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Jennite

A valid IMA mineral species
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06040930014947762923502.jpg
Jennite, etc.

Colle Fabbri, Spoleto, Perugia Province, Umbria, Italy
05554280014947762948426.jpg
Jennite

Xenolith CS-036, Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany
09487320014947762953603.jpg
Jennite, etc.

Zeilberg Quarry, Maroldsweisach, Haßberge District, Lower Franconia, Bavaria, Germany
06040930014947762923502.jpg
Jennite, etc.

Colle Fabbri, Spoleto, Perugia Province, Umbria, Italy
05554280014947762948426.jpg
Jennite

Xenolith CS-036, Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany
09487320014947762953603.jpg
Jennite, etc.

Zeilberg Quarry, Maroldsweisach, Haßberge District, Lower Franconia, Bavaria, Germany
06040930014947762923502.jpg
Jennite, etc.

Colle Fabbri, Spoleto, Perugia Province, Umbria, Italy
04002410014953961349721.jpg
Jennite

Xenolith CS-036, Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany
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About JenniteHide

Formula:
Ca9(Si3O9)2(OH)8 · 8H2O
Colour:
White
Lustre:
Vitreous, Sub-Vitreous, Silky
Hardness:
3½
Specific Gravity:
2.32 - 2.33
Crystal System:
Triclinic
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).


Unique IdentifiersHide

Mindat ID:
2087
Long-form identifier:
mindat:1:1:2087:5
GUID
(UUID V4):
ef001bf3-92fe-42f7-9114-873bb740e992

IMA Classification of JenniteHide

Classification of JenniteHide

Strunz-mindat (2024):
9.DG.20

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference
JnnIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
JnnWarr (2020)Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30

Physical Properties of JenniteHide

Lustre:
Vitreous, Sub-Vitreous, Silky
Transparency:
Transparent, Translucent
Colour:
White
Streak:
White
Hardness:
3½ on Mohs scale
Cleavage:
Distinct/Good
Distinct on {001}
Density:
2.32 - 2.33 g/cm3 (Measured)    2.325 g/cm3 (Calculated)

Optical Data of JenniteHide

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°
Birefringence:
0.022
Max Birefringence:
δ = 0.022
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r < v strong
Optical Extinction:
X ⊥ {001} cleavage; Y ∧ b = 35°-40°.
Pleochroism:
Non-pleochroic

Chemistry of JenniteHide

Mindat Formula:
Ca9(Si3O9)2(OH)8 · 8H2O
Elements listed:
Ca, H, O, Si - search for minerals with similar chemistry
Common Impurities:
Ti,Al,Fe,Mn,Mg,Na,K,P

Crystallography of JenniteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 10.576(2) Å, b = 7.265(2) Å, c = 10.931(3) Å
α = 101.30(1)°, β = 96.98(1)°, γ = 109.65(1)°
Ratio:
a:b:c = 1.456 : 1 : 1.505
Unit Cell V:
759.50 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Blade shaped crystals, fibrous aggregates.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0012177JenniteBonaccorsi E, Merlino S, Taylor H F W (2004) The crystal structure of jennite, Ca9Si6O18(OH)6*8H2O Cement and Concrete Research 34 1481-14882004Fuka, Japan0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.5 Å(100)
6.46 Å(50)
5.95 Å(6)
5.20 Å(6)
4.77 Å(40)
4.48 Å(10)
4.11 Å(20)
3.93 Å(6)
3.72 Å(6)
3.55 Å(20)
3.47 Å(50)
3.29 Å(50)
3.19 Å(6)
3.04 Å(60)
2.92 Å(80)
2.83 Å(60)
2.78 Å(40)
2.66 Å(60)
2.61 Å(20)
2.52 Å(6)
2.43 Å(6)
2.40 Å(6)
2.27 Å(20)
2.21 Å(10)
2.08 Å(10)
2.04 Å(50)
1.984 Å(40)
1.957 Å(30)
1.946 Å(30)
1.875 Å(10)
1.833 Å(10)
1.810 Å(50)
1.735 Å(20)
1.683 Å(30)
1.637 Å(10)
1.610 Å(20)
1.580 Å(10)
1.521 Å(10)
1.486 Å(10)
1.455 Å(10)
1.413 Å(20)
1.393 Å(6)
1.365 Å(6)
1.331 Å(10)
1.312 Å(20)
1.266 Å(6)
1.214 Å(6)
1.177 Å(6)
1.173 Å(20)
1.155 Å(6)
Comments:
ICDD 18-1206.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-𝑇 alteration and/or metamorphism
31 : Thermally altered carbonate, phosphate, and iron formations
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere<0.6
51 : Pyrometamorphic minerals (see also #54 and #56)<0.36

Type Occurrence of JenniteHide

Type Locality:
ⓘ Crestmore quarries, Crestmore, Jurupa Valley, Riverside County, California, USA
General Appearance of Type Material:
White fibrous vein filling, composed of small blade-shaped crystals or fibrous aggregates.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 119007
Geological Setting of Type Material:
Late stage mineral in skarn.
Associated Minerals at Type Locality:
TobermoriteScawtiteCalcite
Reference:
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.

Synonyms of JenniteHide

Other Language Names for JenniteHide

German:Jennit
Spanish:Jennita

Relationship of Jennite to other SpeciesHide

Structurally related to group(s):
Tobermorite GroupCa4+x(AlySi6-y)O15+2x-y · 5H2O

Common AssociatesHide

Associated Minerals Based on Photo Data:
5 photos of Jennite associated with EttringiteCa6Al2(SO4)3(OH)12 · 26H2O
2 photos of Jennite associated with BultfonteiniteCa2(HSiO4)F · H2O
2 photos of Jennite associated with Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O
2 photos of Jennite associated with TobermoriteCa4Si6O17(H2O)2 · (Ca · 3H2O)
1 photo of Jennite associated with PoldervaartiteCaCa[SiO3(OH)](OH)
1 photo of Jennite associated with MerwiniteCa3Mg(SiO4)2
1 photo of Jennite associated with CalciteCaCO3
1 photo of Jennite associated with ScawtiteCa7(Si3O9)2CO3 · 2H2O
1 photo of Jennite associated with HydrocalumiteCa4Al2(OH)12(Cl,CO3,OH)2 · 4H2O
1 photo of Jennite associated with WillhendersoniteKCa[Al3Si3O12] · 5H2O

Related Minerals - Strunz-mindat GroupingHide

9.DG.CalcinaksiteKNaCa(Si4O10) · H2OTric. 1 : P1
9.DG.Barrydawsonite-(Y)Na1.5Y0.5CaSi3O8(OH)Mon. 2/m : P21/b
9.DG.ParatobermoriteCa4(Al0.5Si0.5)2Si4O16(OH)(H2O)2 · (Ca · 3H2O)Mon. 2/m
9.DG.EnricofrancoiteKNaCaSi4O10Tric. 1 : P1
9.DG.AlvesiteNaKZrSi6O15 · 2H2OOrth. mmm (2/m 2/m 2/m)
9.DG.02SteedeiteNaMn2[Si3BO9](OH)2Tric. 1 : P1
9.DG.02NolzeiteNaMn2[Si3BO9](OH)2 · 2H2OTric. 1 : P1
9.DG.05BustamiteCaMn2+(Si2O6)Tric. 1 : P1
9.DG.05FerrobustamiteCaFe2+(Si2O6)Tric. 1
9.DG.05PectoliteNaCa2Si3O8(OH)Tric. 1 : P1
9.DG.05SeranditeNaMn2+2Si3O8(OH)Tric. 1 : P1
9.DG.05WollastoniteCa3(Si3O9)Tric. 1 : P1
9.DG.05Wollastonite-1ACaSiO3Tric. 1 : P1
9.DG.05TanohataiteLiMn2Si3O8(OH)Tric. 1 : P1
9.DG.05SchizoliteNaCaMnSi3O8(OH)Tric. 1 : P1
9.DG.05MurakamiiteLiCa2Si3O8(OH)Tric. 1 : P1
9.DG.05DalnegorskiteCa5Mn(Si3O9)2Tric. 1 : P1
9.DG.07CascanditeCaScSi3O8(OH)Tric. 1
9.DG.08Plombièrite[Ca4Si6O16(OH)2 · 2H2O] · (Ca · 5H2O)Orth.
9.DG.10Clinotobermorite[Ca4Si6O17 · 2H2O] · (Ca · 3H2O)Mon.
9.DG.10RiversideiteCa5(HSi3O9)2 · 2H2OOrth.
9.DG.10TobermoriteCa4Si6O17(H2O)2 · (Ca · 3H2O)Mon. 2 : P21
9.DG.12JusiteNa2Ca15Al4Si16O54 · 17H2O
9.DG.12KenotobermoriteCa4Si6O15(OH)2(H2O)2 · 3H2OMon.
9.DG.15FoshagiteCa4(Si3O9)(OH)2Tric. 1 : P1
9.DG.20KameneviteK2TiSi3O9 · H2OOrth. 2 2 2 : P21 21 21
9.DG.25ParaumbiteK3Zr2H(Si3O9)2 · nH2OOrth. mm2
9.DG.25UmbiteK2(Zr,Ti)Si3O9 · H2OOrth. 2 2 2 : P21 21 21
9.DG.30SørenseniteNa4SnBe2Si6O16(OH)4Mon. 2/m : B2/b
9.DG.32Escheite Ca2NaMnTi5[Si12O34]O2(OH)3 · 12H2OOrth. mm2 : Ama2
9.DG.35XonotliteCa6(Si6O17)(OH)2Mon. 2/m : B2/m
9.DG.40HillebranditeCa2(SiO3)(OH)2Orth. mmm (2/m 2/m 2/m) : Cmcm
9.DG.45ZoriteNa8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2OOrth.
9.DG.45ChivruaiiteCa4(Ti,Nb)5(Si6O17)2(OH,O)5 · 13-14H2OOrth. mmm (2/m 2/m 2/m) : Cmmm
9.DG.50Haineaultite(Na,Ca)5Ca(Ti,Nb)5(Si6O17)2(OH,F)8 · 5H2OOrth. 2 2 2 : C2 2 2
9.DG.55EpididymiteNa2Be2Si6O15 · H2OOrth. mmm (2/m 2/m 2/m) : Pnma
9.DG.60EudidymiteNa2Be2Si6O15 · H2OMon. 2/m : B2/b
9.DG.65ElpiditeNa2ZrSi6O15 · 3H2OOrth.
9.DG.65PatyniteNaKCa4[Si9O23]Tric. 1 : P1
9.DG.67WhelaniteCu2+2Ca6[Si6O17(OH)](CO3)(OH)3 · 2H2OOrth. mm2 : Pnn2
9.DG.70Fenaksite(K,Na)4(Fe,Mn)2(Si4O10)2(OH,F)Tric. 1 : P1
9.DG.70LitidioniteCuNaKSi4O10Tric. 1 : P1
9.DG.70ManaksiteKNaMnSi4O10Tric. 1 : P1
9.DG.70YusupoviteNa2Zr(Si6O15) · 2.5H2OMon. 2/m : B2/m
9.DG.75TinaksiteK2Na(Ca,Mn2+)2TiO[Si7O18(OH)]Tric.
9.DG.75TokkoiteK2Ca4[Si7O18(OH)](OH,F)Tric.
9.DG.75SenkevichiteCsKNaCa2TiO[Si7O18](OH)Tric. 1 : P1
9.DG.80CanasiteK3Na3Ca5Si12O30(OH)4Mon. m : Bm
9.DG.80FluorcanasiteK3Na3Ca5Si12O30F4 · H2OMon. m : Bm
9.DG.85MiseriteK1.5-x(Ca,Y,REE)5(Si6O15)(Si2O7)(OH,F)2 · yH2OTric.
9.DG.90FrankameniteK3Na3Ca5(Si12O30)(F,OH)4 · H2OTric. 1 : P1
9.DG.92Charoite(K,Sr)15-16(Ca,Na)32[Si6O11(O,OH)6]2[Si12O18(O,OH)12]2[Si17O25(O,OH)18]2(OH,F)4 · ~3H2OMon. 2/m : P21/m
9.DG.95YuksporiteK4(Ca,Na)14(Sr,Ba)2(◻,Mn,Fe)(Ti,Nb)4(O,OH)4(Si6O17)2(Si2O7)3(H2O,OH)3Mon. 2/m : P21/m
9.DG.97Eveslogite(Na,K,Ca,Sr,Ba)48 [(Ti,Nb,Mn,Fe2+)12Si48O144(OH)12](F,OH,Cl)14Mon. 2/m : P2/m

Fluorescence of JenniteHide

In UV light:
May fluoresce dull white shortwave, brighter in LED longwave.

Other InformationHide

Thermal Behaviour:
Stable up to 70°C. From 70-90°C there is a sharp loss of water, totaling 7% of the initial weight.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for JenniteHide

References for JenniteHide

Localities for JenniteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
France
 
  • Auvergne-Rhône-Alpes
    • Puy-de-Dôme
      • Clermont-Ferrand
        • Beaumont
XRD analysis (B. Devouard and E. Médard, Clermont-Ferrand)
Germany
 
  • Bavaria
    • Lower Franconia
      • Haßberge District
        • Maroldsweisach
Wittern (2001) +1 other reference
  • Rhineland-Palatinate
    • Mayen-Koblenz
      • Vordereifel
        • Ettringen
Lapis (5) +1 other reference
Galuskin et al. (2016)
in the collection of Christof Schäfer
in the collection of Christof Schäfer
Italy
 
  • Lazio
    • Metropolitan City of Rome Capital
      • Rome
        • Valleranello
Carlini et al. (2018)
    • Viterbo Province
      • Montalto di Castro
        • Pietra Massa Locality
Passaglia et al. (1982)
  • Umbria
    • Perugia Province
      • Spoleto
Wheeler et al. (1996) +1 other reference
Japan
 
  • Hiroshima Prefecture
    • Shoubara City
Kusachi et al (1984)
  • Okayama Prefecture
    • Takahashi City
      • Bitchū
        • Fuka
Kusachi et al. (1989) +1 other reference
Jordan
 
  • Amman Governorate
    • Transjordan Plateau
      • Daba-Siwaqa complex
Pitty et al. (2010)
        • Hashem region
          • Lisdan-Siwaga Fault
Fleurance et al. (2013)
Galuskina et al. (2019)
  • Irbid Governorate
    • Maqarin area
Khoury et al. (1985) +1 other reference
Mexico
 
  • Michoacan
    • Zitacuaro Municipality
Bernard et al. (2004)
Middle East
 
Gross (1977)
Norway
 
  • Telemark
    • Porsgrunn
Henrich Neumann (1985)
Russia
 
  • Kabardino-Balkaria
    • Baksan Valley
Galuskin et al. (2012)
A. E. Zadov data
Galuskina et al. (2015)
  • Sverdlovsk Oblast
    • Asbest
Antonov A.A. [Антонов А.А.] (2003)
Slovakia
 
  • Prešov Region
    • Vranov nad Topľou District
      • Vechec
Ďuďa et al. (1993)
South Africa
 
  • Northern Cape
    • John Taolo Gaetsewe District Municipality
      • Joe Morolong Local Municipality
        • Hotazel
Von Bezing (1991)
Uganda
 
  • Western Region
    • Kabarole
Barker et al. (1989)
USA (TL)
 
  • California
    • Riverside County
      • Jurupa Valley
        • Crestmore
Van Nostrand Reinholt Press: 479. +2 other references
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