Laurionite Mineral Data

Laurionite Mineral Data +

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General Laurionite Information

Chemical Formula:

PbCl(OH)

Composition:

Molecular Weight = 259.66 gm

Hydrogen 0.39 % H 3.47 % H₂O

Lead 79.80 % Pb 85.96 % PbO

Chlorine 13.65 % Cl 13.65 % Cl

- % Cl -3.08 % -O=Cl₂

Oxygen 6.16 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbCl(OH)

Environment:

Secondary mineral from smelting activities.

IMA Status:

Valid Species (Pre-IMA) 1887

Locality:

Ancient lead slags at Laurium, Greece. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Synonym:

ICSD 28035

PDF 31-680

Laurionite Image

Images:

Laurionite

Comments: Colorless, stellate spray of acicular Laurionite crystals on matrix.
Location: Laurium, Greece. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Laurionite Crystallography

Axial Ratios:

a:b:c =0.7319:1:0.4175

Cell Dimensions:

a = 7.1, b = 9.7, c = 4.05, Z = 4; V = 278.92 Den(Calc)= 6.18

Crystal System:

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

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

By Intensity(I/I_o): 3.3(1), 4.01(0.9), 2.52(0.7),

Forms:

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Forms: [ 1 0 0] [ 1 0 1] [ 8 1 2]

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Crystal Structure:

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Venetopoulos C C , Rentzeperis P J , Zeitschrift fur Kristallographie , 141 (1975) p.246-259, The crystal structure of laurionite, Pb(OH)Cl

View Additional jPOWD Structure files for Laurionite
[1]

Physical Properties of Laurionite

Cleavage:

[010] Distinct

Color:

Colorless, White.

Density:

6.24

Diaphaniety:

Transparent

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Adamantine - Pearly

Streak:

white

Optical Properties of Laurionite

Gladstone-Dale:

CI meas= -0.058 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.068 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1807,KPDmeas= 0.179,KC= 0.1693

Optical Data:

Biaxial (-), a=2.077, b=2.116, g=2.158, bire=0.0810, 2V(Calc)=90, 2V(Meas)=70.

Calculated Properties of Laurionite

Electron Density:

r_electron=5.19 gm/cc
note: r_Laurionite=6.24 gm/cc.

Fermion Index

Fermion Index = 0.17638
Boson Index = 0.82362

Photoelectric:

PE_Laurionite=1,473.61 barns/electron
U=PE_Laurionite x r_electron=7,649.18 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Laurionite is Not Radioactive

Laurionite Classification

Dana Class:

10.2.2.1 (10)Oxyhalides and Hydroxyhalides

(10.2)where A (O,OH) Xq

(10.2.2)Dana Group

10.2.2.1 Laurionite PbCl(OH) Pnam 2/m 2/m 2/m

Strunz Class:

III/D.10-30 III - Halogenides

III/D - Oxi-halogenides with Pb - Bi - Sb and related compounds

III/D.10 - Cotunnite - Matlockite series

III/D.10-10 Fiedlerite Pb3Cl4F(OH)2 P1 1

III/D.10-20 Paralaurionite PbCl(OH) C 2/m 2/m

III/D.10-30 Laurionite PbCl(OH) Pnam 2/m 2/m 2/m

III/D.10-40 Cotunnite PbCl2 Pnam 2/m 2/m 2/m

III/D.10-50 Pseudocotunnite K2PbCl4(?) P nma 2/m 2/m 2/m

III/D.10-60 Matlockite PbFCl P 4/nmm 4/m 2/m 2/m

III/D.10-65 Rorisite (Ca,Mg)FCl P 4/nmm 4/m 2/m 2/m

III/D.10-70 Zavaritskite BiOF P 4/nmm 4/m 2/m 2/m

III/D.10-80 Bismoclite BiOCl P 4/nmm 4/m 2/m 2/m

III/D.10-90 Daubreeite BiO(OH,Cl) P 4/nmm 4/m 2/m 2/m

III/D.10-140 Symesite! Pb10(SO4)O7Cl4·(H2O) B1 1

Other Laurionite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Laurionite

PbCl(OH)
Dana No: 10.2.2.1 Strunz No: III/D.10-30
Locality:

Notes: