Laumontite Mineral Data + Say LAUMONTITE

General Laumontite Information
Help on Chemical Formula: Chemical Formula: CaAl2Si4O12·4(H2O)
Help on Composition: Composition: Molecular Weight = 470.44 gm
   Calcium    8.52 %  Ca   11.92 % CaO
   Aluminum  11.47 %  Al   21.67 % Al2O3
   Silicon   23.88 %  Si   51.09 % SiO2
   Hydrogen   1.71 %  H    15.32 % H2O
   Oxygen    54.42 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaAl2Si4O12·4(H2O)
Help on Environment: Environment: Secondary mineral in basalts and andesites. Also occurs in metamorphic rocks and granites. Found in copper veins.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1801
Help on Locality: Locality: Nagy-Ag, Transylvania of Romania. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Frenchman, F. P. N. de Laumont (1747-1834).
Help on Synonym: Synonym: Aedelforsite
  Caporcianite
  ICSD 72914
  Leonhardite
  Lomonite
  PDF 45-1325
 

Laumontite Image

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Laumontite

Comments: Diamond-shaped prism of laumontite with chrysocolla.
Location: Azurite mine, Pinal County, Arizona, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals
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Laumontite

Comments: White, well developed laumontite crystals up to 1 cm. on matrix.
Location: Osilo, Sardegna, Italy. Scale: Specimen size 6 x 4.5 cm.
© Minernet

Laumontite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.1313:1:0.5732
Help on Cell Dimensions: Cell Dimensions: a = 14.9, b = 13.17, c = 7.55, Z = 4; beta = 111.5° V = 1,378.47 Den(Calc)= 2.27
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.49(1), 4.156(0.6), 6.86(0.35),
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Fridriksson T , Bish D L , Bird D K , American Mineralogist , 88 (2003) p.277-287, Hydrogen-bonded water in laumontite I: X-ray powder diffraction, study of water site occupancy and structural changes in laumontite, during room-temperature isothermal hydration/dehydration, Sample: P = 0.11 mbar PH2O

View Additional jPOWD Structure files for Laumontite
[1] [10] [11] [12] [13] [14] [15] [2] [3] [4] [5] [6] [7] [8] [9]
 

Physical Properties of Laumontite

Help on Cleavage: Cleavage: [010] Perfect, [110] Perfect
Help on Color: Color: Brownish, Gray, Yellowish, Pearl white, Pink.
Help on Density: Density: 2.25 - 2.35, Average = 2.29
Help on Diaphaniety: Diaphaniety: Transparent to translucent to opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Laumontite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2274,KPDmeas= 0.2244,KC= 0.2282
Help on Optical Data: Optical Data: Biaxial (-), a=1.502-1.519, b=1.512-1.525, g=1.513-1.526, bire=0.0070-0.0110, 2V(Calc)=34-44, 2V(Meas)=25-47. Dispersion marked to extreme, r < v.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Laumontite

Help on Electron Density: Electron Density:

relectron=2.30 gm/cc
note: rLaumontite =2.27 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.01153
Boson Index = 0.98847
Help on Photoelectric: Photoelectric:

PELaumontite = 2.32 barns/electron
U=PELaumontite x relectron= 5.33 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Laumontite is Not Radioactive
 

Laumontite Classification
Help on Dana Class: Dana Class: 77.1.1.4 (77)Tectosilicate Zeolite group
  (77.1)true zeolites
  (77.1.1)Analcime and related species
 
77.1.1.1 Analcime NaAlSi2O6·(H2O) P1 1
 
77.1.1.2 Pollucite (Cs,Na)2Al2Si4O12·(H2O) I a3d 4/m 3 2/m
 
77.1.1.3 Wairakite CaAl2Si4O12·2(H2O) I2/a 2/m
 
77.1.1.4 Laumontite CaAl2Si4O12·4(H2O) C 2/m 2/m
 
77.1.1.5 Hsianghualite Ca3Li2Be3(SiO4)3F2 I 213 2 3
Help on Strunz Class: Strunz Class: VIII/J.22-50 VIII - Silicates
  VIII/J - Tectosilicates (network), with zeolite-structure, Bladed Zeolites
  VIII/J.22 - Zeolite group, Ferrierite - Laumontite series
 
VIII/J.22-01 Ferrierite-Na! (Na,K)2Mg(Si,Al)18O36·9(H2O) P 21/n 2/m 2/m 2/m
 
VIII/J.22-03 Ferrierite-K! (K,Na)2Mg(Si,Al)18O36·9(H2O) Pnnm 2/m 2/m 2/m
 
VIII/J.22-05 Ferrierite-Mg (Mg,Na,K)2Mg(Si,Al)18O36·9(H2O) Pnnm 2/m 2/m 2/m
 
VIII/J.22-06 Mutinaite! Na3Ca4Si85Al11O192·60(H2O) P nma 2/m 2/m 2/m
 
VIII/J.22-07 Terranovaite! (Na,Ca)8(Si68Al12)O160-29(H2O) C mcm 2/m 2/m 2/m
 
VIII/J.22-08 Gottardiite! Na3Mg3Ca5Al19Si117O272·93(H2O) C mca 2/m 2/m 2/m
 
VIII/J.22-10 Boggsite NaCa2(Al5Si19O48)·17(H2O) I mma 2/m 2/m 2/m
 
VIII/J.22-15 Dachiardite-Na (Na2,Ca,K2)4Al4Si20O48·13(H2O) C 2/m 2/m
 
VIII/J.22-20 Dachiardite-Ca (Ca,Na2,K2)5Al10Si38O96·25(H2O) C 2/m 2/m
 
VIII/J.22-30 Mordenite (Ca,Na2,K2)Al2Si10O24·7(H2O) C mc21 mm2
 
VIII/J.22-40 Edingtonite BaAl2Si3O10·4(H2O) P 21212 2 2 2
 
VIII/J.22-50 Laumontite CaAl2Si4O12·4(H2O) C 2/m 2/m
 

Other Laumontite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Laumontite :
1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Applied Mineralogy 4 -Athena 5 - Crocoite.com Mineral Locations 6 - EUROmin Project 7 - Franklin Minerals(Dunn) 8 -Google Images 9 -Google Scholar 10 -Handbook of Mineralogy (MinSocAm) 11 -Handbook of Mineralogy (UofA) 12 -MinDAT 13 -MinMax(Deutsch) 14 -MinMax(English) 15 -Mineralienatlas (Deutsch) 16 - Minerals of Wisconsin 17 - Philatelic Mineralogy 18 -QUT Mineral Atlas 19 - WWW-MINCRYST 20 -Zeolite Database by Bruno Herreros 21 -École des Mines de Paris

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Laumontite

CaAl2Si4O12·4(H2O)
Dana No: 77.1.1.4 Strunz No: VIII/J.22-50
Locality:

 

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