Heliophyllite Mineral Data

General Heliophyllite Information

Chemical Formula:

Pb6As2O7Cl4

Composition:

Molecular Weight = 1,646.85 gm

Arsenic 9.10 % As 12.98 % AsO₂

Lead 75.49 % Pb 81.32 % PbO

Chlorine 8.61 % Cl 8.61 % Cl

- % Cl -1.94 % -O=Cl₂

Oxygen 6.80 % O

______ ______

100.00 % 100.97 % = TOTAL OXIDE

Empirical Formula:

Pb₆As₂O₇Cl₄

Environment:

Secondary mineral.

IMA Status:

Valid Species (Pre-IMA) 1888

Locality:

Langban, Harstig, and Jakobsverg mines, Varmland Sweden. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for "sun" and "leaf', in reference to its color and structure.

Name Pronunciation:

Heliophyllite + Pronunciation

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Heliophyllite Crystallography

Axial Ratios:

a:b:c =1.0037:1:2.3722

Cell Dimensions:

a = 10.823, b = 10.783, c = 25.58, Z = 8; V = 2,985.30 Den(Calc)= 7.33

Crystal System:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 2.84(1), 2.7(0.4), 3.66(0.35),

Physical Properties of Heliophyllite

Cleavage:

{011} Good

Color:

Greenish yellow, Yellow.

Density:

6.89

Diaphaneity:

Translucent

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

2 - Gypsum

Luster:

Vitreous - Greasy

Streak:

light yellow

Optical Properties of Heliophyllite

Optical Data:

Biaxial (-), 2V(Meas)=large. Dispersion r > v strong.

NCalc= 1.99 - from Gladstone-Dale relationship (KC = 0.1354) where Ncalc=Dcalc*KC+1
NCalc= 1.93 - from Gladstone-Dale relationship (KC = 0.1354) where Ncalc=Dmeas*KC+1

Calculated Properties of Heliophyllite

Electron Density:

Bulk Density (Electron Density)=6.07 gm/cc
note: Specific Gravity of Heliophyllite =7.33 gm/cc.

Fermion Index:

Fermion Index = 0.16
Boson Index = 0.84

Photoelectric:

PE_{Heliophyllite}=1,406.90 barns/electron
U=PE_{Heliophyllite} x rElectron Density=8,541.36 barns/cc.

Radioactivity:

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

Heliophyllite Classification

Dana Class:

46.02.02.01 (46)Basic or Halogen-Containing Antimonites, Arsenites and Phosphites

(46.02)with miscellaneous formulae

(46.02.02)Dana Group

46.02.02.01 Heliophyllite Pb6As2O7Cl4 Unk Ortho

Strunz Class:

03.DC.65 03 - HALIDES

03.D - Oxyhalides, Hydroxyhalides and Related Double Halides

03.DC -With Pb (As,Sb,Bi), without Cu

03.DC.65 Ecdemite Pb6As2O7Cl4 Unk Tetra

03.DC.65 Heliophyllite Pb6As2O7Cl4 Unk Ortho

Other Heliophyllite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Heliophyllite :
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

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

Heliophyllite

Pb6As2O7Cl4
Dana No: 46.02.02.01 Strunz No: 03.DC.65
Locality:

Notes: