Amesite Mineral Data

Amesite Mineral Data
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General Amesite Information

Help on Chemical Formula: Chemical Formula: Mg2Al(SiAl)O5(OH)4
Help on Composition: Composition: Molecular Weight = 278.68 gm
   Magnesium  17.44 %  Mg   28.92 % MgO
   Aluminum   19.36 %  Al   36.59 % Al2O3
   Silicon    10.08 %  Si   21.56 % SiO2
   Hydrogen    1.45 %  H    12.93 % H2O
   Oxygen     51.67 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg2Al2SiO5(OH)4
Help on Environment: Environment: A product of low-grade metamorphism of Al, Mg-rich rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1876
Help on Locality: Locality: At the Emery mine, Chester, Hampden Co., Massachusetts, USA. From the Lake Asbestos mine, Black Lake Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Honors James Ames, a mine owner.
Help on Name Pronunciation: Name Pronunciation: Amesite Say AMESITE
 

Amesite Image

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Amesite

Comments: White, massive amesite between quartz.
Location: Missoula, Missoula County, Montana, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species
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Amesite   Titanite

Comments: Green titanite (sphene) crystals on purple chromamesite (clinochlore?).
Location: Saranovskaya Deposit, Middle Ural Mountains, Russia. Scale: Picture size 7 cm.
© Dave Barthelmy

Amesite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.5764:1:1.5632
Help on Cell Dimensions: Cell Dimensions: a = 5.31, b = 9.212, c = 14.401, Z = 4; alpha = 102.11°, beta = 90.2°, gamma = 90.1° V = 688.75 Den(Calc)= 2.69
Help on Crystal System: Crystal System: Triclinic - PedialH-M Symbol (1) Space Group: C1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.52(1), 7.06(1), 1.925(0.7),
Click Here for Large Amesite Structure Window Crystal Structure:

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 Help on Above


Anderson C S , Bailey S W , American Mineralogist , 66 (1981) p.185-195, A new cation ordering pattern in amesite-2H2

View Additional jPOWD Structure files for Amesite
[1]
 

Physical Properties of Amesite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: White, Light green.
Help on Density: Density: 2.77
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Habit: Habit: Foliated - Two dimensional platy forms.
Help on Habit: Habit: Micaceous - Platy texture with "flexible" plates.
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luster: Luster: Pearly
Help on Streak: Streak: pale green
 

Optical Properties of Amesite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.023 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2238,KPDmeas= 0.2173,KC= 0.2224
Ncalc = 1.6 - 1.62
Help on Optical Data: Optical Data: Biaxial (+), a=1.597, b=1.597, g=1.612, bire=0.0150, 2V(Calc)=0, 2V(Meas)=0.
 

Calculated Properties of Amesite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.70 gm/cc
note: Specific Gravity of Amesite =2.69 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEAmesite = 1.37 barns/electron
U=PEAmesite x rElectron Density= 3.70 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Amesite is Not Radioactive
 

Amesite Classification
Help on Dana Class: Dana Class: 71.01.02c.01 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.01)with 1:1 layers
  (71.01.02c)Serpentine group (Amesite subgroup)
 
71.01.02c.01 Amesite Mg2Al(SiAl)O5(OH)4 C1 1
 
71.01.02c.02 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m
 
71.01.02c.03 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2
 
71.01.02c.04 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m
 
71.01.02c.05 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 63 6
 
71.01.02c.06 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1
 
71.01.02c.07 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 31m 3m
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 Amesite Information
Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Amesite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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Print or Cut-and-Paste your Amesite Specimen Label here :

Amesite

Mg2Al(SiAl)O5(OH)4
Dana No: 71.01.02c.01 Strunz No: 09.ED.15
Locality:

 

Notes: