Mineralogy Database

Jennite Mineral Data

Search Webmineral :
  

General Jennite Information

Help on Chemical Formula: Chemical Formula: Ca9Si6O18(OH)6•8H2O
Help on Composition: Composition: Molecular Weight = 1,063.37 gm
   Calcium   33.92 %  Ca   47.46 % CaO
   Silicon   15.85 %  Si   33.90 % SiO2
   Hydrogen   2.09 %  H    18.64 % H2O
   Oxygen    48.15 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca9Si6O18(OH)6•8(H2O)
Help on Environment: Environment: Late stage mineral in metamorphosed limestone.
Help on IMA Status: IMA Status: Approved IMA 1966
Help on Locality: Locality: Crestmore Quarry, 5 miles NW of Riverside, Riverside Co. California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Clarence Marvin Jenni (1896-1973), American mineral collector and director of the Geological Museum, University of Missouri.
Help on Name Pronunciation: Name Pronunciation: Jennite Say JENNITE
 

Jennite Image

Click Here for Larger Image in a New Browser Window Images:
Click Here for Larger Image

  Jennite

Comments: Bright white fibrous jennite veinlet in rock.
Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Jennite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.4557:1:1.5046
Help on Cell Dimensions: Cell Dimensions: a = 10.576, b = 7.265, c = 10.931, Z = 1; alpha = 101.3°, beta = 96.98°, gamma = 109.65° V = 769.89 Den(Calc)= 2.29
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 10.5(1), 2.92(0.8), 3.04(0.6),
 

Physical Properties of Jennite

Help on Cleavage: Cleavage: {001} Distinct
Help on Color: Color: White.
Help on Density: Density: 2.32 - 2.33, Average = 2.32
Help on Habit: Habit: Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luminescence: Luminescence: Sometimes Fluorescent, Short UV=weak white.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Jennite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.036 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2419,KPDmeas= 0.2414,KC= 0.2335
Ncalc = 1.54
Help on Optical Data: Optical Data: Biaxial (-), a=1.548-1.552, b=1.562-1.564, g=1.57-1.571, bire=0.0190-0.0220, 2V(Calc)=72-74, 2V(Meas)=74.
 

Calculated Properties of Jennite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.37 gm/cc
note: Specific Gravity of Jennite =2.33 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0080927409
Boson Index = 0.9919072591
Help on Photoelectric: Photoelectric: PEJennite = 4.74 barns/electron
U=PEJennite x rElectron Density= 11.23 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Jennite is Not Radioactive
 

Jennite Classification
Help on Dana Class: Dana Class: 56.02.04.11 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.04)Cuspidine - Wohlerite group
 
56.02.04.01 Baghdadite Ca3(Zr,Ti)Si2O9 P 21/a 2/m
 
56.02.04.02 Burpalite Na2CaZrSi2O7F2 P 21/a 2/m
 
56.02.04.03 Cuspidine Ca4Si2O7(F,OH)2 P 21/c 2/m
 
56.02.04.04 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 21/a 2/m
 
56.02.04.05 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 21/m 2/m
 
56.02.04.06 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m
 
56.02.04.07 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1
 
56.02.04.08 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1
 
56.02.04.09 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1
 
56.02.04.10 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 21/n 2/m
 
56.02.04.11 Jennite Ca9Si6O18(OH)6•8H2O P1 1
 
56.02.04.12 Komarovite (Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2•3.5(H2O) Unk Ortho
 
56.02.04.13 Natrokomarovite* Na6CaNb6[Si4O12F2•4(H2O) C mmm 2/m 2/m 2/m
 
56.02.04.14 Suolunite Ca2Si2O5(OH)2•(H2O) F dd2 mm2
 
56.02.04.15 Mongolite Ca4Nb6Si5O24(OH)10•5(H2O) Unk Tetra
 
56.02.04.16 Kristiansenite! Ca2ScSn(Si2O7)(Si2O6OH) C1 1
 
56.02.04.17 Kochite! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1
 
56.02.04.18 Marianoite! Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4 P 21 2/m
Help on Strunz Class: Strunz Class: 09.DG.20 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DG -Inosilicates with 3-periodic single and multiple chains
 
09.DG.20 Jennite Ca9Si6O18(OH)6•8H2O P1 1
 

Other Jennite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8, AmMin 90:772) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Jennite :
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

Search for Jennite using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Jennite :

Ask about Jennite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa�ol

Print or Cut-and-Paste your Jennite Specimen Label here :

Jennite

Ca9Si6O18(OH)6•8H2O
Dana No: 56.02.04.11 Strunz No: 09.DG.20
Locality:

 

Notes:

 
 
   
 

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.