Geigerite Mineral Data

Geigerite Mineral Data +

[Mineral Specimens] [Our best] [Rare specimens] [Latest updates] [Home Page]
Fine Minerals, Moldavites, Jewellery, Meteorites and Fossils
Rockshop.cz is based in Prague, Czech republic

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Search for Geigerite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Geigerite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Geigerite Mineral Data :

Ask about Geigerite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Geigerite Specimen Label here :

Geigerite

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

Notes: