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Geigerite

A valid IMA mineral species
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09860590015322682247112.jpg
Geigerite, etc.

Săcărâmb, Certeju de Sus, Hunedoara County, Romania
02916280014949069403123.jpg
Geigerite

Monte Nero Mine, Rocchetta di Vara, La Spezia Province, Liguria, Italy
00633650014977154641508.jpg
Geigerite

Monte Nero Mine, Rocchetta di Vara, La Spezia Province, Liguria, Italy
09860590015322682247112.jpg
Geigerite, etc.

Săcărâmb, Certeju de Sus, Hunedoara County, Romania
00024060014946723504303.jpg
Geigerite

Monte Nero Mine, Rocchetta di Vara, La Spezia Province, Liguria, Italy
05353190014946719084748.jpg
Geigerite

Monte Nero Mine, Rocchetta di Vara, La Spezia Province, Liguria, Italy
09860590015322682247112.jpg
Geigerite, etc.

Săcărâmb, Certeju de Sus, Hunedoara County, Romania
00276540014977612627505.jpg
Geigerite

Monte Nero Mine, Rocchetta di Vara, La Spezia Province, Liguria, Italy
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About GeigeriteHide

06293770014947693451884.jpg
Thomas Geiger (1920 - 1990)
Formula:
Mn2+5(AsO4)2(HAsO4)2 · 10H2O
Colour:
Very faint rose-red color. Isolated crystals appear almost colorless.
Lustre:
Vitreous, Pearly
Hardness:
3
Specific Gravity:
3.05
Crystal System:
Triclinic
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.


Unique IdentifiersHide

Mindat ID:
1669
Long-form identifier:
mindat:1:1:1669:4
GUID
(UUID V4):
26d9b9fc-0ff5-4e85-b748-72d54e4eda13

IMA Classification of GeigeriteHide

Classification of GeigeriteHide

Strunz-mindat (2023):
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
Dana 8th ed.:
39.2.6.2

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

20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
GgrIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of GeigeriteHide

Lustre:
Vitreous, Pearly
Transparency:
Transparent
Colour:
Very faint rose-red color. Isolated crystals appear almost colorless.
Streak:
White
Hardness:
3 on Mohs scale
Hardness:
VHN20=105 kg/mm2 - Vickers
Comment:
VHN,50g = 115 kg/mm3
Tenacity:
Very brittle
Cleavage:
Perfect
Parallel to {010}
Density:
3.05(10) g/cm3 (Measured)    3.00 g/cm3 (Calculated)
Comment:
Measured using heavy liquids

Optical Data of GeigeriteHide

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
Optical Extinction:
Z > Y ~ X.
Pleochroism:
Weak
Comments:
Very weakly visible in thicker crystals, colorless to rose-red.
Comments:
X ~ b, Y ~ a, Z ~ c. On {010}: Z Λ c~ 15°, on {100}: Z Λ c~ 6°, X almost normal to {010}.

Chemistry of GeigeriteHide

Mindat Formula:
Mn2+5(AsO4)2(HAsO4)2 · 10H2O
Elements listed:
As, H, Mn, O - search for minerals with similar chemistry

Crystallography of GeigeriteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 7.94 Å, b = 10.69 Å, c = 6.77 Å
α = 80.97°, β = 84.2°, γ = 81.85°
Ratio:
a:b:c = 0.743 : 1 : 0.633
Unit Cell V:
560.3 ų
Z:
1
Morphology:
Platy on {010}, with striation parallel to the c axis

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0001248GeigeriteGraeser S, Schwander H, Bianchi R, Pilati T, Gramaccioli C M (1989) Geigerite, the Mn analogue of chudobaite: Its description and crystal structure American Mineralogist 74 676-68419890293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.45 Å(100)
7.85 Å(13)
3.507 Å(21)
3.340 Å(20)
3.051 Å(24)
3.011 Å(17)
2.786 Å(14)

Geological EnvironmentHide

Type Occurrence of GeigeriteHide

Type Locality:
ⓘ Falotta, Tinizong (Tinzen), Surses, Albula Region, Grisons, Switzerland
General Appearance of Type Material:
Covers the rock in minute crystals, rarely exceeding 0.5 mm in length, on areas of the order of 1 cm2. Also, massive, fine-grained to fibrous aggregates up to 1 cm in length.
Place of Conservation of Type Material:
Natural History Museum, Basel, and at the Mineralogical Institute, University of Basel.
Geological Setting of Type Material:
Alpine metamorphism of manganese ores, with abundant As in surrounding rock
Reference:
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.
Download:
https://rruff.info/rruff_1.0/uploads/Am74_676.pdf

Synonyms of GeigeriteHide

Other Language Names for GeigeriteHide

German:Geigerit
Spanish:Geigerita

Relationship of Geigerite to other SpeciesHide

Member of:
Ondrušite Group > Lindackerite Supergroup
Other Members of this group:
Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2OTric. 1 : P1
KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2OTric. 1 : P1
OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2OTric. 1 : P1

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Geigerite associated with VillyaelleniteMnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O
1 photo of Geigerite associated with CalciteCaCO3
1 photo of Geigerite associated with Manganese Oxides
1 photo of Geigerite associated with SarkiniteMn2+2(AsO4)(OH)

Related Minerals - Strunz-mindat GroupingHide

8.CE.XBabánekiteCu3(AsO4)2 · 8H2O Mon. 2/m : B2/m
8.CE.MonteneroiteCu2+Mn2+2(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.05Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2OTric. 1 : P1
8.CE.10NewberyiteMg(PO3OH) · 3H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CE.15BrassiteMg(HAsO4) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CE.20PhosphorrössleriteMg(PO3OH) · 7H2OMon. 2/m : P2/b
8.CE.20RössleriteMg(HAsO4) · 7H2OMon. 2/m : B2/b
8.CE.25MetaswitzeriteMn2+3(PO4)2 · 4H2OMon. 2/m : P2/b
8.CE.25SwitzeriteMn2+3(PO4)2 · 7H2OMon. 2/m : P21/b
8.CE.30LindackeriteCuCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2OTric. 1 : P1
8.CE.30VeselovskýiteZnCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30PradetiteCoCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2OTric. 1 : P1
8.CE.30Hloušekite(Ni,Co)Cu4(AsO4)2(AsO3OH)2 · 9H2OTric. 1 : P1
8.CE.35BobierriteMg3(PO4)2 · 8H2OMon. 2/m : B2/b
8.CE.40AnnabergiteNi3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40ArupiteNi3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40Barićite(Mg,Fe)3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40ErythriteCo3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40FerrisymplesiteFe3+3(AsO4)2(OH)3 · 5H2OMon.
8.CE.40HörnesiteMg3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40KöttigiteZn3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40ManganohörnesiteMn2+3(AsO4)2 · 8H2OMon. 2/m : P2/m
8.CE.40ParasymplesiteFe2+3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40VivianiteFe2+Fe2+2(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40PakhomovskyiteCo3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.45SymplesiteFe2+3(AsO4)2 · 8H2OTric. 1 : P1
8.CE.50CattiiteMg3(PO4)2 · 22H2OTric. 1 : P1
8.CE.55KoninckiteFe3+PO4 · 3H2OTet. 4 2 2 : P41 21 2
8.CE.60KaňkiteFeAsO4 · 3.5H2OMon. 2 : P2
8.CE.60HilarioniteFe3+2(SO4)(AsO4)(OH) · 6H2OMon. 2/m : B2/m
8.CE.65SteigeriteAl(VO4) · 3H2OMon. 2/m : P21/m
8.CE.70MetaschoderiteAl2(PO4)(VO4) · 6H2OMon. 2/m : P2/m
8.CE.70SchoderiteAl2(PO4)(VO4) · 8H2OMon.
8.CE.75MalhmooditeFeZr(PO4)2 · 4H2OMon. 2/m : P21/b
8.CE.75ZigrasiteMgZr(PO4)2 · 4H2OTric. 1 : P1
8.CE.75UM2009-11-PO:CaHZrCaZr[PO4]2 · 4H2OTric.
8.CE.80SantabarbaraiteFe3+3(PO4)2(OH)3 · 5H2OAmor.
8.CE.85Metaköttigite(Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH)Tric. 1 : P1
8.CE.90SlavkoviteCu13(AsO4)6(AsO3OH)4 · 23H2OTric. 1 : P1

Fluorescence of GeigeriteHide

Other InformationHide

IR Spectrum:
cm-1, transmittance in percent:
3428 (27.6), 1643 (74.5), 824 (27.6),714 (61.1), 400 (48.3), and 370 (47.3).
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for GeigeriteHide

References for GeigeriteHide

Localities for GeigeriteHide

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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Italy
 
  • Liguria
    • La Spezia Province
      • Rocchetta di 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
 
  • Fukushima Prefecture
    • Iwaki City
Kato et al (1990) Ganseki-Koubutsu-Koshogaku Zasshi, 85, 184.
Matsubara, S., Kato, A., Shimizu, M., Sekiuchi, K., and Suzuki, M. (1996) Romeite from the Gozaisho mine, Iwaki, Japan. Mineralogical Journal 18, 155-160.
  • Hokkaidō Prefecture
    • Ishikari Subprefecture
      • Sapporo City
島倉広至, 三浦貴生, 浜根大輔, 松枝大治, & 三浦裕行. (2015). 北海道手稲鉱山産 Te, Bi, As 鉱物. 北海道大学地球物理学研究報告, 78, 19-35.
Romania
 
  • Hunedoara County
    • Certeju de Sus
Collected by Gábor Koller, XRD and EDS: Sándor Szakáll and Béla Fehér
Saudi Arabia
 
  • Medina Region
Faheha, A. A., Hamidalddin, S. Q., Al-Turkestany, N. A., & Ibraheim, N. M. (2012). Concentrations Of Natural And Man-Made Radioactivity Of Surface Soil In Al-Madinh Al-Monawarah, Western Province of Saudi Arabia. Isotope and Radiation Research, 44(2), 495-504.
Switzerland (TL)
 
  • Grisons
    • Albula Region
      • Surses
        • Tinizong (Tinzen)
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.
    • Viamala Region
      • Rheinwald
        • Splügen
Raman & EDX through AMI identificaton service. Found in 2010 by Claudio Leporatti
pers. comm. Roberto Bracco (2015)
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