Greenalite Mineral Data +

Fabre Minerals

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+0.5Si2.2O5(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.
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
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),
Crystal Structure: Mouse drag1 - LMB Manipulate Structure drag2 - RMB Resize/Rotate Keyboard S - Stereo Pair on/off H - Help Screen I - Data Info A - Atoms On/Off P - Polyhedra On/Off B - Bonds On/Off Help on Above	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
Diaphaniety:	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
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:	relectron=3.01 gm/cc note: rGreenalite =3.08 gm/cc.
Fermion Index	Fermion Index = 0.01768 Boson Index = 0.98232
Photoelectric:	PEGreenalite = 13.80 barns/electron U=PEGreenalite x relectron= 41.59 barns/cc.
Radioactivity:	GRapi = 0 (Gamma Ray American Petroleum Institute Units) Greenalite is Not Radioactive
Greenalite Classification
Dana Class:	71.1.2b.4 (71)Phyllosilicate Sheets of Six-Membered Rings
	(71.1)with 1:1 layers
	(71.1.2b)Serpentine group (Lizardite subgroup)
	71.1.2b.1 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono
	71.1.2b.2 Lizardite Mg3Si2O5(OH)4 P1 1
	71.1.2b.3 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2
	71.1.2b.4 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono
Strunz Class:	VIII/H.27-60 VIII - Silicates
	VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups
	VIII/H.27 - Serpentine group
	VIII/H.27-10 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m
	VIII/H.27-20 Lizardite Mg3Si2O5(OH)4 P1 1
	VIII/H.27-30 Clinochrysotile Mg3Si2O5(OH)4 Cc, C 2/m Mono
	VIII/H.27-40 Orthochrysotile Mg3Si2O5(OH)4 Unk Ortho
	VIII/H.27-50 Parachrysotile Mg3Si2O5(OH)4 Unk Ortho
	VIII/H.27-55 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono
	VIII/H.27-60 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono
	VIII/H.27-70 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m
	VIII/H.27-80 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m
	VIII/H.27-90 Zinalsite Zn2AlSi2O5(OH)4·2(H2O)(?) Mono
	VIII/H.27-95 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m
	VIII/H.27-100 Amesite Mg2Al(SiAl)O5(OH)4 C1 1
	VIII/H.27-110 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 63 6
	VIII/H.27-120 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 31m 3m
	VIII/H.27-140 Karpinskite (Mg,Ni)2Si2O5(OH)2(?) Unk Mono
	VIII/H.27-150 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2
	VIII/H.27-160 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m
	VIII/H.27-170 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2
	VIII/H.27-180 Maufite (Mg,Ni)Al4Si3O13·4(H2O)(?) Mono ? Mono
	VIII/H.27-190 Carlosturanite (Mg,Fe,Ti,Mn)21(Si,Al)12O28(OH)34 Cm m
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 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (MinSocAm) 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 - Minerals of Wisconsin 14 -QUT Mineral Atlas 15 -École des Mines de Paris Search for Greenalite using:   Web webmineral.com [ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO] Visit our Advertisers for Greenalite : AA Mineral Specimens B & L Fine Minerals Dan Weinrich Fine Minerals Dan Weinrich Auctions e-Rocks Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals Rockshop.cz T G Fine Minerals Wrights Rock Shop Translate Greenalite Mineral Data : Ask about Greenalite here : Ask-A-Mineralogist from the Mineralogical Society of America Mindat.org's Discussion Groups Original Rockhounds Discussion Group Rockhounds Discussion Group on Yahoo Groups Mineral Discussion Forum from Fabre Minerals - also available in Español Print or Cut-and-Paste your Greenalite Specimen Label here : Greenalite (Fe++,Fe+++)2-3Si2O5(OH)4 Dana No: 71.1.2b.4 Strunz No: VIII/H.27-60 Locality:   Notes: