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Stevensite Mineral Data

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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

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  Stevensite

Comments: Granular massive stevensite.
Location: Langban, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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: Monoclinic Space 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:

 

 
   
 


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