Stevensite Mineral Data

Stevensite Mineral Data +

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General Stevensite Information

Chemical Formula:

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

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 19.11 % H₂O

Oxygen 54.32 % O

______ ______

100.00 % 101.07 % = TOTAL OXIDE

Empirical Formula:

Ca_0.15Na_0.33Mg_2.8Fe²⁺_0.2Si₄O₁₀(OH)₂·4(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1873

Locality:

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

Name Origin:

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

Synonym:

Cerolite

Jurupaite

Kerolite

Stevensite Image

Images:

Stevensite

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

Stevensite Crystallography

Axial Ratios:

a:b:c =0.5775:1:1.6798

Cell Dimensions:

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

Crystal System:

MonoclinicSpace Group: Unk (ORTH ?)

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

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

Physical Properties of Stevensite

Cleavage:

[001] Perfect

Color:

Beige white, Yellow brown, Pink.

Density:

2.15 - 2.75, Average = 2.45

Diaphaniety:

Translucent

Habit:

Fibrous - Crystals made up of fibers.

Habit:

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

Hardness:

4 - Fluorite

Luminescence:

Non-fluorescent.

Luster:

Resinous

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Stevensite

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

Optical Data:

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

Calculated Properties of Stevensite

Electron Density:

r_electron=2.49 gm/cc
note: r_Stevensite=2.45 gm/cc.

Fermion Index

Fermion Index = 0.02635
Boson Index = 0.97365

Photoelectric:

PE_Stevensite= 2.14 barns/electron
U=PE_Stevensite x r_electron= 5.32 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Stevensite is Not Radioactive

Stevensite Classification

Dana Class:

71.3.1b.6 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.3)with 2:1 clays

(71.3.1b)Smectite group (Trioctahedral Smectites)

71.3.1b.1 Sobotkite? (K,Ca0.5)0.33(Mg,Al)3(Si3Al)O10(OH)2·1-5(H2O) Unk. Mono

71.3.1b.2 Saponite (Ca/2,Na)0,3(Mg,Fe)3(Si,Al)4O10(OH)2·4(H2O) C 2/m 2/m

71.3.1b.2a Ferrosaponite! Ca0.3(Fe,Mg,Fe)3(Si,Al)4O10(OH)2·4(H2O) C? Mono

71.3.1b.3 Sauconite Na0,3Zn3(Si,Al)4O10(OH)2·4(H2O) C 2/m 2/m

71.3.1b.4 Hectorite Na0,3(Mg,Li)3Si4O10(OH)2 C 2/m 2/m

71.3.1b.5 Pimelite Ni3Si4O10(OH)2·4(H2O) Unk. Hex

71.3.1b.6 Stevensite (Ca0.5,Na)0.33(Mg,Fe)3Si4O10(OH)2·n(H2O) Unk (ORTH ?) Mono

71.3.1b.7 Yakhontovite (Ca,K)0.5(Cu,Fe,Mg)2Si4O10(OH)2·3(H2O) C 2/m 2/m

71.3.1b.8 Zincsilite Zn3Si4O10(OH)2·4(H2O)(?) C 2/m ? 2/m

Strunz Class:

VIII/H.20-40 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups

VIII/H.20 - Hectorite - Zincsilite series

VIII/H.20-10 Hectorite Na0,3(Mg,Li)3Si4O10(OH)2 C 2/m 2/m

VIII/H.20-20 Saponite (Ca/2,Na)0,3(Mg,Fe)3(Si,Al)4O10(OH)2·4(H2O) C 2/m 2/m

VIII/H.20-27 Ferrosaponite! Ca0.3(Fe,Mg,Fe)3(Si,Al)4O10(OH)2·4(H2O) C? Mono

VIII/H.20-30 Spadaite MgSiO2(OH)2·(H2O)(?) None

VIII/H.20-40 Stevensite (Ca0.5,Na)0.33(Mg,Fe)3Si4O10(OH)2·n(H2O) Unk (ORTH ?) Mono

VIII/H.20-50 Sauconite Na0,3Zn3(Si,Al)4O10(OH)2·4(H2O) C 2/m 2/m

VIII/H.20-60 Zincsilite Zn3Si4O10(OH)2·4(H2O)(?) C 2/m ? 2/m

Other Stevensite Information

References:

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

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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: 71.3.1b.6 Strunz No: VIII/H.20-40
Locality:

Notes: