Greenalite Mineral Data (original) (raw)

General Greenalite Information

Help on Chemical Formula: Chemical Formula:

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

Help on Composition: 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

Help on Empirical Formula: Empirical Formula:

Fe2+2.3Fe3+0.5Si2.2O5(OH)3.3

Help on Environment: Environment:

A primary phase in some banded iron formations.

Help on IMA Status: IMA Status:

Valid Species (Pre-IMA) 1903

Help on Locality: Locality:

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

Help on Name Origin: Name Origin:

In allusion to its green color.

Help on Name Pronunciation: Name Pronunciation:

Greenalite + Pronunciation Say GREENALITE

Greenalite Image

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

Greenalite Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =0.5801:1:0.779

Help on Cell Dimensions: Cell Dimensions:

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

Help on Crystal System: Crystal System:

MonoclinicSpace Group: Unk

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 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),

Click Here for Large Greenalite Structure Window 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

Help on Cleavage: Cleavage:

None

Help on Color: Color:

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

Help on Density: Density:

2.85 - 3.15, Average = 3

Help on Diaphaneity: Diaphaneity:

Translucent to Subopaque

Help on Habit: Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Help on Habit: Habit:

Oolitic - < 3mm rounded spherical grains.

Help on Hardness: Hardness:

2.5 - Finger Nail

Help on Luster: Luster:

Earthy (Dull)

Help on Magnetism: Magnetism:

Moderately Magnetic

Help on Streak: Streak:

greenish gray

Optical Properties of Greenalite

Help on Gladstone-Dale: 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

Help on Optical Data: Optical Data:

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

Help on Pleochroism (x): Pleochroism (x):

pale yellow.

Help on Pleochroism (y): Pleochroism (y):

green.

Help on Pleochroism (z): Pleochroism (z):

green.

Calculated Properties of Greenalite

Help on Electron Density: Electron Density:

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

Help on Fermion Index: Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Help on Photoelectric: Photoelectric:

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

Help on Radioactivity: Radioactivity:

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

Greenalite Classification

Help on Dana Class: 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

Help on Strunz Class: 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

Help on References: References:

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

Help on See Also: 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: