Chiavennite Mineral Data
General Chiavennite Information
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 % H2 O
Oxygen 51.17 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
CaMn2+ Be2 Si5 O13 (OH)2 •2(H2 O)
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
Images:
Chiavennite Crystallography
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 - Dipyramidal H-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),
Physical Properties of Chiavennite
Cleavage:
{???} Perfect
Color:
Yellow, Orange, Red orange.
Density:
2.64
Diaphaneity:
Translucent
Hardness:
3 - Calcite
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Chiavennite
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
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
Electron Density:
Bulk Density (Electron Density)=2.63 gm/cc note: Specific Gravity of Chiavennite =2.64 gm/cc.
Fermion Index:
Fermion Index = 0.04 Boson Index = 0.96
Photoelectric:
PEChiavennite = 4.57 barns/electronU=PEChiavennite x r Electron Density= 12.02 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Chiavennite is Not Radioactive
Chiavennite Classification
Dana Class:
70.05.01.01 (70) Inosilicate Column or Tube Structures
(70.05) with chains linked by Be
(70.05.01) Dana Group
70.05.01.01 Chiavennite CaMnBe2Si5O13(OH)2•2(H2O) Pnab 2/m 2/m 2/m
Strunz Class:
09.GF.25 09 - SILICATES (Germanates)
09.G - Tektosilicates with Zeolitic H2O
09.GF -Other Rare Zeolites
09.GF.25 Chiavennite CaMnBe2Si5O13(OH)2•2(H2O) Pnab 2/m 2/m 2/m
Other Chiavennite Information
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
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Chiavennite
CaMnBe2Si5O13(OH)2•2(H2O)
Dana No: 70.05.01.01 Strunz No: 09.GF.25
Locality:
Notes:
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