Lawsonite Mineral Data + Say LAWSONITE

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General Lawsonite Information

Help on Chemical  Formula: Chemical Formula: CaAl2Si2O7(OH)2·(H2O)
Help on Composition: Composition: Molecular Weight = 314.24 gm
   Calcium   12.75 %  Ca   17.85 % CaO
   Aluminum  17.17 %  Al   32.45 % Al2O3
   Silicon   17.88 %  Si   38.24 % SiO2
   Hydrogen   1.28 %  H    11.47 % H2O
   Oxygen    50.91 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaAl2Si2O7(OH)2·(H2O)
Help on Environment: Environment: Originally described from a crystalline schist associated with serpentine. Also found as a secondary mineral in altered gabbros and diorites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1895
Help on Locality: Locality: Reed Station, Tiburon peninsula, Marin County, California, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Andrew Cowper Lawson (1861-1952), Scottish-American geologist.
Help on Synonym: Synonym: ICSD 80835
  PDF 13-533
 

Lawsonite Image

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Lawsonite

Comments: Glaucophane schist with a heavy druse of lawsonite crystals.
Location: Reed Station, Tiburon, Marin County, California, USA. Scale: Crystal size 7 mm.
© John Veevaert

Lawsonite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.5051:1:2.2488
Help on Cell Dimensions: Cell Dimensions: a = 8.79, b = 5.84, c = 13.133, Z = 4; V = 674.16 Den(Calc)= 3.10
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Ccmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.624(1), 1.55(0.8), 2.726(0.7),
Click Here for Large Lawsonite Structure Window Crystal Structure:

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Baur W H , American Mineralogist , 63 (1978) p.311-315, Crystal structure refinement of lawsonite, Locality: Tiburon Peninsula, Marin County, California, USA

View Additional jPOWD Structure files for Lawsonite
[1] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [2] [20] [21] [22] [23] [24] [3] [4] [5] [6] [7] [8] [9]
 

Physical Properties of Lawsonite

Help on Cleavage: Cleavage: [010] Perfect, [001] Perfect, [110] Poor
Help on Color: Color: Colorless, White, Gray, Blue, Pinkish.
Help on Density: Density: 3.09
Help on Diaphaniety: Diaphaniety: Translucent to transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 7.5 - Garnet
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Vitreous - Greasy
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Lawsonite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.025 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2176,KPDmeas= 0.2183,KC= 0.2232
Help on Optical Data: Optical Data: Biaxial (+), a=1.665, b=1.672-1.676, g=1.684-1.686, bire=0.0190-0.0210, 2V(Calc)=76-86, 2V(Meas)=84-85. Dispersion strong, r > v.
Help on Pleochroism (x): Pleochroism (x): colorless or blue.
Help on Pleochroism (y): Pleochroism (y): colorless or yellow.
Help on Pleochroism (z): Pleochroism (z): colorless or colorless.
 

Calculated Properties of Lawsonite

Help on Electron Density: Electron Density:

relectron=3.11 gm/cc
note: rLawsonite =3.09 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00876
Boson Index = 0.99124
Help on Photoelectric: Photoelectric:

PELawsonite = 2.77 barns/electron
U=PELawsonite x relectron= 8.60 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lawsonite is Not Radioactive

 

Lawsonite Classification

Help on  Dana Class: Dana Class: 56.2.3.1 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.2)with cations in [4] and/or >[4] coordination
  (56.2.3)Lawsonite - Ilvaite group
 
56.2.3.1 Lawsonite CaAl2Si2O7(OH)2·(H2O) Ccmm 2/m 2/m 2/m
 
56.2.3.2 Hennomartinite SrMn2Si2O7(OH)2·(H2O) C mcm 2/m 2/m 2/m
 
56.2.3.3 Ilvaite CaFe2FeSi2O7O(OH) Pbnm 2/m 2/m 2/m
 
56.2.3.4 Noelbensonite! BaMn2(Si2O7)(OH)2·(H2O) C mcm 2/m 2/m 2/m
 
56.2.3.5 Itoigawaite! SrAl2Si2O7(OH)2·(H2O) C mcm 2/m 2/m 2/m
 
56.2.3.6 IMA2002-016! CaFeFe(Mn,Fe)(Si2O7)O(OH) P 21/a 2/m
Help on  Strunz Class: Strunz Class: VIII/C.10-10 VIII - Silicates
  VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]
  VIII/C.10 - Lawsonite - Ilvaite series
 
VIII/C.10-10 Lawsonite CaAl2Si2O7(OH)2·(H2O) Ccmm 2/m 2/m 2/m
 
VIII/C.10-12 Itoigawaite! SrAl2Si2O7(OH)2·(H2O) C mcm 2/m 2/m 2/m
 
VIII/C.10-15 Hennomartinite SrMn2Si2O7(OH)2·(H2O) C mcm 2/m 2/m 2/m
 
VIII/C.10-17 Noelbensonite! BaMn2(Si2O7)(OH)2·(H2O) C mcm 2/m 2/m 2/m
 
VIII/C.10-20 Ilvaite CaFe2FeSi2O7O(OH) Pbnm 2/m 2/m 2/m
 

Other Lawsonite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Lawsonite :
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 in Thin Sections-Humboldt State 14 -QUT Mineral Atlas 15 - University of Manchester - Mineral Structure 16 - WWW-MINCRYST 17 -École des Mines de Paris

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

Lawsonite

CaAl2Si2O7(OH)2·(H2O)
Dana No: 56.2.3.1 Strunz No: VIII/C.10-10
Locality:

 

Notes:

 

 
   
 
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