Lecontite  Mineral Data

Lecontite Mineral Data

Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images Share
      News Help About

Advertisment
WE BUY COLLECTIONS & SINGLE IMPORTANT SPECIMENS

General Lecontite Information

Help on Chemical  Formula: Chemical Formula: (NH4,K)Na(SO4)•2(H2O)
Help on Composition: Composition: Molecular Weight = 178.39 gm
   Potassium   5.48 %  K     6.60 % K2O
   Sodium     12.89 %  Na   17.37 % Na2O
   Hydrogen    1.70 %  H      -   % Calc as (NH4)2O
   Hydrogen    2.26 %  H    20.20 % H2O
   Sulfur     17.98 %  S    44.88 % SO3
   Nitrogen    5.89 %  N    10.95 % (NH4)2O
   Oxygen     53.81 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (NH4)0.75K0.25Na(SO4)•2(H2O)
Help on Environment: Environment: Early product of the breakdown of bat guano.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1858
Help on Locality: Locality: Las Piedras Cave, near Comayagua, 62 km northwest of Tegucigalpa, Honduras. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for John Lawrence LeConte (1825-1883), American entomologist, University of California, Berkeley, California, USA, who discovered the mineral.
Help on Name Pronunciation: Name Pronunciation: Lecontite + Pronunciation Say LECONTITE
Help on Synonym: Synonym: ICSD 77896
  PDF 15-283
 

Lecontite Image

Click Here for Larger Lecontite Image in a New Browser Window Images:
Click Here for Larger Lecontite Image

Lecontite   Mascagnite

Comments: SEM BSE image of fine-grained lecontite (Le) and thenardite, occupying the space between mascagnite (M) crystals. CanMin 47:573.
Location: Coal-waste heap in Avion, northern France, that has been undergoing subsurface combustion for several decades. Scale: See Image.
© Canadian Mineralogist

Lecontite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6412:1:0.4856
Help on Cell Dimensions: Cell Dimensions: a = 8.24, b = 12.85, c = 6.24, Z = 4; V = 660.72 Den(Calc)= 1.79
Help on Crystal System: Crystal System: Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 212121
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.068(1), 3.802(0.94), 3.033(0.89),
Click Here for Large Lecontite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate

Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above


Arzt S , Glazer A M , Acta Crystallographica, Section B , 50 (1994) p.425-431, The optical activity and absolute optical chirality of NaNH4SO4*2H2O, Locality: synthetic

 

Physical Properties of Lecontite

Help on Cleavage: Cleavage: {011} Distinct
Help on Color: Color: Colorless.
Help on Density: Density: 1.745
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Lecontite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.328 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.295 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2512,KPDmeas= 0.2577,KC= 0.1941
Ncalc = 1.34 - 1.35
Help on Optical Data: Optical Data: Biaxial (-), a=1.44, b=1.454, g=1.455, bire=0.0150, 2V(Calc)=28, 2V(Meas)=29.74.
 

Calculated Properties of Lecontite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.85 gm/cc
note: Specific Gravity of Lecontite =1.79 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PELecontite = 1.87 barns/electron
U=PELecontite x relectron= 3.46 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 81.53 (Gamma Ray American Petroleum Institute Units)
Concentration of Lecontite per GRapi unit = 1.23 (%)

Estimated Radioactivity from Lecontite - barely detectable

 

Lecontite Classification

Help on  Dana Class: Dana Class: 29.02.01.01 (29)Hydrated Acid and Sulfates
  (29.02)where (A+)2 XO4 · x(H2O)
  (29.02.01)Dana Group
 
29.02.01.01 Lecontite (NH4,K)Na(SO4)•2(H2O) P 212121 2 2 2
Help on  Strunz Class: Strunz Class: 07.CD.15 07 - SULFATES (SELENATES, TELLURATES)
  07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
  07.CD -With only large cations
 
07.CD.15 Lecontite (NH4,K)Na(SO4)•2(H2O) P 212121 2 2 2
 

Other Lecontite Information

Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Lecontite :
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
15 - WWW-MINCRYST

Search for Lecontite using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Lecontite :

A Bijoux Google Search for Lecontite
Adam's Minerals Google Search for Lecontite
Cape Minerals Google Search for Lecontite
Dakota Matrix Minerals Google Search for Lecontite
Excalibur Mineral Corp. Google Search for Lecontite
Exceptional Minerals Google Search for Lecontite
John Betts Fine Minerals Search for Lecontite
McDougall Minerals Google Search for Lecontite
Mineral News Website Link
Rock and Mineral Shows Google Search for Lecontite
Weinrich Minerals, Inc. Google Search for Lecontite

Ask about Lecontite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

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

Lecontite

(NH4,K)Na(SO4)•2(H2O)
Dana No: 29.02.01.01 Strunz No: 07.CD.15
Locality:

 

Notes: