Danalite Mineral Data + 
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- 76.2.4.1 Helvite Mn4Be3(SiO4)3S P 43n 4 3m
- 76.2.4.2 Danalite Fe4Be3(SiO4)3S P 43n 4 3m
- 76.2.4.3 Genthelvite Zn4Be3(SiO4)3S P 43n 4 3m
- VIII/J.12-10 Danalite Fe4Be3(SiO4)3S P 43n 4 3m
- VIII/J.12-20 Helvite Mn4Be3(SiO4)3S P 43n 4 3m
- VIII/J.12-30 Genthelvite Zn4Be3(SiO4)3S P 43n 4 3m
General Danalite Information |
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 Chemical Formula: |
Fe++4Be3(SiO4)3S | ||
| Composition: |
Molecular Weight = 558.74 gm | ||
| Beryllium 4.84 % Be 13.43 % BeO | |||
| Iron 39.98 % Fe 51.43 % FeO | |||
| Silicon 15.08 % Si 32.26 % SiO2 | |||
| Sulfur 5.74 % S 5.74 % S2- | |||
| - % S -2.86 % -O=S | |||
| Oxygen 34.36 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Fe2+4Be3(SiO4)3S | ||
| IMA Status: |
Valid Species (Pre-IMA) 1866 | ||
| Locality: |
Essex Co., Massachusetts, USA. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named after James Dwight Dana (1813-1895), American mineralogist and author of the Dana mineral classification. | ||
| Synonym: |
ICSD 201639 | ||
| PDF 11-491 | |||
Search for Danalite Images | |||
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Images:
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Danalite Crystallography |
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| Cell Dimensions: |
a = 8.17, Z = 2; V = 545.34 Den(Calc)= 3.40 | ||
| Crystal System: |
Isometric - HextetrahedralH-M Symbol (4 3m) Space Group: P 43n | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.35(1), 1.932(0.7), 2.193(0.5), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Danalite |
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| Cleavage: |
[111] Indistinct | ||
| Color: |
Brown, Brownish black, Grayish yellow, Pink, Reddish brown. | ||
| Density: |
3.43 | ||
| Diaphaniety: |
Transparent to Translucent | ||
| Fracture: |
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. | ||
| Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. | ||
| Hardness: |
5.5-6 - Knife Blade-Orthoclase | ||
| Luminescence: |
Non-fluorescent. | ||
| Luster: |
Vitreous - Greasy | ||
| Streak: |
gray white | ||
Optical Properties of Danalite |
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| Gladstone-Dale: |
CI meas= -0.133 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.143 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2241,KPDmeas= 0.2222,KC= 0.196 |
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| Optical Data: |
Isotropic, n=1.753-1.771. | ||
Calculated Properties of Danalite |
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| Electron Density: |
relectron=3.31 gm/cc |
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| Fermion Index |
Fermion Index = 0.0645 Boson Index = 0.9355 |
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| Photoelectric: |
PEDanalite = 12.95 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Danalite is Not Radioactive |
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Danalite Classification |
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| Dana Class: |
76.2.4.2 (76)Tectosilicate Al-Si Framework | ||
| (76.2)Feldspathoids and related species | |||
| (76.2.4)Helvite group | |||
| Strunz Class: |
VIII/J.12-10 VIII - Silicates | ||
| VIII/J - Tectosilicates (network) with anions unfamiliar to the tetraheders | |||
| VIII/J.12 - Sodalite group, Danalite - Genthelvite series | |||
Other Danalite Information |
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| References: |
NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Danalite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (MinSocAm) 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas 14 - WWW-MINCRYST 15 -École des Mines de Paris Search for Danalite using: Visit our Advertisers for Danalite : Translate Danalite Mineral Data : Ask about Danalite here : Print or Cut-and-Paste your Danalite Specimen Label here :
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