General Information
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 Chemical Formula: |
Mg3(SiO4)(F,OH)2 |
| Composition: |
Molecular Weight = 202.00 gm) |
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| Empirical Formula: |
Mg3(SiO4)F1.5(OH)0.5 |
| Locality: |
Ostanmosoa iron mine, Norberg, Vastmanland, Sweden. |
| Name Origin: |
Named after its locality. |
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Norbergite Image
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Images: |
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Numerous orange to orange-brown dipyramidal crystals of Norbergite in white matrix. Piukkala,
Near Pargas, Finland. 2.1 X 2.7 cm.
Photo by John Veevaert |
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Classification
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| Dana Class: |
52.3.2a.1 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O |
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(52.3)with cations in [6] coordination only |
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(52.3.2a)Humite group |
| Strunz Class: |
VIII/B.04-10 VIII - Silicates |
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VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6] |
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VIII/B.04 - Humite group |
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Crystallography
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| Axial Ratios: |
a:b:c =1.8553:1:2.1702 |
| Cell Dimensions: |
a = 8.72, b = 4.7, c = 10.2, Z = 4; V = 418.04 Den(Calc)= 3.21 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnma |
| X Ray Diffraction: |
By Intensity(I/Io): 3.058(1) 2.23(0.8) 2.639(0.75) |
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Physical Properties
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| Cleavage: |
[???] Distinct |
| Color: |
white, yellow, brown, or red. |
| Density: |
3.1 - 3.2, Average = 3.15 |
| Diaphaniety: |
Transparent to translucent |
| Hardness: |
6-6.5 - Orthoclase-Pyrite |
| Luminescence: |
Fluorescent. |
| Luster: |
Vitreous - Resinous |
| Streak: |
white |
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Optical Properties
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| Optical Data: |
Biaxial (+), a=1.563, b=1.567, g=1.59, bire=0.0270 |
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Other Information
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| References: |
PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) |
| See Also: |
Links to other databases for Norbergite :
1 -American Mineralogist Crystal Structure Database
2 -Athena Mineralogy
3 - Crocoite.com Mineral Locations
4 - EUROmin Project
5 - Franklin Minerals(Dunn)
6 - Franklin Minerals(Palache)
7 -MinDat.org Location Data
8 -MinMax
9 - Scandinavian mineral gallery
10 -University of Colorado - Mineral Structure Data
11 -WWW-MINCRYST
12 -École des Mines de Paris
Search for Norbergite using:
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Ask about Norbergite here :
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Pronunciation Guide 
