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![Mineralogy Database Mineralogy Database](/images/Hedyphane_Crystal.gif) |
Malladrite Mineral Data
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General Malladrite Information
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Chemical Formula: |
Na2SiF6 |
Composition: |
Molecular Weight = 188.06 gm |
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Sodium 24.45 % Na 32.96 % Na2O |
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Silicon 14.93 % Si 31.95 % SiO2 |
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Fluorine 60.62 % F 60.62 % F |
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- %
F -25.52 % -O=F2 |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Na2SiF6 |
Environment: |
Sublimate from fumaroles. |
IMA Status: |
Valid Species (Pre-IMA) 1926 |
Locality: |
Vesuvius, Italy. Link to MinDat.org Location Data. |
Name Origin: |
Named for Alessandro Malladra (1865-1945), Italian volcanologist, director of the Vesuvius Observatory. |
Name Pronunciation: |
Malladrite + Pronunciation |
Synonym: |
ICSD 16598 |
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PDF 33-1280 |
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Malladrite Image |
Images:
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Images:
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Malladrite Crystallography
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Axial Ratios: |
a:c = 1:0.5688 |
Cell Dimensions: |
a = 8.866, c = 5.043, Z = 3; V = 343.30 Den(Calc)= 2.73 |
Crystal System: |
Trigonal - Trapezohedral H-M Symbol (3 2) Space Group: P 321 |
X Ray Diffraction: |
By Intensity(I/Io): 2.281(1), 3.325(0.8), 1.795(0.78), |
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Physical Properties of Malladrite
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Color: |
Rose, Colorless, White. |
Density: |
2.714 - 2.755, Average = 2.73 |
Diaphaneity: |
Transparent |
Habit: |
Crystalline - Fine - Occurs as well-formed fine sized crystals. |
Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
Hardness: |
3 - Calcite |
Luster: |
Vitreous - Greasy |
Streak: |
white |
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Optical Properties of Malladrite
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Optical Data: |
Uniaxial (-), e=1.309, w=1.313, bire=0.0040. |
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Calculated Properties of Malladrite
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Electron Density: |
Bulk Density (Electron Density)=2.61 gm/cc note: Specific Gravity of Malladrite =2.73 gm/cc. |
Fermion Index: |
Fermion Index = 0.0069745004 Boson Index = 0.9930254996 |
Photoelectric: |
PEMalladrite = 1.27 barns/electron U=PEMalladrite x rElectron Density= 3.32 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Malladrite is Not Radioactive |
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Malladrite Classification
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Dana Class: |
11.05.02.01 (11)Halide Complexes; Alumino-fluorides |
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(11.05)where (A)m B (X)6 |
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(11.05.02)Malladrite Group |
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11.05.02.01 Malladrite Na2SiF6 P 321 3 2 |
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11.05.02.02 Bararite (NH4)2SiF6 R 3m 3 2/m |
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11.05.02.03 Demartinite! K2[SiF6] P 63mc 6mm |
Strunz Class: |
03.CH.05 03 - HALIDES |
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03.C - Complex Halides |
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03.CH - |
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03.CH.05 Malladrite Na2SiF6 P 321 3 2 |
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Other Malladrite Information
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References: |
NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8) |
See Also: |
Links to other databases for Malladrite :
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 Malladrite Specimen Label here :
Malladrite
Na2SiF6
Dana No: 11.05.02.01 Strunz No: 03.CH.05
Locality:
Notes:
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