Mineralogy Database

Lourenswalsite Mineral Data

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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.
Help on Name Pronunciation: Name Pronunciation: Lourenswalsite + Pronunciation Say LOURENSWALSITE

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: Hexagonal Space 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 Diaphaneity: Diaphaneity: 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= 0.037 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.043 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2607,KPDmeas= 0.2624,KC= 0.2723
Ncalc = 1.86 - 1.87
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: Bulk Density (Electron Density)=3.09 gm/cc
note: Specific Gravity of Lourenswalsite =3.17 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
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)
Concentration of Lourenswalsite per GRapi unit = 1.42 (%)

Estimated Radioactivity from Lourenswalsite - barely detectable


Lourenswalsite Classification

Help on  Dana Class: Dana Class: (61)Cyclosilicate Six-Membered Rings
  (61.02)with Al substituted rings
  (61.02.03)Dana Group 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: 09.EJ.05 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EJ -Unclassified phyllosilicates
09.EJ.05 Lourenswalsite (K,Ba)2(Ti,Mg,Ca,Fe)4(Si,Al,Fe)6O14(OH)12 Unk (pseudo-HEX) Hex

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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.EJ.05





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