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Riversideite

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Formula:
Ca
 
5
(HSi
 
3
O
 
9
)
 
2
· 2H
 
2
O
System:OrthorhombicColour:White
Hardness:3
Member of:Tobermorite Group
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

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/F.19-10
Nickel-Strunz 10th (pending) edition ID:9.DG.10

9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains
Dana 8th edition ID: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
Hey's CIM Ref.:14.5.19

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

Type Locality:Crestmore quarries, Crestmore, Riverside Co., California, USA
Year of Discovery:1917

Physical Properties of Riversideite

Lustre: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
Maximum Birefringence:δ = 0.005

Chart 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:
Ca
 
5
(HSi
 
3
O
 
9
)
 
2
· 2H
 
2
O
Simplified for copy/paste:Ca5(HSi3O9)2·2H2O
Essential elements:Ca, H, O, Si
All elements listed in formula:Ca, H, O, Si
Common Impurities:Ti,Al,Fe,Mg

Relationship of Riversideite to other Species

Member of:Tobermorite Group
Other Members of Group:

- +
Clinotobermorite
[Ca
 
4
Si
 
6
O
 
17
· 2H
 
2
O]·(Ca·3H
 
2
O)
Kenotobermorite
[Ca
 
4
Si
 
6
O
 
15
(OH)
 
2
·2H
 
2
O]·3H
 
2
O
Plombièrite
[Ca
 
4
Si
 
6
O
 
16
(OH)
 
2
· 2H
 
2
O]·(Ca·5H
 
2
O)
Tobermorite
[Ca
 
4
Si
 
6
O
 
17
) · 2H
 
2
O]·(Ca·3H
 
2
O)
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
 
4
Si
 
6
O
 
16
(OH)
 
2
· 2H
 
2
O]·(Ca·5H
 
2
O)
9.DG.10Clinotobermorite
[Ca
 
4
Si
 
6
O
 
17
· 2H
 
2
O]·(Ca·3H
 
2
O)
9.DG.10Tobermorite
[Ca
 
4
Si
 
6
O
 
17
) · 2H
 
2
O]·(Ca·3H
 
2
O)
9.DG.15Foshagite
Ca
 
4
(Si
 
3
O
 
9
)(OH)
 
2
9.DG.20Jennite
Ca
 
9
(Si
 
3
O
 
9
)
 
2
(OH)
 
8
· 8H
 
2
O
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
14.5.20Trabzonite
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
Si
 
6
O
 
17
) · 2H
 
2
O]·(Ca·3H
 
2
O)
14.5.24Clinotobermorite
[Ca
 
4
Si
 
6
O
 
17
· 2H
 
2
O]·(Ca·3H
 
2
O)
14.5.25Nekoite
Ca
 
3
Si
 
6
O
 
15
·7H
 
2
O
14.5.26Plombièrite
[Ca
 
4
Si
 
6
O
 
16
(OH)
 
2
· 2H
 
2
O]·(Ca·5H
 
2
O)
14.5.27Jennite
Ca
 
9
(Si
 
3
O
 
9
)
 
2
(OH)
 
8
· 8H
 
2
O

Other Names for Riversideite

Synonyms:
Tobermorite-9Å
Other Languages:
German:Riversideit
Spanish:Riversideita

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 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

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  • Raman and XRD data at RRUFF project [Link dead]
  • American Mineralogist Crystal Structure Database [Link dead]
  • Riversideite details from Handbook of Mineralogy (PDF) [Link dead]
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  • Localities for Riversideite

    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.
    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
     
    • California
      • Riverside Co.
        • Crestmore
    [Bull.Dept.Geol.Univ. California (1917) 10, 327-360 (347); [email protected]]
            • 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.
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