Heliophyllite Mineral Data

Heliophyllite Mineral Data +

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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.

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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

Diaphaniety:

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:

r_electron=6.07 gm/cc
note: r_{Heliophyllite}=7.33 gm/cc.

Fermion Index

Fermion Index = 0.16686
Boson Index = 0.83314

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Heliophyllite is Not Radioactive

Heliophyllite Classification

Dana Class:

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

(46.2)with miscellaneous formulae

(46.2.2)Dana Group

46.2.2.1 Heliophyllite Pb6As2O7Cl4 Unk Ortho

Strunz Class:

III/D.11-100 III - Halogenides

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

III/D.11 - Mendipite - Onoratoite series

III/D.11-10 Mendipite Pb3Cl2O2 P 2₁2₁2₁ 2 2 2

III/D.11-15 Damaraite Pb3O2(OH)Cl Pmc2 mm2

III/D.11-17 Chubutite* Pb7O6Cl2 Unk Ortho

III/D.11-20 Penfieldite Pb2Cl3(OH) P 6/mmm 6/m 2/m 2/m

III/D.11-30 Blixite Pb2Cl(O,OH)2 Unk Ortho

III/D.11-35 Mereheadite! Pb2O(OH)Cl C 2/c 2/m

III/D.11-40 Sundiusite Pb10(SO4)Cl2O8 C 2,Cm,C 2/m Mono

III/D.11-50 Asisite Pb12(SiO4)O8Cl4 I 4/mmm 4/m 2/m 2/m

III/D.11-55 Parkinsonite (Pb,Mo,[])8O8Cl2 I 4/mmm 4/m 2/m 2/m

III/D.11-60 Thorikosite Pb3(Sb,As)O3(OH)Cl2 I 4/mmm 4/m 2/m 2/m

III/D.11-65 Philolithite! Pb12O6Mn(Mg,Mn)2(Mn,Mg)4(SO4)(CO3)4Cl4(OH)12 P 4₁/nnm 4/m 2/m 2/m

III/D.11-70 Pinalite Pb3(WO4)OCl2 Amam 2/m 2/m 2/m

III/D.11-80 Nadorite PbSbO2Cl Bmmb 2/m 2/m 2/m

III/D.11-90 Perite PbBiO2Cl Bmmb 2/m 2/m 2/m

III/D.11-100 Heliophyllite Pb6As2O7Cl4 Unk Ortho

III/D.11-110 Ecdemite Pb6As2O7Cl4 Unk Tetra

III/D.11-120 Onoratoite Sb8O11Cl2 C 2/m 2/m

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 -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 -École des Mines de Paris

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Heliophyllite

Pb6As2O7Cl4
Dana No: 46.2.2.1 Strunz No: III/D.11-100
Locality:

Notes: