Greenalite Mineral Data

General Greenalite Information

Chemical Formula:

(Fe++,Fe+++)2-3Si2O5(OH)4

Composition:

Molecular Weight = 354.28 gm

Iron 44.14 % Fe 46.64 % FeO / 11.27 % Fe₂O₃

Silicon 17.44 % Si 37.31 % SiO₂

Hydrogen 0.94 % H 8.39 % H₂O

Oxygen 37.48 % O

______ ______

100.00 % 103.61 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_2.3Fe³⁺_0.5Si_2.2O₅(OH)_3.3

Environment:

A primary phase in some banded iron formations.

IMA Status:

Valid Species (Pre-IMA) 1903

Locality:

Biwabik Iron Formation, Mesabi Range, Minnesota, USA. Link to MinDat.org Location Data.

Name Origin:

In allusion to its green color.

Name Pronunciation:

Greenalite + Pronunciation

Greenalite Image

Images:

Greenalite

Comments: Dark olive-green massive greenalite with metallic galena.
Location: La Union Mine, Murcia, Spain. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Greenalite Crystallography

Axial Ratios:

a:b:c =0.5801:1:0.779

Cell Dimensions:

a = 5.54, b = 9.55, c = 7.44, Z = 2; beta = 104.2° V = 381.60 Den(Calc)= 3.08

Crystal System:

MonoclinicSpace Group: Unk

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

By Intensity(I/I_o): 2.571(1), 7.12(0.8), 3.559(0.8),1.593(0.6), 1.553(0.4), 2.184(0.4), 2.849(0.2),

Crystal Structure:

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Shirozu H , Bailey S W , American Mineralogist , 50 (1965) p.868-885, Chlorite polytypism: III. Crystal structure of an orthohexagonal iron chlorite

Physical Properties of Greenalite

Cleavage:

None

Color:

Blue green, Light yellow green, Dark green, Black.

Density:

2.85 - 3.15, Average = 3

Diaphaneity:

Translucent to Subopaque

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Oolitic - < 3mm rounded spherical grains.

Hardness:

2.5 - Finger Nail

Luster:

Earthy (Dull)

Magnetism:

Moderately Magnetic

Streak:

greenish gray

Optical Properties of Greenalite

Gladstone-Dale:

CI meas= 0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.051 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2176,KPDmeas= 0.2234,KC= 0.2293
Ncalc = 1.65 - 1.72

Optical Data:

Biaxial (+), a=1.65-1.675, b=1.674, g=1.674, bire=0.0010-0.0240, 2V(Meas)=0.

Pleochroism (x):

pale yellow.

Pleochroism (y):

green.

Pleochroism (z):

green.

Calculated Properties of Greenalite

Electron Density:

Bulk Density (Electron Density)=2.93 gm/cc
note: Specific Gravity of Greenalite =3.00 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Greenalite= 13.80 barns/electron
U=PE_Greenalite x rElectron Density= 40.51 barns/cc.

Radioactivity:

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

Greenalite Classification

Dana Class:

71.01.02b.04 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.01)with 1:1 layers

(71.01.02b)Serpentine group (Lizardite subgroup)

71.01.02b.01 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono

71.01.02b.02 Lizardite Mg3Si2O5(OH)4 P1 1

71.01.02b.03 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2

71.01.02b.04 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono

Strunz Class:

09.ED.15 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.ED -Phyllosilicates with kaolinite layers

09.ED.15 Clinochrysotile? Mg3Si2O5(OH)4 Cc, C 2/m Mono

09.ED.15 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m

09.ED.15 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2

09.ED.15 Amesite Mg2Al(SiAl)O5(OH)4 C1 1

09.ED.15 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m

09.ED.15 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono

09.ED.15 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m

09.ED.15 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 3₁m 3m

09.ED.15 Chrysotile Mg3Si2O5(OH)4 A2/m 2/m

09.ED.15 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2

09.ED.15 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono

09.ED.15 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 6₃ 6

09.ED.15 Maufite? (Mg,Ni)Al4Si3O13•4(H2O)(?) Mono ? Mono

09.ED.15 Lizardite Mg3Si2O5(OH)4 P1 1

09.ED.15 Orthochrysotile? Mg3Si2O5(OH)4 Unk Ortho

09.ED.15 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1

09.ED.15 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m

09.ED.15 Parachrysotile? Mg3Si2O5(OH)4 Unk Ortho

Other Greenalite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(Heinrich65)

See Also:

Links to other databases for Greenalite :
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 Greenalite Specimen Label here :

Greenalite

(Fe++,Fe+++)2-3Si2O5(OH)4
Dana No: 71.01.02b.04 Strunz No: 09.ED.15
Locality:

Notes: