Lorandite Mineral Data + Say LORANDITE

AA Mineral Sepcimens
[What's New] [Mineral Galleries] [Sale Items] [About Us] [Contacts]
At AA Mineral Specimens, we source quality Mineral Specimens, Fossils, Gemstones,
Decorative Stones, Lapidary Material and Specimen Sets world-wide

General Lorandite Information
Help on Chemical Formula: Chemical Formula: TlAsS2
Help on Composition: Composition: Molecular Weight = 343.44 gm
   Thallium  59.51 %  Tl
   Arsenic   21.82 %  As
   Sulfur    18.67 %  S
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: TlAsS2
Help on Environment: Environment: Low-temperature hydrothermal mineral.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1894
Help on Locality: Locality: Allchar, near Rozdan, northwest of Salonika, Macedonia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Eotovos Laorand (1848-1919), physicist of Budapest, Hungary.
Help on Synonym: Synonym: ICSD 81094
  PDF 19-1331
 

Lorandite Image

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

Lorandite   Fangite

Comments: Brown crystals of fangite with red lorandite.
Location: Allchar, Roszdan, FYR Macedonia. Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag
Click Here for Larger Lorandite Image in a New Browser Window Images:
Click Here for Larger Lorandite Image

Lorandite

Comments: Gemmy, transparent reddish brown crystals of lorandite on matrix.
Location: Allchar, near Majdan, Macedonia. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Lorandite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.0837:1:0.5414
Help on Cell Dimensions: Cell Dimensions: a = 12.29, b = 11.34, c = 6.14, Z = 8; beta = 104.6° V = 828.09 Den(Calc)= 5.51
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.58(1), 3.59(0.6), 2.882(0.55),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

Forms: [ 3 2 1] [ 0 1 1] [ 2 0 1] [ 2 0 1] [ 2 1 0] [ 1 1 0] [ 0 0 1]

Warning: this large pop-up is very compute intensive and may not work well with some computers.
Click Here for Large Lorandite 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


Zemann A , Zemann J , Acta Crystallographica , 12 (1959) p.1002-1006, Zur kenntnis der kristallstruktur von lorandit, TlAsS2

 

Physical Properties of Lorandite

Help on Cleavage: Cleavage: [100] Perfect, [001] Distinct
Help on Color: Color: Red, Carmine red, Blackish lead gray.
Help on Density: Density: 5.5288 - 5.5362, Average = 5.53
Help on Diaphaniety: Diaphaniety: Subtransparent
Help on Fracture: Fracture: Flexible - Flexible 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: 2-2.5 - Gypsum-Finger Nail
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Sub Metallic
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: red
 

Optical Properties of Lorandite

Help on Optical Data: Optical Data: Biaxial (+), a=2.72, 2V(Meas)=70-90. Dispersion r >> v strong.
Help on Pleochroism (y): Pleochroism (y): purple-red.
Help on Pleochroism (z): Pleochroism (z): orange-red.
Help on RL Anisotrophism: RL Anisotrophism: Strong.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Lorandite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   28.80   30.60 
   
 420 nm   28.70   30.70 
 440 nm   28.60   30.80 
 460 nm   28.40   30.90 
 480 nm   28.20   31.20 
 500 nm   27.80   31.10 
 520 nm   27.50   30.60 
 540 nm   27.00   29.80 
 560 nm   26.40   28.80 
 580 nm   25.80   27.70 
 600 nm   25.00   26.70 
 620 nm   24.40   26.00 
 640 nm   23.90   25.50 
 660 nm   23.50   25.00 
 680 nm   23.20   24.70 
 700 nm   22.90   24.50 
Calculated Relative Intensity Colors of Lorandite in Air
Relative
Intensity		    0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 360%
R1                      
R2                      
 

Calculated Properties of Lorandite

Help on Electron Density: Electron Density:

relectron=4.68 gm/cc
note: rLorandite =5.51 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.0014
Boson Index = 0.9986
Help on Photoelectric: Photoelectric:

PELorandite =1,047.21 barns/electron
U=PELorandite x relectron=4,905.95 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lorandite is Not Radioactive
 

Lorandite Classification
Help on Dana Class: Dana Class: 3.7.6.1 (3)Sulfides - Sulfosalts
  (3.7)where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (3.7.6)Dana Group
 
3.7.6.1 Lorandite TlAsS2 P 21/a 2/m
Help on Strunz Class: Strunz Class: II/E.13-50 II - Sulfides and sulphosalts
  II/E - Sulfosalts (S : As,Sb,Bi = x) Sulfosalts with predominant Thallium and Mercury, x = 4.0 - 1.6
  II/E.13 - Livingstonite - Vaughanite series
 
II/E.13-10 Livingstonite HgSb4S8 A2/a 2/m
 
II/E.13-20 Grumiplucite! HgBi2S4 C 2/m 2/m
 
II/E.13-30 Simonite TlHgAs3S6 P 21/n 2/m
 
II/E.13-40 Vrbaite Tl4Hg3Sb2As8S20 C mca 2/m 2/m 2/m
 
II/E.13-42 Edenharterite TlPbAs3S6 F dd2 mm2
 
II/E.13-43 Jentschite! TlPbAs2SbS6 P 21/n 2/m
 
II/E.13-45 Hutchinsonite (Pb,Tl)2As5S9 P bca 2/m 2/m 2/m
 
II/E.13-50 Lorandite TlAsS2 P 21/a 2/m
 
II/E.13-60 Weissbergite TlSbS2 P1 1
 
II/E.13-70 Tvalchrelidzeite Hg12(Sb,As)8S15 P1 1
 
II/E.13-80 Vaughanite TlHgSb4S7 P1 ? 1
 

Other Lorandite Information
Help on References: References: NAME( AmMin) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Lorandite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 - Philatelic Mineralogy 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

Search for Lorandite using:

Google
 
Web webmineral.com
[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Lorandite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Lorandite Mineral Data :

Ask about Lorandite 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 Español

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

Lorandite

TlAsS2
Dana No: 3.7.6.1 Strunz No: II/E.13-50
Locality:

 

Notes:

 
 
   
 
Go To Webmineral Home Crystallography X-Ray D-Spacing Table Chemical Composition
Dana Classification Strunz Classification Table of Mineral Properties Alphabetical Listing of Minerals
Search Webmineral Photo Gallery of Mineral Images Help Files Links