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General Chiavennite Information |
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 Chemical Formula: |
CaMnBe2Si5O13(OH)2•2(H2O) | ||
| Composition: |
Molecular Weight = 531.51 gm | ||
| Calcium 7.54 % Ca 10.55 % CaO | |||
| Manganese 10.34 % Mn 13.35 % MnO | |||
| Beryllium 3.39 % Be 9.41 % BeO | |||
| Silicon 26.42 % Si 56.52 % SiO2 | |||
| Hydrogen 1.14 % H 10.17 % H2O | |||
| Oxygen 51.17 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
CaMn2+Be2Si5O13(OH)2•2(H2O) | ||
| Environment: |
Coating beryl in late-stage pegmatites (Tanno, Italy); in vugs in syenite pegmatites (Norway). | ||
| IMA Status: |
Approved IMA 1983 | ||
| Locality: |
From Tanno, Chiavenna, Lombardy, Italy. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for the locality. | ||
| Synonym: |
ICSD 80917 | ||
| PDF 35-602 | |||
Chiavennite Image | |||
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Images:
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Chiavennite Crystallography |
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| Axial Ratios: |
a:b:c =0.2786:1:0.1565 | ||
| Cell Dimensions: |
a = 8.729, b = 31.326, c = 4.903, Z = 4; V = 1,340.70 Den(Calc)= 2.63 | ||
| Crystal System: |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnab | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.903(1), 15.7(1), 3.28(0.75), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Chiavennite |
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| Cleavage: |
{???} Perfect | ||
| Color: |
Yellow, Orange, Red orange. | ||
| Density: |
2.64 | ||
| Diaphaneity: |
Translucent | ||
| Hardness: |
3 - Calcite | ||
| Luster: |
Vitreous (Glassy) | ||
| Streak: |
white | ||
Optical Properties of Chiavennite |
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| Gladstone-Dale: |
CI meas= -0.026 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= -0.03 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2299,KPDmeas= 0.229,KC= 0.2232 Ncalc = 1.59 |
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| Optical Data: |
Biaxial (+), a=1.596, b=1.6, g=1.618, bire=0.0220, 2V(Calc)=52, 2V(Meas)=50. | ||
Calculated Properties of Chiavennite |
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| Electron Density: |
Bulk Density (Electron Density)=2.63 gm/cc note: Specific Gravity of Chiavennite =2.64 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.04 Boson Index = 0.96 |
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| Photoelectric: |
PEChiavennite = 4.57 barns/electron U=PEChiavennite x rElectron Density= 12.02 barns/cc. |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Chiavennite is Not Radioactive |
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Chiavennite Classification |
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| Dana Class: |
70.05.01.01 (70)Inosilicate Column or Tube Structures | ||
| (70.05)with chains linked by Be | |||
| (70.05.01)Dana Group | |||
| Strunz Class: |
09.GF.25 09 - SILICATES (Germanates) | ||
| 09.G - Tektosilicates with Zeolitic H2O | |||
| 09.GF -Other Rare Zeolites | |||
Other Chiavennite Information |
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| References: |
NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Chiavennite : 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 15 - WWW-MINCRYST 16 - Zeolite Database by Bruno Herreros Search for Chiavennite using: Visit our Advertisers for Chiavennite : A Bijoux Google Search for ChiavenniteAdam's Minerals Google Search for Chiavennite Cape Minerals Google Search for Chiavennite Dakota Matrix Minerals Google Search for Chiavennite Excalibur Mineral Corp. Google Search for Chiavennite Exceptional Minerals Google Search for Chiavennite John Betts Fine Minerals Search for Chiavennite McDougall Minerals Google Search for Chiavennite Mineral News Website Link Rock and Mineral Shows Google Search for Chiavennite Weinrich Minerals, Inc. Google Search for Chiavennite Ask about Chiavennite here : Print or Cut-and-Paste your Chiavennite Specimen Label here :
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