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Riversideite

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Formula:
Ca5(HSi3O9)2 · 2H2O
System:
Orthorhombic
Colour:
White
Hardness:
3
Name:
Named after its discovery locality.
The exact structure of Riversideite is not known, but a reliable model can be derived from the structures of Tobermorite and Clinotobermorite. In this model, the Riversideite structure contains composite layers, consisting of infinite sheets of (CaO7) polyhedra, to both sides of which dreier single chains of (SiO4) tetrahedra are attached, running along the b axis. Those layers are stacked along the c axis and linked by additional calcium ions and water molecules which occupy cavities between the layers (Ferraris et al., 2004).

A very similar structure is found in Plombièrite.

Classification of Riversideite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
9.DG.10

9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains
72.3.2.4

72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
3 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 3-, 4-, or 5-membered rings and 8-membered rings
14.5.19

14 : Silicates not Containing Aluminum
5 : Silicates of Ca
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Type Occurrence of Riversideite

Year of Discovery:
1917

Physical Properties of Riversideite

Silky
Colour:
White
Hardness (Mohs):
3

Crystallography of Riversideite

Crystal System:
Orthorhombic
Cell Parameters:
a = 5.57Å, b = 3.64Å, c = 18.79Å
Ratio:
a:b:c = 1.53 : 1 : 5.162
Unit Cell Volume:
V 380.96 ų (Calculated from Unit Cell)

Optical Data of Riversideite

Type:
Biaxial (+)
RI values:
nα = 1.600 nβ = 1.601 nγ = 1.605
Max Birefringence:
δ = 0.005
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v weak

Chemical Properties of Riversideite

Formula:
Ca5(HSi3O9)2 · 2H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Al,Fe,Mg

Relationship of Riversideite to other Species

Other Members of Group:
Clinotobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)
Kenotobermorite[Ca4Si6O15(OH)2·2H2O]·3H2O
Plombièrite[Ca4Si6O16(OH)2 · 2H2O]·(Ca·5H2O)
Tobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)
9.DG.05BustamiteCaMn2+(Si2O6)
9.DG.05FerrobustamiteCaFe2+(Si2O6)
9.DG.05PectoliteNaCa2(HSi3O9)
9.DG.05SéranditeNa(Mn2+,Ca)2(HSi3O9)
9.DG.05WollastoniteCaSiO3
9.DG.05Wollastonite-1ACaSiO3
9.DG.07CascanditeCa(Sc,Fe3+)(HSi3O9)
9.DG.08Plombièrite[Ca4Si6O16(OH)2 · 2H2O]·(Ca·5H2O)
9.DG.10Clinotobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)
9.DG.10Tobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)
9.DG.15FoshagiteCa4(Si3O9)(OH)2
9.DG.20JenniteCa9(Si3O9)2(OH)8 · 8H2O
9.DG.25ParaumbiteK3Zr2H(Si3O9)2 · nH2O
9.DG.25UmbiteK2(Zr,Ti)Si3O9 · H2O
9.DG.30SørenseniteNa4SnBe2Si6O16(OH)4
9.DG.35XonotliteCa6(Si6O17)(OH)2
9.DG.40HillebranditeCa2(SiO3)(OH)2
9.DG.45ZoriteNa8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2O
9.DG.45ChivruaiiteCa4(Ti,Nb)5(Si6O17)2(OH,O)5 · 13-14H2O
9.DG.50Haineaultite(Na,Ca)5Ca(Ti,Nb)5(Si6O17)2(OH,F)8 · 5H2O
9.DG.55EpididymiteNa2Be2Si6O15 · H2O
9.DG.60EudidymiteNa2Be2Si6O15 · H2O
9.DG.65ElpiditeNa2ZrSi6O15 · 3H2O
9.DG.70Fenaksite(K,Na)4(Fe,Mn)2(Si4O10)2(OH,F)
9.DG.70LitidioniteCuNaKSi4O10
9.DG.70ManaksiteKNaMnSi4O10
9.DG.75TinaksiteK2Na(Ca,Mn2+)2Ti[O|Si7O18(OH)]
9.DG.75TokkoiteK2Ca4Si7O17(O,OH,F)4
9.DG.75SenkevichiteCsKNaCa2Ti[O|Si7O18(OH)]
9.DG.80CanasiteK2Na4Ca5(Si12O30(OH,F)4
9.DG.80FluorcanasiteK3Na3Ca5Si12O30F4 · H2O
9.DG.85MiseriteK1.5-x(Ca,Y,REE)5(Si6O15)(Si2O7)(OH,F)2 · yH2O
9.DG.90FrankameniteK3Na3Ca5(Si12O30)(F,OH)4 · H2O
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 · ~3H2O
9.DG.95Yuksporite(K,Ba)NaCa2(Si,Ti)4O11(F,OH) · H2O
9.DG.97Eveslogite(Na,K,Ca,Sr,Ba)48 [(Ti,Nb,Mn,Fe2+)12Si48O144(OH)12](F,OH,Cl)14
14.5.1WollastoniteCaSiO3
14.5.2Wollastonite-7T
14.5.3Wollastonite-2MCaSiO3
14.5.4RankiniteCa3Si2O7
14.5.5KilchoaniteCa6(SiO4)(Si3O10)
14.5.6LarniteCa2SiO4
14.5.7BredigiteCa7Mg(SiO4)4
14.5.8HatruriteCa3(SiO4)O
14.5.9RosenhahniteHCa3[Si3O9(OH)]
14.5.10DellaiteCa6(Si2O7)(SiO4)(OH)2
14.5.11AfwilliteCa3(HSiO4)2 · 2H2O
14.5.12XonotliteCa6(Si6O17)(OH)2
14.5.13FoshagiteCa4(Si3O9)(OH)2
14.5.14HillebranditeCa2(SiO3)(OH)2
14.5.15JaffeiteCa6(Si2O7)(OH)6
14.5.16SuoluniteCa2(H2Si2O7) · H2O
14.5.17KillalaiteCa6.4(H0.6Si2O7)2(OH)2
14.5.18OkeniteCa10Si18O46 · 18H2O
14.5.20TrabzoniteCa4(Si3O9)(OH)2
14.5.21GyroliteNaCa16Si23AlO60(OH)8 · 14H2O
14.5.22FoshallasiteCa3[Si2O7] · 3H2O(?)
14.5.23Tobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)
14.5.24Clinotobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)
14.5.25NekoiteCa3Si6O15·7H2O
14.5.26Plombièrite[Ca4Si6O16(OH)2 · 2H2O]·(Ca·5H2O)
14.5.27JenniteCa9(Si3O9)2(OH)8 · 8H2O

Other Names for Riversideite

Name in Other Languages:

Other Information

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

References for Riversideite

Reference List:
Taylor, H.F.W. (1953), Crestmoreite and riversideite, Mineralogical Magazine: 30: 155-165.

McConnell, J.D.C. (1954), The hydrated calcium silicates riversideite, tobermorite and plombierite, Mineralogical Magazine: 30: 293-305.

American Mineralogist (1954): 39: 1038.

American Mineralogist (1999): 84: 1613-1621.

Ferraris, G., Makovicky, E., and Merlino, S. (2004): Crystallography of Modular Materials. IUCr Monographs on Crystallography, Vol. 15. Oxford University Press, Oxford (UK), pp. 164-166.

Internet Links for Riversideite

Localities for Riversideite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Austria
 
  • Styria
    • Bad Radkersburg
      • Klöch
Postl, W., Bernhard, F., Bojar, H.-P., Kolitsch, U. & Brandstätter, F. (2012): 1775) Magnesiochromit, Phillipsit-Ca, Chabasit-Ca und Vertumnit sowie eine Ergänzung zur Phase Ca3Ti(Fe,Al)2O8 (= Shulamitit) in einem Ca-reichen Xenolith aus dem Basaltsteinbruch in Klöch, Steiermark. Pp. 172-174 in Niedermayr, G. et al. (2012): Neue Mineralfunde aus Österreich LXI. Carinthia II, 202./122., 123-180.
Germany
 
  • Bavaria
    • Franconia
      • Maroldsweisach
Wittern: "Mineralfundorte in Deutschland", 2001
  • Lower Saxony
    • Osnabrück
      • Georgsmarienhütte
Schnorrer, G., Stahlmann, W., Mollenkamp, A. (2001): Sekundärmineralisation in den Hochofenschlacken des Hüttenwerkes in Georgsmarienhütte, heutige Georgsmarienhütte GmbH. Aufschluss 52, 99-108.
Israel
 
  • Negev
Gross, S. (1977): The Mineralogy of the Hatrurim Formation, Israel. Geological Survey of Israel, Bulletin no. 70, 80 pp.
Romania
 
  • Hunedoara Co.
    • Hunedoara
Marincea, Ş., Bilal, E., Verkaeren, J., Pascal, M.-L., and Fonteilles, M. (2001) Superposed paragenesis in spurrite-, tilleyite- and gehlenite-bearing skarns from Cornet Hill, Apuseni Mountains, Romania. Canadian Mineralogist: 39: 1435-1453.
USA (TL)
 
  • California
    • Riverside Co.
      • Crestmore
[Bull.Dept.Geol.Univ. California (1917) 10, 327-360 (347); micromounts@yahoogroups.com]
          • Sky Blue Hill
Eakle, Arthur Starr (1917), Minerals associated with the crystalline limestone at Crestmore, Riverside County, California: University of California Department of Geological Sciences Bulletin: 10: 347; Woodford, A.O., Crippen, R.A., and Garner, K.B. (1941) Section Across Commercial Quarry, Crestmore, California. American Mineralogist: 26: 367; Heller, L. & H.F.W. Taylor (1956), Crystallographic data for the calcium silicates, H.M. Stationery Office, 79 pp.: 34; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 477.
Mineral and/or Locality  
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