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|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:||18.104.22.168|
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
Crystallography of Riversideite
|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 Å³ (Calculated from Unit Cell)|
Optical Data of Riversideite
|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.
|Dispersion:||r < v weak|
Chemical Properties of Riversideite
|Simplified for copy/paste:||Ca5(HSi3O9)2·2H2O|
|Essential elements:||Ca, H, O, Si|
|All elements listed in formula:||Ca, H, O, Si|
Relationship of Riversideite to other Species
|Member of:||Tobermorite Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Riversideite
|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
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
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.
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Locality Updated: Sierra Cuadrada Deposit, Paso de Indios Department, Chubut, ArgentinaFrom Raúl Jorge Tauber Larry, 24th Apr 2014 00:48:38