Stevensite Mineral Data (original) (raw)

General Stevensite Information

Help on Chemical Formula: Chemical Formula:

(Ca0.5,Na)0.33(Mg,Fe++)3Si4O10(OH)2•n(H2O)

Help on Composition: Composition:

Molecular Weight = 471.23 gm

Sodium 1.61 % Na 2.17 % Na2O

Calcium 1.28 % Ca 1.79 % CaO

Magnesium 14.44 % Mg 23.95 % MgO

Iron 2.37 % Fe 3.05 % FeO

Silicon 23.84 % Si 51.00 % SiO2

Hydrogen 2.14 % H 19.12 % H2O

Oxygen 54.32 % O

______ ______

100.00 % 101.07 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

Ca0.15Na0.33Mg2.8Fe2+0.2Si4O10(OH)2•4(H2O)

Help on IMA Status: IMA Status:

Valid Species (Pre-IMA) 1873

Help on Locality: Locality:

Railway tunnel, Bergen Hill, Hudson County, New Jersey, USA. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for E. A. Stevens, founder of Stevens Institute of Technology, Hoboken, New Jersey, USA.

Help on Name Pronunciation: Name Pronunciation:

Stevensite + Pronunciation Say STEVENSITE

Help on Synonym: Synonym:

Cerolite

Jurupaite

Kerolite

Stevensite Image

Click Here for Larger Stevensite Image in a New Browser Window Images:

Stevensite Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =0.5775:1:1.6798

Help on Cell Dimensions: Cell Dimensions:

a = 5.26, b = 9.108, c = 15.3, Z = 2; beta = 90° V = 732.99 Den(Calc)= 2.13

Help on Crystal System: Crystal System:

MonoclinicSpace Group: Unk (ORTH ?)

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 15.5(1), 4.53(0.35), 1.518(0.15),

Physical Properties of Stevensite

Help on Cleavage: Cleavage:

{001} Perfect

Help on Color: Color:

Beige white, Yellow brown, Pink.

Help on Density: Density:

2.15 - 2.75, Average = 2.45

Help on Diaphaneity: Diaphaneity:

Translucent

Help on Habit: Habit:

Fibrous - Crystals made up of fibers.

Help on Habit: Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Help on Hardness: Hardness:

4 - Fluorite

Help on Luminescence: Luminescence:

Non-fluorescent.

Help on Luster: Luster:

Resinous

Help on Magnetism: Magnetism:

Nonmagnetic

Help on Streak: Streak:

white

Optical Properties of Stevensite

Help on Gladstone-Dale: Gladstone-Dale:

CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.137 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2645,KPDmeas= 0.2299,KC= 0.2326
Ncalc = 1.5 - 1.64

Help on Optical Data: Optical Data:

Biaxial (+), a=1.56, b=1.56, g=1.57, bire=0.0100

Calculated Properties of Stevensite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=2.49 gm/cc
note: Specific Gravity of Stevensite =2.45 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Help on Photoelectric: Photoelectric:

PEStevensite = 2.14 barns/electron
U=PEStevensite x rElectron Density= 5.32 barns/cc.

Help on Radioactivity: Radioactivity:

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

Stevensite Classification

Help on Dana Class: Dana Class:

71.03.01b.06 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.03)with 2:1 clays

(71.03.01b)Smectite group (Trioctahedral Smectites)

71.03.01b.01 Sobotkite? (K,Ca0.5)0.33(Mg,Al)3(Si3Al)O10(OH)2•1-5(H2O) Unk. Mono

71.03.01b.02 Saponite (Ca/2,Na)0,3(Mg,Fe)3(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m

71.03.01b.02a Ferrosaponite! Ca0.3(Fe,Mg,Fe)3(Si,Al)4O10(OH)2•4(H2O) C? Mono

71.03.01b.03 Sauconite Na0,3Zn3(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m

71.03.01b.04 Hectorite Na0,3(Mg,Li)3Si4O10(OH)2 C 2/m 2/m

71.03.01b.05 Pimelite? Ni3Si4O10(OH)2•4(H2O) Unk. Hex

71.03.01b.06 Stevensite (Ca0.5,Na)0.33(Mg,Fe)3Si4O10(OH)2•n(H2O) Unk (ORTH ?) Mono

71.03.01b.07 Yakhontovite (Ca,K)0.5(Cu,Fe,Mg)2Si4O10(OH)2•3(H2O) C 2/m 2/m

71.03.01b.08 Zincsilite Zn3Si4O10(OH)2•4(H2O)(?) C 2/m ? 2/m

Help on Strunz Class: Strunz Class:

09.EC.45 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets

09.EC.45 Griffithite* 4(Mg,Fe,Ca)O.(Al,Fe)2O3.5SiO2•7(H2O) Mono

09.EC.45 Hectorite Na0,3(Mg,Li)3Si4O10(OH)2 C 2/m 2/m

09.EC.45 Swinefordite (Li,Ca0.5,Na)0.72(Li,Al,Mg)2.66(Si,Al)4O10(OH,F)2•2(H2O) C 2/m (MON or ORTH) 2/m

09.EC.45 Zincsilite Zn3Si4O10(OH)2•4(H2O)(?) C 2/m ? 2/m

09.EC.45 Saponite (Ca/2,Na)0,3(Mg,Fe)3(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m

09.EC.45 Sauconite Na0,3Zn3(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m

09.EC.45 Spadaite MgSiO2(OH)2•(H2O)(?) Ortho

09.EC.45 Sobotkite? (K,Ca0.5)0.33(Mg,Al)3(Si3Al)O10(OH)2•1-5(H2O) Unk. Mono

09.EC.45 Stevensite (Ca0.5,Na)0.33(Mg,Fe)3Si4O10(OH)2•n(H2O) Unk (ORTH ?) Mono

09.EC.45 Ferrosaponite! Ca0.3(Fe,Mg,Fe)3(Si,Al)4O10(OH)2•4(H2O) C? Mono

Other Stevensite Information

Help on References: References:

PHYS. PROP.(Dana8) OPTIC PROP.(Dana)

Help on See Also: See Also:

Links to other databases for Stevensite :
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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Print or Cut-and-Paste your Stevensite Specimen Label here :

Stevensite

(Ca0.5,Na)0.33(Mg,Fe++)3Si4O10(OH)2•n(H2O)
Dana No: 71.03.01b.06 Strunz No: 09.EC.45
Locality:

Notes: