Maricopaite Mineral Data

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General Maricopaite Information

Chemical Formula:

Pb7Ca2(Si,Al)48O100•32(H2O)

Composition:

Molecular Weight = 5,088.14 gm

Calcium 1.73 % Ca 2.42 % CaO

Aluminum 6.15 % Al 11.62 % Al₂O₃

Silicon 20.09 % Si 42.98 % SiO₂

Hydrogen 1.26 % H 11.26 % H₂O

Lead 29.32 % Pb 31.58 % PbO

Oxygen 41.44 % O

______ ______

100.00 % 99.87 % = TOTAL OXIDE

Empirical Formula:

Pb_7.2Ca_2.2Al_11.6Si_36.4O₁₀₀•31.8(H₂O)

Environment:

In a hydrothermal Pb-Cu ore vein, coating and filling fractures in quartz.

IMA Status:

Approved IMA 1988

Locality:

Moon Anchor mine, near Tonopah, Maricopa County, Arizona, USA. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Maricopaite + Pronunciation

Synonym:

ICSD 75278

PDF 46-1321

Maricopaite Image

Images:

Maricopaite

Comments: Opaque white prismatic maricopaite microcrystals and yellow crystalline mimetite.
Location: Moon Anchor Mine, near Tonopah, Maricopa County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Maricopaite Crystallography

Axial Ratios:

a:b:c =0.9863:1:0.3826

Cell Dimensions:

a = 19.434, b = 19.702, c = 7.538, Z = 1; V = 2,886.21 Den(Calc)= 2.93

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Cm2m

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

By Intensity(I/I_o): 13.7(1), 3.216(0.5), 9.86(0.4),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Rouse R C , Peacor D R , American Mineralogist , 79 (1994) p.175-184, Maricopaite, an unusual lead calcium zeolite with an interrupted mordenite-like, framework and intrachannel Pb4 tetrahedral clusters

Physical Properties of Maricopaite

Cleavage:

{010} Imperfect

Color:

White.

Density:

2.94

Diaphaneity:

Translucent

Fracture:

Friable - The crumbly disintegration of earthy materials or highly fractured minerals.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

1-1.5 - Talc or a little harder

Luster:

Vitreous - Silky

Streak:

white

Optical Properties of Maricopaite

Gladstone-Dale:

CI meas= 0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1976,KPDmeas= 0.1969,KC= 0.1988
Ncalc = 1.58

Optical Data:

Biaxial (-), a=1.563, b=1.582, g=1.592, bire=0.0290, 2V(Calc)=70, 2V(Meas)=70. Dispersion r > v strong.

Calculated Properties of Maricopaite

Electron Density:

Bulk Density (Electron Density)=2.78 gm/cc
note: Specific Gravity of Maricopaite =2.93 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_Maricopaite= 475.84 barns/electron
U=PE_Maricopaite x rElectron Density=1,322.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Maricopaite is Not Radioactive

Maricopaite Classification

Dana Class:

77.01.06.03 (77)Tectosilicate Zeolite group

(77.01)true zeolites

(77.01.06)Mordenite and related species

77.01.06.01 Mordenite (Ca,Na2,K2)Al2Si10O24•7(H2O) C mc2₁ mm2

77.01.06.02 Epistilbite CaAl2Si6O16•5(H2O) C1 1

77.01.06.03 Maricopaite Pb7Ca2(Si,Al)48O100•32(H2O) Cm2m 2/m 2/m 2/m

77.01.06.04 Dachiardite-Ca (Ca,Na2,K2)5Al10Si38O96•25(H2O) C 2/m 2/m

77.01.06.05 Dachiardite-Na (Na2,Ca,K2)4Al4Si20O48•13(H2O) C 2/m 2/m

77.01.06.06 Ferrierite-Mg (Mg,Na,K)2Mg(Si,Al)18O36•9(H2O) Pnnm 2/m 2/m 2/m

77.01.06.06a Ferrierite-K! (K,Na)2Mg(Si,Al)18O36•9(H2O) Pnnm 2/m 2/m 2/m

77.01.06.06b Ferrierite-Na! (Na,K)2Mg(Si,Al)18O36•9(H2O) P 2₁/n 2/m

77.01.06.07 Boggsite NaCa2(Al5Si19O48)•17(H2O) I mma 2/m 2/m 2/m

77.01.06.08 Gottardiite! Na3Mg3Ca5Al19Si117O272•93(H2O) C mca 2/m 2/m 2/m

77.01.06.09 Terranovaite! (Na,Ca)8(Si68Al12)O160•29(H2O) C mcm 2/m 2/m 2/m

77.01.06.10 Mutinaite! Na3Ca4Si85Al11O192•60(H2O) P nma 2/m 2/m 2/m

77.01.06.12 Direnzoite! NaK6MgCa2(Al13Si47O120)•36H2O Pmmn 2/m 2/m 2/m

Strunz Class:

09.GD.35 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GD -Chains of 6-membered rings – tabular zeolites

09.GD.35 Maricopaite Pb7Ca2(Si,Al)48O100•32(H2O) Cm2m 2/m 2/m 2/m

09.GD.35 Mordenite (Ca,Na2,K2)Al2Si10O24•7(H2O) C mc2₁ mm2

Other Maricopaite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.74,p947,1989) OPTIC PROP.(Am.Min.,Vol.74,p947,1989)

See Also:

Links to other databases for Maricopaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Maricopaite

Pb7Ca2(Si,Al)48O100•32(H2O)
Dana No: 77.01.06.03 Strunz No: 09.GD.35
Locality:

Notes: