Mineralogy Database

Silhydrite Mineral Data

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General Silhydrite Information

Help on Chemical  Formula: Chemical Formula: 3SiO2•(H2O)
Help on Composition: Composition: Molecular Weight = 198.27 gm
   Silicon   42.50 %  Si   90.91 % SiO2
   Hydrogen   1.02 %  H     9.09 % H2O
   Oxygen    56.49 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: 3(SiO2)•(H2O)
Help on Environment: Environment: Leached magadiite.
Help on IMA Status: IMA Status: Approved IMA 1972
Help on Locality: Locality: Trinity County magadiite locality, 6 miles east of Trinity Center Trinity Co., California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its composition, a silica hydrate.
Help on Name Pronunciation: Name Pronunciation: Silhydrite + Pronunciation Say SILHYDRITE

Silhydrite Image

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Comments: Fine grained massive silhydrite.
Location: Near Rome, Oregon, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Silhydrite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7722:1:0.8477
Help on Cell Dimensions: Cell Dimensions: a = 14.519, b = 18.8, c = 15.938, Z = 28; V = 4,350.39 Den(Calc)= 2.12
Help on Crystal System: Crystal System: Orthorhombic Space Group: P???
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 14.5(1), 3.424(0.82), 3.143(0.35),

Physical Properties of Silhydrite

Help on Color: Color: White.
Help on Density: Density: 2.141
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 1 - Talc
Help on Streak: Streak: white

Optical Properties of Silhydrite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2198,KPDmeas= 0.2177,KC= 0.22
Ncalc = 1.47
Help on Optical Data: Optical Data: Biaxial (?), b=1.466

Calculated Properties of Silhydrite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.14 gm/cc
note: Specific Gravity of Silhydrite =2.12 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PESilhydrite = 1.65 barns/electron
U=PESilhydrite x rElectron Density= 3.54 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Silhydrite is Not Radioactive

Silhydrite Classification

Help on  Dana Class: Dana Class: (75)Tectosilicate Si Tetrahedral Frameworks
  (75.02)SiO2 with H2O and organics
  (75.02.04)Dana Group Silhydrite 3SiO2•(H2O) P??? Ortho
Help on  Strunz Class: Strunz Class: 04.FM.30 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FM -Hydroxides with H2O � (OH); Unclassified
04.FM.30 Silhydrite 3SiO2•(H2O) P??? Ortho

Other Silhydrite Information

Help on References: References: NAME( MinRec) 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 Silhydrite :
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

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Dana No: Strunz No: 04.FM.30





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