Geigerite Mineral Data

Geigerite Mineral Data +

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General Geigerite Information

Chemical Formula:

Mn5(AsO3OH)2(AsO4)2·10(H2O)

Composition:

Molecular Weight = 1,012.54 gm

Manganese 27.13 % Mn 35.03 % MnO

Arsenic 29.60 % As 45.40 % As₂O₅

Hydrogen 2.19 % H 19.57 % H₂O

Oxygen 41.08 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₅(AsO₃OH)₂(AsO₄)₂·10(H₂O)

IMA Status:

Approved IMA 1989

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 68637

PDF 45-1347

Geigerite Image

Images:

Geigerite

Comments: Small, brownish grains of transparent geigerite (see lower image) in a silicous breccia.
Location: Mt. Nero Mine, Borghetto di Vara, La Spieza, Italy. Scale: 3.5 x 1.5 cm.
© Rich Geiger

Geigerite Crystallography

Axial Ratios:

a:b:c =0.743:1:0.6332

Cell Dimensions:

a = 7.944, b = 10.691, c = 6.77, Z = 1; alpha = 80.97°, beta = 84.2°, gamma = 81.85° V = 559.23 Den(Calc)= 3.01

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 10.45(1), 3.051(0.24), 3.507(0.21),

Crystal Structure:

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

Physical Properties of Geigerite

Cleavage:

[???] Perfect

Color:

Red, Colorless.

Density:

3.05

Diaphaniety:

Transparent to Translucent

Hardness:

3 - Calcite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Geigerite

Gladstone-Dale:

CI meas= 0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2094,KPDmeas= 0.2067,KC= 0.2091

Optical Data:

Biaxial (-), a=1.601, b=1.63, g=1.66, bire=0.0590, 2V(Calc)=88, 2V(Meas)=89.

Calculated Properties of Geigerite

Electron Density:

r_electron=2.90 gm/cc
note: r_Geigerite=3.01 gm/cc.

Fermion Index

Fermion Index = 0.0002
Boson Index = 0.9998

Photoelectric:

PE_Geigerite= 26.95 barns/electron
U=PE_Geigerite x r_electron= 78.04 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Geigerite is Not Radioactive

Geigerite Classification

Dana Class:

39.2.6.2 (39)Hydrated Acid Phosphates, etc

(39.2)H2 (AB)5 (XO4)4 · x(H2O)

(39.2.6)Dana Group

39.2.6.1 Chudobaite (Mg,Zn)5(AsO3OH)2(AsO4)2·10(H2O) P1 1

39.2.6.2 Geigerite Mn5(AsO3OH)2(AsO4)2·10(H2O) P1 1

Strunz Class:

VII/C.06-60 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.06 - Cobaltkoritnigite - Geigerite series

VII/C.06-10 Cobaltkoritnigite (Co,Zn)(AsO3OH)·(H2O) P1 1

VII/C.06-20 Koritnigite ZnHAsO4·(H2O) P1 1

VII/C.06-30 Geminite Cu2As2O7·3(H2O) P1 or P1 Tri

VII/C.06-32 Pushcharovskite! Cu(AsO3OH)·1.5(H2O) P1 or P1 Tri

VII/C.06-35 Yvonite! Cu(AsO3OH)·2(H2O) P1 1

VII/C.06-37 Rollandite! Cu3(AsO4)2·4(H2O) P nma 2/m 2/m 2/m

VII/C.06-40 Chudobaite (Mg,Zn)5(AsO3OH)2(AsO4)2·10(H2O) P1 1

VII/C.06-50 Lindackerite CuCu4(AsO4)2(AsO3OH)2·~9(H2O) P1 1

VII/C.06-60 Geigerite Mn5(AsO3OH)2(AsO4)2·10(H2O) P1 1

Other Geigerite Information

References:

PHYS. PROP.(Am.Min.,Vol.74,p676-684,1989) OPTIC PROP.(Am.Min.,Vol.74,p676-684,1989)

See Also:

Links to other databases for Geigerite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Geigerite

Mn5(AsO3OH)2(AsO4)2·10(H2O)
Dana No: 39.2.6.2 Strunz No: VII/C.06-60
Locality:

Notes: