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Heliophyllite Mineral Data
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General Heliophyllite Information
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 Chemical Formula: |
Pb6As2O7Cl4 |
| Composition: |
Molecular Weight = 1,646.85 gm |
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Arsenic 9.10 % As 12.98 % AsO2 |
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Lead 75.49 % Pb 81.32 % PbO |
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Chlorine 8.61 % Cl 8.61 % Cl |
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- %
Cl -1.94 % -O=Cl2 |
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Oxygen 6.80 % O |
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______ ______ |
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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
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| 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: |
Orthorhombic Space Group: Unk |
| X Ray Diffraction: |
By Intensity(I/Io): 2.84(1), 2.7(0.4), 3.66(0.35), |
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Physical Properties of Heliophyllite
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| 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 |
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Optical Properties of Heliophyllite
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| Optical Data: |
Biaxial (-), 2V(Meas)=large. Dispersion r > v strong. |
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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
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Calculated Properties of Heliophyllite
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| Electron Density: |
Bulk Density (Electron Density)=6.07 gm/cc
note: Specific Gravity of Heliophyllite =7.33 gm/cc.
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| Fermion Index: |
Fermion Index = 0.16
Boson Index = 0.84 |
| Photoelectric: |
PEHeliophyllite =1,406.90 barns/electron
U=PEHeliophyllite x rElectron Density=8,541.36 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Heliophyllite is Not Radioactive |
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Heliophyllite Classification
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| Dana Class: |
46.02.02.01 (46)Basic or Halogen-Containing Antimonites, Arsenites and Phosphites |
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(46.02)with miscellaneous formulae |
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(46.02.02)Dana Group |
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46.02.02.01 Heliophyllite Pb6As2O7Cl4 Unk Ortho |
| Strunz Class: |
03.DC.65 03 - HALIDES |
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03.D - Oxyhalides, Hydroxyhalides and Related Double Halides |
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03.DC -With Pb (As,Sb,Bi), without Cu |
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03.DC.65 Ecdemite Pb6As2O7Cl4 Unk Tetra |
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03.DC.65 Heliophyllite Pb6As2O7Cl4 Unk Ortho |
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Other Heliophyllite Information
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| 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 :
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Heliophyllite
Pb6As2O7Cl4
Dana No: 46.02.02.01 Strunz No: 03.DC.65
Locality:
Notes:
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