Mineralogy Database

Ludlamite Mineral Data

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General Ludlamite Information

Help on Chemical  Formula: Chemical Formula: (Fe++,Mg,Mn)3(PO4)2•4(H2O)
Help on Composition: Composition: Molecular Weight = 400.88 gm
   Magnesium    5.46 %  Mg    9.05 % MgO
   Manganese    4.11 %  Mn    5.31 % MnO
   Iron        25.08 %  Fe   32.26 % FeO
   Phosphorus  15.45 %  P    35.41 % P2O5
   Hydrogen     2.01 %  H    17.98 % H2O
   Oxygen      47.89 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+1.8Mg0.9Mn2+0.3(PO4)2•4(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1877
Help on Locality: Locality: Wheal Jane, Kea, near Truro, Cornwall, England, UK. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Henry Ludlam (1824-1880), English mineralogist and collector.
Help on Name Pronunciation: Name Pronunciation: Ludlamite + Pronunciation Say LUDLAMITE
Help on Synonym: Synonym: ICSD 34254
  PDF 35-634
 

Ludlamite Image

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  Ludlamite

Comments: crystal group of Ludlamite.
Location: Huanuni Mine, Oruro Department, Bolivia. Scale: Crystal size 1.5 x 1 cm.
© John Veevaert

Ludlamite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.2688:1:2.0068
Help on Cell Dimensions: Cell Dimensions: a = 10.541, b = 4.646, c = 9.324, Z = 2; beta = 100.43° V = 449.08 Den(Calc)= 2.96
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.923(1), 4.586(0.85), 3.968(0.5),
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: ( 4 1 2) ( 0 1 1) ( 1 1 1) ( 0 1 2) ( 1 1 0) ( 1 0 0) ( 0 0 1)

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Physical Properties of Ludlamite

Help on Cleavage: Cleavage: {001} Perfect, {100} Indistinct
Help on Color: Color: Apple green, Colorless, Green, Greenish white, Light green.
Help on Density: Density: 3.15
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Ludlamite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.06 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.228,KPDmeas= 0.2143,KC= 0.2151
Ncalc = 1.64 - 1.68
Help on Optical Data: Optical Data: Biaxial (+), a=1.653, b=1.675, g=1.697, bire=0.0440, 2V(Calc)=88, 2V(Meas)=82. Dispersion r > v.
 

Calculated Properties of Ludlamite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.13 gm/cc
note: Specific Gravity of Ludlamite =3.15 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PELudlamite = 9.27 barns/electron
U=PELudlamite x rElectron Density= 29.02 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ludlamite is Not Radioactive
 

Ludlamite Classification

Help on  Dana Class: Dana Class: 40.03.05.01 (40)Hydrated Phosphates, etc
  (40.03)where (A++)3 (XO4)2 � x(H2O)
  (40.03.05)Ludlamite Group
 
40.03.05.01 Ludlamite (Fe,Mg,Mn)3(PO4)2•4(H2O) P 21/a 2/m
 
40.03.05.02 Metaswitzerite Mn3(PO4)2•4(H2O) P 2/a 2/m
 
40.03.05.03 Sterlinghillite Mn3(AsO4)2•3(H2O) Mono Mono
 
40.03.05.04 Switzerite (Mn,Fe)3(PO4)2•7(H2O) P 21/a 2/m
Help on  Strunz Class: Strunz Class: 08.CD.20 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CD -With only medium-sized cations, RO4:H2O = 1:2
 
08.CD.20 Ludlamite (Fe,Mg,Mn)3(PO4)2•4(H2O) P 21/a 2/m
 

Other Ludlamite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Ludlamite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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

Ludlamite

(Fe++,Mg,Mn)3(PO4)2•4(H2O)
Dana No: 40.03.05.01 Strunz No: 08.CD.20
Locality:

 

Notes:

 

 
   
 


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