Riversideite Mineral Data

General Riversideite Information

Chemical Formula:

Ca5Si6O16(OH)2•2(H2O)

Composition:

Molecular Weight = 694.94 gm

Calcium 28.84 % Ca 40.35 % CaO

Silicon 24.25 % Si 51.88 % SiO₂

Hydrogen 0.87 % H 7.78 % H₂O

Oxygen 46.05 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₅Si₆O₁₆(OH)₂•2(H₂O)

Environment:

Metamorphosed limestone.

IMA Status:

Valid Species (Pre-IMA) 1917

Locality:

Crestmore quarry, 5 miles NW of Riverside, Riverside Co., California. Link to MinDat.org Location Data.

Name Origin:

Named after it's locality.

Name Pronunciation:

Riversideite + Pronunciation

Riversideite Image

Images:

Riversideite

Comments: Opaque off-white finely fibrous riversideite veins in vesuvianite / grossular matrix.
Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Riversideite Crystallography

Axial Ratios:

a:b:c =1.53:1:5.1606

Cell Dimensions:

a = 5.571, b = 3.641, c = 18.79, Z = 1; V = 381.14 Den(Calc)= 3.03

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: B2212

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.014(1), 3.15(0.19), 2.784(0.18),

Physical Properties of Riversideite

Color:

White.

Density:

2.64

Diaphaneity:

Transparent to translucent

Habit:

Compact - Occurs as a compact mass.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Silky

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Riversideite

Gladstone-Dale:

CI meas= -0.041 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.093 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1987,KPDmeas= 0.228,KC= 0.2191
Ncalc = 1.58 - 1.66

Optical Data:

Biaxial (+), a=1.6, b=1.601, g=1.605, bire=0.0050

Calculated Properties of Riversideite

Electron Density:

Bulk Density (Electron Density)=2.66 gm/cc
note: Specific Gravity of Riversideite =2.64 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Riversideite= 4.45 barns/electron
U=PE_Riversideite x rElectron Density= 11.84 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Riversideite is Not Radioactive

Riversideite Classification

Dana Class:

72.03.02.04 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

(72.03)with 3-, 4-, or 5-membered rings and 8-membered rings

(72.03.02)Tobermorite group (5- & 8-membered rings)

72.03.02.01 Tobermorite Ca5Si6O16(OH)2•4(H2O) C 222₁ 2 2 2

72.03.02.02 Clinotobermorite Ca5Si6(O,OH)18•5(H2O) Cc,C 2/c Mono

72.03.02.03 Plombierite Ca5H2Si6O18•6H2O B11b 2

72.03.02.04 Riversideite Ca5Si6O16(OH)2•2(H2O) B2212 2 2 2

72.03.02.05 Okenite Ca3[Si6O15]•6(H2O) P1 or P1 Tri

72.03.02.06 Tacharanite Ca12Al2Si18O33(OH)36 A centered Mono

72.03.02.07 Nekoite Ca3Si6O15•7(H2O) P1 1

72.03.02.08 Oyelite Ca10B2Si8O29•12(H2O) B**** Ortho

Strunz Class:

09.DG.10 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DG -Inosilicates with 3-periodic single and multiple chains

09.DG.10 Clinotobermorite Ca5Si6(O,OH)18•5(H2O) Cc,C 2/c Mono

09.DG.10 Riversideite Ca5Si6O16(OH)2•2(H2O) B2212 2 2 2

09.DG.10 Tobermorite Ca5Si6O16(OH)2•4(H2O) C 222₁ 2 2 2

Other Riversideite Information

References:

NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Riversideite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Ask about Riversideite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Riversideite Specimen Label here :

Riversideite

Ca5Si6O16(OH)2•2(H2O)
Dana No: 72.03.02.04 Strunz No: 09.DG.10
Locality:

Notes: