Heliophyllite Mineral Data (original) (raw)
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
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
X Ray Diffraction:
By Intensity(I/Io): 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:
PEHeliophyllite =1,406.90 barns/electron
U=PEHeliophyllite 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: