Paralaurionite Mineral Data

Paralaurionite Mineral Data +

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General Paralaurionite 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) 1899

Locality:

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

Name Origin:

Named from its similarity to laurionite.

Synonym:

ICSD 74291

PDF 16-158

Rafaelite

Paralaurionite Image

Images:

Paralaurionite

Comments: Transparent, prismatic Paralaurionite crystal.
Location: Laurium, Greece. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Paralaurionite Crystallography

Axial Ratios:

a:b:c =2.711:1:1.8065

Cell Dimensions:

a = 10.79, b = 3.98, c = 7.19, Z = 4; beta = 117.2° V = 274.62 Den(Calc)= 6.28

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 3.21(1), 5.14(1), 2.51(0.9),

Forms:

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

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Crystal Structure:

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Merlino S , Pasero M , Perchialli N , Mineralogical Magazine , 57 (1993) p.323-328, Crystal structure of paralaurionite and its OD relationships with laurionite

Physical Properties of Paralaurionite

Cleavage:

[001] Distinct

Color:

Colorless, Violet, Green yellow, White.

Density:

6.05

Diaphaniety:

Transparent

Habit:

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

Hardness:

3 - Calcite

Luster:

Subadamantine

Streak:

white

Optical Properties of Paralaurionite

Gladstone-Dale:

CI meas= -0.107 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.066 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1805,KPDmeas= 0.1873,KC= 0.1693

Optical Data:

Biaxial (-), a=2.05, b=2.15, g=2.2, bire=0.1500

Calculated Properties of Paralaurionite

Electron Density:

r_electron=5.22 gm/cc
note: r_{Paralaurionite}=6.28 gm/cc.

Fermion Index

Fermion Index = 0.17638
Boson Index = 0.82362

Photoelectric:

PE_{Paralaurionite}=1,473.61 barns/electron
U=PE_{Paralaurionite} x r_electron=7,698.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Paralaurionite is Not Radioactive

Paralaurionite Classification

Dana Class:

10.2.3.1 (10)Oxyhalides and Hydroxyhalides

(10.2)where A (O,OH) Xq

(10.2.3)Dana Group

10.2.3.1 Paralaurionite PbCl(OH) C 2/m 2/m

10.2.3.2 Belloite! Cu(OH)Cl P 2₁/a 2/m

Strunz Class:

III/D.10-20 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 Paralaurionite Information

References:

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

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Paralaurionite

PbCl(OH)
Dana No: 10.2.3.1 Strunz No: III/D.10-20
Locality:

Notes: