Lourenswalsite Mineral Data + Say LOURENSWALSITE


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General Lourenswalsite Information

Help on Chemical  Formula: Chemical Formula: (K,Ba)2(Ti,Mg,Ca,Fe)4(Si,Al,Fe)6O14(OH)12
Help on Composition: Composition: Molecular Weight = 937.50 gm
   Potassium   5.00 %  K     6.03 % K2O
   Barium     10.25 %  Ba   11.45 % BaO
   Calcium     0.43 %  Ca    0.60 % CaO
   Magnesium   1.04 %  Mg    1.72 % MgO
   Titanium   17.36 %  Ti   28.97 % TiO2
   Aluminum    2.88 %  Al    5.44 % Al2O3
   Iron        4.17 %  Fe    0.77 % FeO /  5.11 % Fe2O3
   Silicon    13.18 %  Si   28.20 % SiO2
   Hydrogen    1.31 %  H    11.72 % H2O
   Oxygen     44.37 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K1.2Ba0.7Ti3.4Mg0.4Ca0.1Fe2+0.1Si4.4AlFe3+0.6O19.9(H2O)6.1
Help on Environment: Environment: Oxidizing conditions.
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: Diamond Jo quarry, Magnet Cove, near Hot Springs, Arkansas, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Lourens Wals (1939-), a leading Belgian mineral collector.
 

Lourenswalsite Image

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Lourenswalsite   Aegirine

Comments: Light brownish rosettes of lourenswalsite with dark green crystals of aegirine and white feldspar.
Location: Diamond Jo quarry, Magnet Cove, Hot Springs Co., Arkansas, USA. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Lourenswalsite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:3.90732
Help on Cell Dimensions: Cell Dimensions: a = 5.244, c = 20.49, Z = 1; V = 487.98 Den(Calc)= 3.19
Help on Crystal System: Crystal System: HexagonalSpace Group: Unk (pseudo-HEX)
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.608(1), 1.515(0.8), 1.3111(0.25),
 

Physical Properties of Lourenswalsite

Help on Cleavage: Cleavage: [001] Good
Help on Color: Color: Brownish gray, Pearl gray.
Help on Density: Density: 3.17
Help on Diaphaniety: Diaphaniety: Translucent
Help on Fracture: Fracture: Friable - The crumbly disintegration of earthy materials or highly fractured minerals.
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Habit: Habit: Rosette - Bundled tabular aggregates resembling rose flower petals.
Help on Luster: Luster: Pearly
Help on Streak: Streak: gray white
 

Optical Properties of Lourenswalsite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2607,KPDmeas= 0.2624,KC= 0.2709
Help on Optical Data: Optical Data: Biaxial (-), a=1.815, b=1.84, g=1.84, bire=0.0250
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): none.
Help on Pleochroism (z): Pleochroism (z): none.
 

Calculated Properties of Lourenswalsite

Help on Electron Density: Electron Density:

relectron=3.09 gm/cc
note: rLourenswalsite =3.17 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.04902
Boson Index = 0.95098
Help on Photoelectric: Photoelectric:

PELourenswalsite = 47.51 barns/electron
U=PELourenswalsite x relectron= 146.70 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 70.32 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Lourenswalsite - barely detectable

 

Lourenswalsite Classification

Help on  Dana Class: Dana Class: 61.2.3.1 (61)Cyclosilicate Six-Membered Rings
  (61.2)with Al substituted rings
  (61.2.3)Dana Group
 
61.2.3.1 Lourenswalsite (K,Ba)2(Ti,Mg,Ca,Fe)4(Si,Al,Fe)6O14(OH)12 Unk (pseudo-HEX) Hex
Help on  Strunz Class: Strunz Class: VIII/H.38-80 VIII - Silicates
  VIII/H - Phyllosilicates (layered) Mica minerals with tetrahedral-double layers and related structures
  VIII/H.38 - Monteregianite-(Y) - Wickenburgite series
 
VIII/H.38-10 Monteregianite-(Y) (Na,K)6(Y,Ca)2Si16O38·10(H2O) P 21/m 2/m
 
VIII/H.38-20 Rhodesite KHCa2Si8O19·5(H2O) Pmam 2/m 2/m 2/m
 
VIII/H.38-30 Delhayelite (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3·18(H2O) Pnmm 2/m 2/m 2/m
 
VIII/H.38-40 Hydrodelhayelite KCa2AlSi7O17(OH)2·6(H2O) Pnm21 mm2
 
VIII/H.38-50 Macdonaldite BaCa4[Si16O36(OH)2]·10(H2O) C mcm 2/m 2/m 2/m
 
VIII/H.38-60 Cymrite BaAl2Si2O8·(H2O) P 21 (pseudo-HEX) 2
 
VIII/H.38-65 Kampfite! Ba6[(Si,Al)O2]8(CO3)2Cl2(Cl,H2O)2 P 63mmc, P 62c, P 63mc, P 31 Hex
 
VIII/H.38-80 Lourenswalsite (K,Ba)2(Ti,Mg,Ca,Fe)4(Si,Al,Fe)6O14(OH)12 Unk (pseudo-HEX) Hex
 
VIII/H.38-90 Wickenburgite Pb3CaAl2Si10O27·4(H2O) P 31c 3m
 

Other Lourenswalsite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Lourenswalsite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 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 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Lourenswalsite

(K,Ba)2(Ti,Mg,Ca,Fe)4(Si,Al,Fe)6O14(OH)12
Dana No: 61.2.3.1 Strunz No: VIII/H.38-80
Locality:

 

Notes:

 

 
   
 
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