General Amesite Information
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Chemical Formula: |
Mg2Al(SiAl)O5(OH)4 |
Composition: |
Molecular Weight = 278.68 gm |
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Magnesium 17.44 % Mg 28.92 % MgO |
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Aluminum 19.36 % Al 36.59 % Al2O3 |
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Silicon 10.08 % Si 21.56 % SiO2 |
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Hydrogen 1.45 % H 12.93 % H2O |
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Oxygen 51.67 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Mg2Al2SiO5(OH)4 |
Environment: |
A product of low-grade metamorphism of Al, Mg-rich rocks. |
IMA Status: |
Valid Species (Pre-IMA) 1876 |
Locality: |
At the Emery mine, Chester, Hampden Co., Massachusetts, USA. From the Lake Asbestos mine, Black Lake Link to MinDat.org Location Data. |
Name Origin: |
Honors James Ames, a mine owner. |
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Amesite Image |
Images:
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Images:
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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 |
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Amesite Crystallography
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Axial Ratios: |
a:b:c =0.5764:1:1.5632 |
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 |
Crystal System: |
Triclinic - PedialH-M Symbol (1) Space Group: C1 |
X Ray Diffraction: |
By Intensity(I/Io): 3.52(1), 7.06(1), 1.925(0.7), |
Crystal Structure:
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Help on Above
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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]
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Physical Properties of Amesite
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Cleavage: |
[001] Perfect |
Color: |
White, Light green. |
Density: |
2.77 |
Diaphaniety: |
Transparent to translucent |
Habit: |
Foliated - Two dimensional platy forms. |
Habit: |
Micaceous - Platy texture with "flexible" plates. |
Habit: |
Pseudo Hexagonal - Crystals show a hexagonal outline. |
Hardness: |
2.5-3 - Finger Nail-Calcite |
Luster: |
Pearly |
Streak: |
pale green |
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Optical Properties of Amesite
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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 |
Optical Data: |
Biaxial (+), a=1.597, b=1.597, g=1.612, bire=0.0150, 2V(Calc)=0, 2V(Meas)=0. |
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Calculated Properties of Amesite
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Electron Density: |
relectron=2.70 gm/cc note: rAmesite =2.69 gm/cc. |
Fermion Index |
Fermion Index = 0.02239 Boson Index = 0.97761 |
Photoelectric: |
PEAmesite = 1.37 barns/electron U=PEAmesite x relectron= 3.70 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Amesite is Not Radioactive |
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Amesite Classification
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Dana Class: |
71.1.2c.1 (71)Phyllosilicate Sheets of Six-Membered Rings |
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(71.1)with 1:1 layers |
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(71.1.2c)Serpentine group (Amesite subgroup) |
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71.1.2c.1 Amesite Mg2Al(SiAl)O5(OH)4 C1 1 |
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71.1.2c.2 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m |
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71.1.2c.3 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2 |
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71.1.2c.4 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m |
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71.1.2c.5 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 63 6 |
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71.1.2c.6 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1 |
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71.1.2c.7 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 31m 3m |
Strunz Class: |
VIII/H.27-100 VIII - Silicates |
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VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups |
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VIII/H.27 - Serpentine group |
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VIII/H.27-10 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m |
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VIII/H.27-20 Lizardite Mg3Si2O5(OH)4 P1 1 |
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VIII/H.27-30 Clinochrysotile Mg3Si2O5(OH)4 Cc, C 2/m Mono |
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VIII/H.27-40 Orthochrysotile Mg3Si2O5(OH)4 Unk Ortho |
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VIII/H.27-50 Parachrysotile Mg3Si2O5(OH)4 Unk Ortho |
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VIII/H.27-55 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono |
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VIII/H.27-60 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono |
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VIII/H.27-70 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m |
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VIII/H.27-80 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m |
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VIII/H.27-90 Zinalsite Zn2AlSi2O5(OH)4·2(H2O)(?) Mono |
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VIII/H.27-95 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m |
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VIII/H.27-100 Amesite Mg2Al(SiAl)O5(OH)4 C1 1 |
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VIII/H.27-110 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 63 6 |
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VIII/H.27-120 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 31m 3m |
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VIII/H.27-140 Karpinskite (Mg,Ni)2Si2O5(OH)2(?) Unk Mono |
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VIII/H.27-150 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2 |
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VIII/H.27-160 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m |
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VIII/H.27-170 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2 |
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VIII/H.27-180 Maufite (Mg,Ni)Al4Si3O13·4(H2O)(?) Mono ? Mono |
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VIII/H.27-190 Carlosturanite (Mg,Fe,Ti,Mn)21(Si,Al)12O28(OH)34 Cm m |
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Other Amesite Information
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References: |
NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) |
See Also: |
Links to other databases for Amesite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - Crocoite.com Mineral Locations
4 -Google Images
5 -Google Scholar
6 -Handbook of Mineralogy (MinSocAm)
7 -Handbook of Mineralogy (UofA)
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 - Mineral and Gemstone Kingdom
12 -Mineralienatlas (Deutsch)
13 -QUT Mineral Atlas
14 - WWW-MINCRYST
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Amesite
Mg2Al(SiAl)O5(OH)4
Dana No: 71.1.2c.1 Strunz No: VIII/H.27-100
Locality:
Notes:
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