Jennite (original) (raw)
A valid IMA mineral species
About JenniteHide
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Formula:
Ca9(Si3O9)2(OH)8 · 8H2O
Lustre:
Vitreous, Sub-Vitreous, Silky
Specific Gravity:
2.32 - 2.33
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
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Long-form identifier:
mindat:1:1:2087:5
ef001bf3-92fe-42f7-9114-873bb740e992
IMA Classification of JenniteHide
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IMA Formula:
Ca9(Si3O9)2(OH)6 · 8H2O
Type description reference:
Carpenter, A. B., Chalmers, R. A., Gard, J. A., Speakman, K., Taylor, H. F. W. (1966) Jennite, a new mineral. American Mineralogist, 51 (1-2) 56-74
Classification of JenniteHide
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9.DG.20
9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains
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
14.5.27
14 : Silicates not Containing Aluminum
5 : Silicates of Ca
Mineral SymbolsHide
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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.
| Symbol | Source | Reference |
|---|---|---|
| Jnn | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Jnn | Warr (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
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Vitreous, Sub-Vitreous, Silky
Transparency:
Transparent, Translucent
Cleavage:
Distinct/Good
Distinct on {001}
Density:
2.32 - 2.33 g/cm3 (Measured) 2.325 g/cm3 (Calculated)
Optical Data of JenniteHide
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RI values:
_n_α = 1.548 - 1.552 _n_β = 1.562 - 1.564 _n_γ = 1.570 - 1.571
2V:
Measured: 74° , Calculated: 72° to 74°
δ = 0.022
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Optical Extinction:
X ⊥ {001} cleavage; Y ∧ b = 35°-40°.
Pleochroism:
Non-pleochroic
Chemistry of JenniteHide
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Mindat Formula:
Ca9(Si3O9)2(OH)8 · 8H2O
Common Impurities:
Ti,Al,Fe,Mn,Mg,Na,K,P
Crystallography of JenniteHide
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Class (H-M):
1 - Pinacoidal
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)
Morphology:
Blade shaped crystals, fibrous aggregates.
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0012177 | Jennite | Bonaccorsi E, Merlino S, Taylor H F W (2004) The crystal structure of jennite, Ca9Si6O18(OH)6*8H2O Cement and Concrete Research 34 1481-1488 | 2004 | Fuka, Japan | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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) |
Geological EnvironmentHide
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Type Occurrence of JenniteHide
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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:
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
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Other Language Names for JenniteHide
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Relationship of Jennite to other SpeciesHide
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Structurally related to group(s):
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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| 9.DG. | Calcinaksite | KNaCa(Si4O10) · H2O | Tric. 1 : _P_1 |
|---|---|---|---|
| 9.DG. | Barrydawsonite-(Y) | Na1.5Y0.5CaSi3O8(OH) | Mon. 2/m : _P_21/b |
| 9.DG. | Paratobermorite | Ca4(Al0.5Si0.5)2Si4O16(OH)(H2O)2 · (Ca · 3H2O) | Mon. 2/m |
| 9.DG. | Alvesite | NaKZrSi6O15 · 2H2O | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 9.DG.02 | Steedeite | NaMn2[Si3BO9](OH)2 | Tric. 1 : _P_1 |
| 9.DG.02 | Nolzeite | NaMn2[Si3BO9](OH)2 · 2H2O | Tric. 1 : _P_1 |
| 9.DG.05 | Bustamite | CaMn2+(Si2O6) | Tric. 1 : _P_1 |
| 9.DG.05 | Ferrobustamite | CaFe2+(Si2O6) | Tric. 1 |
| 9.DG.05 | Pectolite | NaCa2Si3O8(OH) | Tric. 1 : _P_1 |
| 9.DG.05 | Serandite | NaMn2+2Si3O8(OH) | Tric. 1 : _P_1 |
| 9.DG.05 | Wollastonite | Ca3(Si3O9) | Tric. 1 : _P_1 |
| 9.DG.05 | Wollastonite-1A | CaSiO3 | Tric. 1 : _P_1 |
| 9.DG.05 | Tanohataite | LiMn2Si3O8(OH) | Tric. 1 : _P_1 |
| 9.DG.05 | Schizolite | NaCaMnSi3O8(OH) | Tric. 1 : _P_1 |
| 9.DG.05 | Murakamiite | LiCa2Si3O8(OH) | Tric. 1 : _P_1 |
| 9.DG.05 | Dalnegorskite | Ca5Mn(Si3O9)2 | Tric. 1 : _P_1 |
| 9.DG.07 | Cascandite | CaScSi3O8(OH) | Tric. 1 |
| 9.DG.08 | Plombièrite | [Ca4Si6O16(OH)2 · 2H2O] · (Ca · 5H2O) | Orth. |
| 9.DG.10 | Clinotobermorite | [Ca4Si6O17 · 2H2O] · (Ca · 3H2O) | Mon. |
| 9.DG.10 | Riversideite | Ca5(HSi3O9)2 · 2H2O | Orth. |
| 9.DG.10 | Tobermorite | Ca4Si6O17(H2O)2 · (Ca · 3H2O) | Mon. 2 : _P_21 |
| 9.DG.12 | Jusite | Na2Ca15Al4Si16O54 · 17H2O | |
| 9.DG.12 | Kenotobermorite | Ca4Si6O15(OH)2(H2O)2 · 3H2O | Mon. |
| 9.DG.15 | Foshagite | Ca4(Si3O9)(OH)2 | Tric. 1 : _P_1 |
| 9.DG.20 | Kamenevite | K2TiSi3O9 · H2O | Orth. 222 : _P_212121 |
| 9.DG.25 | Paraumbite | K3Zr2H(Si3O9)2 · nH2O | Orth. m _m_2 |
| 9.DG.25 | Umbite | K2(Zr,Ti)Si3O9 · H2O | Orth. 222 : _P_212121 |
| 9.DG.30 | Sørensenite | Na4SnBe2Si6O16(OH)4 | Mon. 2/m : _B_2/b |
| 9.DG.32 | Escheite | Ca2NaMnTi5[Si12O34]O2(OH)3 · 12H2O | Orth. m _m_2 : A m _a_2 |
| 9.DG.35 | Xonotlite | Ca6(Si6O17)(OH)2 | Mon. 2/m : _B_2/m |
| 9.DG.40 | Hillebrandite | Ca2(SiO3)(OH)2 | Orth. m m m _(_2/_m_2/_m_2/m ) : C m c m |
| 9.DG.45 | Zorite | Na8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2O | Orth. |
| 9.DG.45 | Chivruaiite | Ca4(Ti,Nb)5(Si6O17)2(OH,O)5 · 13-14H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : C m m m |
| 9.DG.50 | Haineaultite | (Na,Ca)5Ca(Ti,Nb)5(Si6O17)2(OH,F)8 · 5H2O | Orth. 222 : _C_222 |
| 9.DG.55 | Epididymite | Na2Be2Si6O15 · H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a |
| 9.DG.60 | Eudidymite | Na2Be2Si6O15 · H2O | Mon. 2/m : _B_2/b |
| 9.DG.65 | Elpidite | Na2ZrSi6O15 · 3H2O | Orth. |
| 9.DG.65 | Patynite | NaKCa4[Si9O23] | Tric. 1 : _P_1 |
| 9.DG.67 | Whelanite | Cu2+2Ca6[Si6O17(OH)](CO3)(OH)3 · 2H2O | Orth. m _m_2 : P n _n_2 |
| 9.DG.70 | Fenaksite | (K,Na)4(Fe,Mn)2(Si4O10)2(OH,F) | Tric. 1 : _P_1 |
| 9.DG.70 | Litidionite | CuNaKSi4O10 | Tric. 1 : _P_1 |
| 9.DG.70 | Manaksite | KNaMnSi4O10 | Tric. 1 : _P_1 |
| 9.DG.70 | Yusupovite | Na2Zr(Si6O15) · 2.5H2O | Mon. 2/m : _B_2/m |
| 9.DG.70 | Enricofrancoite | KNaCaSi4O10 | Tric. 1 : _P_1 |
| 9.DG.75 | Tinaksite | K2Na(Ca,Mn2+)2TiO[Si7O18(OH)] | Tric. |
| 9.DG.75 | Tokkoite | K2Ca4[Si7O18(OH)](OH,F) | Tric. |
| 9.DG.75 | Senkevichite | CsKNaCa2TiO[Si7O18](OH) | Tric. 1 : _P_1 |
| 9.DG.80 | Canasite | K3Na3Ca5Si12O30(OH)4 | Mon. m : B m |
| 9.DG.80 | Fluorcanasite | K3Na3Ca5Si12O30F4 · H2O | Mon. m : B m |
| 9.DG.85 | Miserite | K1.5-x(Ca,Y,REE)5(Si6O15)(Si2O7)(OH,F)2 · yH2O | Tric. |
| 9.DG.90 | Frankamenite | K3Na3Ca5(Si12O30)(F,OH)4 · H2O | Tric. 1 : _P_1 |
| 9.DG.92 | Charoite | (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 · ~3H2O | Mon. 2/m : _P_21/m |
| 9.DG.95 | Yuksporite | K4(Ca,Na)14(Sr,Ba)2(◻,Mn,Fe)(Ti,Nb)4(O,OH)4(Si6O17)2(Si2O7)3(H2O,OH)3 | Mon. 2/m : _P_21/m |
| 9.DG.97 | Eveslogite | (Na,K,Ca,Sr,Ba)48 [(Ti,Nb,Mn,Fe2+)12Si48O144(OH)12](F,OH,Cl)14 | Mon. 2/m : _P_2/m |
Fluorescence of JenniteHide
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May fluoresce dull white shortwave, brighter in LED longwave.
Other InformationHide
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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
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References for JenniteHide
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Reference List:
Carpenter, A. B., Chalmers, R. A., Gard, J. A., Speakman, K., Taylor, H. F. W. (1966) Jennite, a new mineral. American Mineralogist, 51 (1-2) 56-74
Localities for JenniteHide
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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
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- 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.