Mineralogy Database

Chiavennite Mineral Data

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General Chiavennite Information

Help on Chemical  Formula: Chemical Formula: CaMnBe2Si5O13(OH)2•2(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: CaMn2+Be2Si5O13(OH)2•2(H2O)
Help on Environment: Environment: Coating beryl in late-stage pegmatites (Tanno, Italy); in vugs in syenite pegmatites (Norway).
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: From Tanno, Chiavenna, Lombardy, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: ICSD 80917
  PDF 35-602

Chiavennite Image

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Comments: Prismatic micro crystals of chiavennite less than 1mm.
Location: Ute, Sweden. Scale: Picture size 1 cm.
© Tom Loomis / Dakota Matrix

Chiavennite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.2786:1:0.1565
Help on Cell Dimensions: Cell Dimensions: a = 8.729, b = 31.326, c = 4.903, Z = 4; V = 1,340.70 Den(Calc)= 2.63
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnab
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.903(1), 15.7(1), 3.28(0.75),

Physical Properties of Chiavennite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Yellow, Orange, Red orange.
Help on Density: Density: 2.64
Help on Diaphaneity: Diaphaneity: Translucent
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Chiavennite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.63 gm/cc
note: Specific Gravity of Chiavennite =2.64 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEChiavennite = 4.57 barns/electron
U=PEChiavennite x rElectron Density= 12.02 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chiavennite is Not Radioactive

Chiavennite Classification

Help on  Dana Class: Dana Class: (70)Inosilicate Column or Tube Structures
  (70.05)with chains linked by Be
  (70.05.01)Dana Group Chiavennite CaMnBe2Si5O13(OH)2•2(H2O) Pnab 2/m 2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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
16 - Zeolite Database by Bruno Herreros

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Dana No: Strunz No: 09.GF.25





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