Mindat Logo

Jennite

This page is currently not sponsored. Click here to sponsor this page.



Formula:
Ca
 
9
(Si
 
3
O
 
9
)
 
2
(OH)
 
8
· 8H
 
2
O
System:TriclinicColour:White
Hardness:
Name:Named in 1966 by Alden B. Carpenter, Robert A. Chalmers, John Alan Gard, K. Speakman, and Harry Francis West Taylor in honor of U. S. A. Army Colonel Clarence Marvin Jenni [November 3, 1896 USA - November 1, 1973 Columbia, Missouri, USA], curator of the Geological Museum of the University of Missouri (1960-1967, but he remained somewhat active as a curator in retirement until his passing in 1973), Columbia, Missouri, USA, and who discovered the mineral.


The structure of Jennite is composed of wollastonite-type dreier single chains (i.e. single chains with a repeating unit of three (SiO4) tetrahedra), ribbons of edge-sharing (CaO6) octahedra, and additional (CaO6) octahedra on inversion centers (Bonaccorsi et al., 2004).

Classification of Jennite

IMA status:Approved
Strunz 8th edition ID:8/D.18-10
Nickel-Strunz 10th (pending) edition ID:9.DG.20

9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains
Dana 8th edition ID:56.2.4.11

56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
2 : Si2O7 Groups and O, OH, F, and H2O with cations in [4] and/or >[4] coordination
Hey's CIM Ref.:14.5.27

14 : Silicates not Containing Aluminum
5 : Silicates of Ca
mindat.org URL:http://www.mindat.org/min-2087.html
Please feel free to link to this page.

Type Occurrence of Jennite

Type Locality:Crestmore quarries, Crestmore, Riverside Co., California, USA
Place of Conservation of Type Material:Smithsonian Museum 119007
Year of Discovery:1966
Geological Setting of type material:Late stage mineral in skarn

Physical Properties of Jennite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Colour:White
Hardness (Mohs):
Cleavage:Distinct/Good
Distinct on {001}
Density (measured):2.32 - 2.33 g/cm3
Density (calculated):2.34 g/cm3

Crystallography of Jennite

Crystal System:Triclinic
Cell Parameters:a = 10.56Å, b = 7.25Å, c = 10.81Å
α = 99.7°, β = 97.67°, γ = 110.07°
Ratio:a:b:c = 1.457 : 1 : 1.491
Unit Cell Volume:V 749.71 ų (Calculated from Unit Cell)
Z:1
Morphology:Blade shaped crystals, fibrous aggregates.
X-Ray Powder Diffraction:
d-spacingIntensity
10.5 (vvs)
6.46 (ms)
3.47 (ms)
3.04 (s)
2.92 (vs)
2.83 (s)
2.66 (s)

Optical Data of Jennite

Type:Biaxial (-)
RI values: nα = 1.548 - 1.552 nβ = 1.562 - 1.564 nγ = 1.570 - 1.571
2V:Measured: 74° , Calculated: 72° to 74°
Maximum Birefringence:δ = 0.022

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:r < v strong

Chemical Properties of Jennite

Formula:
Ca
 
9
(Si
 
3
O
 
9
)
 
2
(OH)
 
8
· 8H
 
2
O
Simplified for copy/paste:Ca9(Si3O9)2(OH)8·8H2O
Essential elements:Ca, H, O, Si
All elements listed in formula:Ca, H, O, Si
Common Impurities:Ti,Al,Fe,Mn,Mg,Na,K,P

Relationship of Jennite to other Species

Structurally related to group(s):
Tobermorite Group
Related Minerals - Nickel-Strunz Grouping):

- +
9.DG.05Bustamite
CaMn
2+
 
(Si
 
2
O
 
6
)
9.DG.05Ferrobustamite
Ca(Fe
2+
 
,Ca,Mn
2+
 
)(Si
 
2
O
 
6
)
9.DG.05Pectolite
NaCa
 
2
(HSi
 
3
O
 
9
)
9.DG.05Sérandite
Na(Mn
2+
 
,Ca)
 
2
(HSi
 
3
O
 
9
)
9.DG.05Wollastonite
CaSiO
 
3
9.DG.05Wollastonite-1A
CaSiO
 
3
9.DG.07Cascandite
Ca(Sc,Fe
3+
 
)(HSi
 
3
O
 
9
)
9.DG.08Plombièrite
Ca
 
5
(HSi
 
3
O
 
9
)
 
2
· 7H
 
2
O
9.DG.10Clinotobermorite
Ca
 
5
(Si
 
6
O
 
17
) · 5H
 
2
O
9.DG.10Riversideite
Ca
 
5
(HSi
 
3
O
 
9
)
 
2
· 2H
 
2
O
9.DG.10Tobermorite
Ca
 
4+x
(H
 
2-2x
Si
 
6
O
 
17
) · 5H
 
2
O
9.DG.15Foshagite
Ca
 
4
(Si
 
3
O
 
9
)(OH)
 
2
9.DG.25Paraumbite
K
 
3
Zr
 
2
H(Si
 
3
O
 
9
)
 
2
· nH
 
2
O
9.DG.25Umbite
K
 
2
(Zr,Ti)Si
 
3
O
 
9
· H
 
2
O
9.DG.30Sørensenite
Na
 
4
SnBe
 
2
Si
 
6
O
 
16
(OH)
 
4
9.DG.35Xonotlite
Ca
 
6
(Si
 
6
O
 
17
)(OH)
 
2
9.DG.40Hillebrandite
Ca
 
2
(SiO
 
3
)(OH)
 
2
9.DG.45Zorite
Na
 
8
(Ti,Nb)
 
5
(Si
 
6
O
 
17
)
 
2
(OH,O)
 
5
· 14H
 
2
O
9.DG.45Chivruaiite
Ca
 
4
(Ti,Nb)
 
5
(Si
 
6
O
 
17
)
 
2
(OH,O)
 
5
· 13-14H
 
2
O
9.DG.50Haineaultite
(Na,Ca)
 
5
Ca(Ti,Nb)
 
5
(Si
 
6
O
 
17
)
 
2
(OH,F)
 
8
· 5H
 
2
O
9.DG.55Epididymite
Na
 
2
Be
 
2
Si
 
6
O
 
15
· H
 
2
O
9.DG.60Eudidymite
Na
 
2
Be
 
2
Si
 
6
O
 
15
· H
 
2
O
9.DG.65Elpidite
Na
 
2
ZrSi
 
6
O
 
15
· 3H
 
2
O
9.DG.70Fenaksite
(K,Na)
 
4
(Fe,Mn)
 
2
(Si
 
4
O
 
10
)
 
2
(OH,F)
9.DG.70Litidionite
CuNaKSi
 
4
O
 
10
9.DG.70Manaksite
KNaMnSi
 
4
O
 
10
9.DG.75Tinaksite
K
 
2
Na(Ca,Mn
2+
 
)
 
2
Ti[O|Si
 
7
O
 
18
(OH)]
9.DG.75Tokkoite
K
 
2
Ca
 
4
Si
 
7
O
 
17
(O,OH,F)
 
4
9.DG.75Senkevichite
CsKNaCa
 
2
Ti[O|Si
 
7
O
 
18
(OH)]
9.DG.80Canasite
K
 
2
Na
 
4
Ca
 
5
(Si
 
12
O
 
30
(OH,F)
 
4
9.DG.80Fluorcanasite
K
 
3
Na
 
3
Ca
 
5
Si
 
12
O
 
30
F
 
4
· H
 
2
O
9.DG.85Miserite
K(Ca,Ce)
 
4
Si
 
5
O
 
13
(OH)
 
3
9.DG.90Frankamenite
K
 
3
Na
 
3
Ca
 
5
(Si
 
12
O
 
30
)(F,OH)
 
4
· H
 
2
O
9.DG.92Charoite
(K,Sr)
 
15-16
(Ca,Na)
 
32
[Si
 
6
O
 
11
(O,OH)
 
6
]
 
2
[Si
 
12
O
 
18
(O,OH)
 
12
]
 
2
[Si
 
17
O
 
25
(O,OH)
 
18
]
 
2
(OH,F)
 
4
· ~3H
 
2
O
9.DG.95Yuksporite
(K,Ba)NaCa
 
2
(Si,Ti)
 
4
O
 
11
(F,OH) · H
 
2
O
9.DG.97Eveslogite
(Na,K,Ca,Sr,Ba)
 
48
[(Ti,Nb,Mn,Fe
2+
 
)
 
12
Si
 
48
O
 
144
(OH)
 
12
](F,OH,Cl)
 
14
Related Minerals - Hey's Index Grouping:

- +
14.5.1Wollastonite
CaSiO
 
3
14.5.2Wollastonite-7T
14.5.3Wollastonite-2M
CaSiO
 
3
14.5.4Rankinite
Ca
 
3
Si
 
2
O
 
7
14.5.5Kilchoanite
Ca
 
6
(SiO
 
4
)(Si
 
3
O
 
10
)
14.5.6Larnite
Ca
 
2
SiO
 
4
14.5.7Bredigite
Ca
 
7
Mg(SiO
 
4
)
 
4
14.5.8Hatrurite
Ca
 
3
(SiO
 
4
)O
14.5.9Rosenhahnite
HCa
 
3
[Si
 
3
O
 
9
(OH)]
14.5.10Dellaite
Ca
 
6
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
2
14.5.11Afwillite
Ca
 
3
(HSiO
 
4
)
 
2
· 2H
 
2
O
14.5.12Xonotlite
Ca
 
6
(Si
 
6
O
 
17
)(OH)
 
2
14.5.13Foshagite
Ca
 
4
(Si
 
3
O
 
9
)(OH)
 
2
14.5.14Hillebrandite
Ca
 
2
(SiO
 
3
)(OH)
 
2
14.5.15Jaffeite
Ca
 
6
(Si
 
2
O
 
7
)(OH)
 
6
14.5.16Suolunite
Ca
 
2
(H
 
2
Si
 
2
O
 
7
) · H
 
2
O
14.5.17Killalaite
Ca
 
6.4
(H
 
0.6
Si
 
2
O
 
7
)
 
2
(OH)
 
2
14.5.18Okenite
CaSi
 
2
O
 
5
· 2H
 
2
O
14.5.19Riversideite
Ca
 
5
(HSi
 
3
O
 
9
)
 
2
· 2H
 
2
O
14.5.20Trabzonite
Ca
 
4
(Si
 
3
O
 
10
) · 2H
 
2
O
14.5.21Gyrolite
NaCa
 
16
Si
 
23
AlO
 
60
(OH)
 
8
· 14H
 
2
O
14.5.22Foshallasite
Ca
 
3
[Si
 
2
O
 
7
] · 3H
 
2
O(?)
14.5.23Tobermorite
Ca
 
4+x
(H
 
2-2x
Si
 
6
O
 
17
) · 5H
 
2
O
14.5.24Clinotobermorite
Ca
 
5
(Si
 
6
O
 
17
) · 5H
 
2
O
14.5.25Nekoite
Ca
 
3
Si
 
6
O
 
15
·7H
 
2
O
14.5.26Plombièrite
Ca
 
5
(HSi
 
3
O
 
9
)
 
2
· 7H
 
2
O

Other Names for Jennite

Synonyms:
IMA1965-021
Other Languages:
German:Jennit
Spanish:Jennita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Jennite

Reference List:

- +
Carpenter, A.B., Chalmers, R.A., Gard, J.A., Speakman, K., and Taylor, Harry Francis West (1966): Jennite, a new mineral: American Mineralogist 51, 56-74.

Gard, J.A., Taylor, H.F.W., Cliff, G., and Lorimer, G.W. (1977): A reexamination of jennite. American Mineralogist 62, 365-368.

Bonaccorsi, E., Merlino, S., and Taylor, H.F.W. (2004): The crystal structure of jennite, Ca9Si6O18(OH)6·8H2O. Cement and Concrete Research 34(9), 1481-1488.

Internet Links for Jennite

Search Engines:
  • Look for Jennite on Google
  • Look for Jennite images on Google
  • External Links:
  • Look for Jennite on Webmineral
  • Look for Jennite on Athena Mineralogy
  • Look for Jennite on Wikipedia
  • Look for Jennite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Jennite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
  • Buy RARE Minerals from Rocks of Africa
  • High-end worldwide specimens & outstanding customer service
  • Fabre Minerals - search for Jennite specimens
  • Fine and rare minerals from mintreasure.com
  • Buy from David K Joyce minerals
  • Lapis Mineral Magazin
  • Jennite specimens for sale - minfind.com
  • Find Jennite on www.crystalclassics.co.uk
  • Rare and Unusual minerals at Mineralogical Research Company
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Fine Minerals from Weinrich Minerals, Inc.
  • Wilensky Fine Minerals
  • Jobs:
  • Mining & Geology Jobs
  • Localities for Jennite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    France
     
    • Auvergne
      • Puy-de-Dôme
        • Clermont-Ferrand
          • Ceyrat
    XRD analysis (B. Devouard and E. Médard, Clermont-Ferrand)
    Germany
     
    • Bavaria
      • Franconia
        • Maroldsweisach
    Wittern: "Mineralfundorte in Deutschland", 2001
    • Rhineland-Palatinate
      • Eifel
        • Mayen
          • Ettringen
            • Bellerberg volcano
    [Hentschel, G., Die Mineralien der Eifelvulkane, Weise (München), 1983] [Lapis, 15 (5), 9-36]
    Israel
     
    • Negev
    Gross, S. (1977): The Mineralogy of the Hatrurim Formation, Israel. Geological Survey of Israel, Bulletin no. 70, 80 pp.
    Italy
     
    • Latium
      • Viterbo Province
        • Montalto di Castro
          • Pietra Massa Locality
    Passaglia, E. & Turconi, B. (1982): Silicati ed altri minerali di Montalto di Castro - VT. Rivista Mineralogica Italiana, 4/1982, 97-110.
    • Umbria
      • Perugia Province
        • Spoleto
    Stoppa F., Scordari F., Mesto E., Sharygin V.V. and Bortolozzi G. - Calcium-aluminium-silicate-hydrate "cement" phases and rare Ca-zeolite association at Colle Fabbri, Central Italy (2010). Centr.Eur.J.Geosci. 2 (2), pag. 175-187 .
    Japan
     
    • Honshu Island
      • Chugoku Region
        • Hiroshima prefecture
          • Hiba-gun
    Kusachi et al (1984) Koubutsu-Gakkai Kou'en-Youshi, 100.
        • Okayama Prefecture
          • Takahashi City
            • Bitchu-cho-fuka (Bicchu-cho-fuka)
    Handbook of Mineralogy; Mineralogical Journal Vol. 14 (1989) , No. 7 pp 279-292
    Mexico
     
    • Michoacan
      • Mun. de Zitacuaro
    Bernard, J.H. and Hyrsl, J. (2004) Minerals and their Localities. (Granit, Prague)
    Norway
     
    • Telemark
      • Porsgrunn
    Neumann, H. (1985): Norges Mineraler. Norges geologiske Undersøkelse Skrifter 68, 278 pp.
    Russia
     
    • Northern Caucasus Region
      • Kabardino-Balkarian Republic
        • Verkhnechegemskaya caldera (Verkhni Chegem caldera; Upper Chegem caldera)
    A. E. Zadov data
    Slovakia
     
    • Prešov Region
      • Vranov nad Topľou Co.
    Ďuďa,R., et al., 1981: Mineralógia severnej časti Slanských vrchov. Min.Slovaca, Monografia 2, 98s
    South Africa
     
    • Northern Cape Province
      • Kalahari manganese field
        • Hotazel
    Von Bezing, K. L. et al. (1991) The Kalahari manganese field: An Update, Mineralogical Record 22(4) 279-302;
    Uganda
     
    • Kabarole District
    Barker, D.S. and Nixon, P.H. (1989) High-Ca, low-alkali carbonatite volcanism at Fort Portal, Uganda. Contributions to Minralogy and Petrology.: 103: 166-177.
    USA
     
    • California
      • Riverside Co.
        • Crestmore
    Carpenter, A.B., R.A. Chalmers, J.A. Gard, K. Speakman & H.F.W. Taylor (1966), Jennite, a new mineral: American Mineralogist: 51: 56-74; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 479.
    Mineral and/or Locality  
    Search Google  
    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: March 20, 2014 15:49:29
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds