70SchoderiteAl2(PO4)(VO4) · 8H2O
8.CE.75MalhmooditeFeZr(PO4)2 · 4H2O
8.CE.75ZigrasiteMgZr(PO4)2 · 4H2O
8.CE.75Unnamed (Ca-analogue of Zigrasite)CaZr[PO4]2 · 4H2O
8.CE.80SantabarbaraiteFe33+(PO4)2(OH)3 · 5H2O
8.CE.85Metaköttigite(Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH)
20.8.1SarkiniteMn22+(AsO4)(OH)
20.8.2EveiteMn22+(AsO4)(OH)
20.8.3ArsenoclasiteMn52+(AsO4)2(OH)4
20.8.4FlinkiteMn22+Mn3+(AsO4)(OH)4
20.8.5JarosewichiteMn32+Mn3+(AsO4)(OH)6
20.8.6AllactiteMn72+(AsO4)2(OH)8
20.8.7KrautiteMn(HAsO4) · H2O
20.8.8SynadelphiteMn92+(As5+O4)2(As3+O3)(OH)9 · 2H2O
20.8.9SterlinghilliteMn3(AsO4)2 · 4H2O
20.8.11Akrochordite(Mn2+,Mg)5(AsO4)2(OH)4 · 4H2O
20.8.12Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2O
20.8.13FluckiteCaMn2+(HAsO4)2 · 2H2O
20.8.14BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2O
20.8.15ParabrandtiteCa2Mn2+(AsO4)2 · 2H2O
20.8.16Wallkilldellite-(Mn)Ca2Mn32+(AsO4)2(OH)4 · 9H2O
20.8.17BerzeliiteNaCa2(Mg,Mn2+)2(AsO4)3
20.8.18Manganberzeliite(Ca,Na)3(Mn2+,Mg)2(AsO4)3
20.8.19Magnesiochlorophoenicite(Mg,Mn)3Zn2(AsO4)(OH,O)6
20.8.20VillyaelleniteMnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O
20.8.21Hematolite(Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23
20.8.22GrischuniteNaCa2Mn52+Fe3+(AsO4)6 · 2H2O

Other Names for Geigerite

Name in Other Languages:
German:Geigerit
Spanish:Geigerita

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.

References for Geigerite

Reference List:
Graeser, S.; Schwander, H.; Bianchi, R.; Pilati, T.; Gramaccioli, C. M. (1989): Geigerite, the manganese analogue of chudobaite: Its description and crystal structure. American Mineralogist: 74, 676-684.

Internet Links for Geigerite

Localities for Geigerite

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
 
  • Liguria
    • La Spezia Province
      • Rocchetta Vara
Cabella, R., Basso, R., Lucchetti, G., Palenzona, A. (2000): Geigerite from Mt. Nero manganese mine (Northern Appennines, La Spezia, Italy). Neues Jahrbuch für Mineralogie, 12, 570-576.
Japan
 
  • Honshu Island
    • Tohoku Region
      • Fukushima Prefecture
        • Iwaki
Kato et al (1990) Ganseki-Koubutsu-Koshogaku Zasshi, 85, 184.; Mineralogical Journal Vol. 18 (1996) , No. 4 pp 155-160
Switzerland
 
  • Grischun (Grisons; Graubünden)
    • Albula Valley
      • Oberhalbstein (Surses; Sursass)
        • Tinizong (Tinzen)
Amer.Mineralogist 74, pages 676 - 684.
Mineral and/or Locality  
Copyright © mindat.org 1993-2015, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: March 3, 2015 07:29:49 Page generated: March 1, 2015 17:08:45