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Portlandite Mineral Data

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General Portlandite Information

Help on Chemical  Formula: Chemical Formula: Ca(OH)2
Help on Composition: Composition: Molecular Weight = 74.09 gm
   Calcium   54.09 %  Ca   75.69 % CaO
   Hydrogen   2.72 %  H    24.31 % H2O
   Oxygen    43.19 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca(OH)2
Help on Environment: Environment: Larnite-spurrite contact rocks and volcanic fumaroles.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1933
Help on Locality: Locality: Scawt Hill, Antrim County, Northern Ireland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named because the material is a common product of hydration of portland cement.
Help on Name Pronunciation: Name Pronunciation: Portlandite + Pronunciation Say PORTLANDITE
Help on Synonym: Synonym: ICSD 15471
  PDF 44-1481
 

Portlandite Image

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  Portlandite

Comments: Cleaved mass of white portlandite.
Location: Wessels Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 4 x 1.5 cm.
© John Veevaert

Portlandite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.36541
Help on Cell Dimensions: Cell Dimensions: a = 3.585, c = 4.895, Z = 1; V = 54.48 Den(Calc)= 2.26
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3m1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.628(1), 4.9(0.74), 1.927(0.42),
Help on Forms: Forms:

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Drag1 - Manipulate Crystal
Drag2 - Resize

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I - Indicies
<space> - Start-Stop Rotation
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Help on Above

Forms: ( 1 0 0) ( 0 0 1)

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Physical Properties of Portlandite

Help on Cleavage: Cleavage: {0001} Perfect
Help on Color: Color: Colorless.
Help on Density: Density: 2.23
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Hexagonal - Six-sided crystal shape in cross-section or habit.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luster: Luster: Pearly
Help on Streak: Streak: white
 

Optical Properties of Portlandite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.248,KPDmeas= 0.2513,KC= 0.2416
Ncalc = 1.54 - 1.55
Help on Optical Data: Optical Data: Uniaxial (-), e=1.547, w=1.574, bire=0.0270.
 

Calculated Properties of Portlandite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.32 gm/cc
note: Specific Gravity of Portlandite =2.26 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0009416194
Boson Index = 0.9990583806
Help on Photoelectric: Photoelectric: PEPortlandite = 6.54 barns/electron
U=PEPortlandite x rElectron Density= 15.16 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Portlandite is Not Radioactive
 

Portlandite Classification

Help on  Dana Class: Dana Class: 06.02.01.04 (06)Hydroxides and Oxides Containing Hydroxyl
  (06.02)where X++ (OH)2
  (06.02.01)Brucite group (Rhombohedral: P-3m1)
 
06.02.01.01 Brucite Mg(OH)2 P 3m1 3 2/m
 
06.02.01.02 Amakinite (Fe,Mg)(OH)2 P 3m1 3 2/m
 
06.02.01.03 Pyrochroite Mn(OH)2 P 3m1 3 2/m
 
06.02.01.04 Portlandite Ca(OH)2 P 3m1 3 2/m
 
06.02.01.05 Theophrastite Ni(OH)2 P 3m1 3 2/m
Help on  Strunz Class: Strunz Class: 04.FE.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FE -Hydroxides with OH, without H2O; sheets of edge-sharing octahedra
 
04.FE.05 Amakinite (Fe,Mg)(OH)2 P 3m1 3 2/m
 
04.FE.05 Brucite Mg(OH)2 P 3m1 3 2/m
 
04.FE.05 Portlandite Ca(OH)2 P 3m1 3 2/m
 
04.FE.05 Pyrochroite Mn(OH)2 P 3m1 3 2/m
 
04.FE.05 Theophrastite Ni(OH)2 P 3m1 3 2/m
 
04.FE.05 Fougerite! (Fe,Mg)6Fe2(OH)18•4(H2O) R 3m 3 2/m
 

Other Portlandite Information

Help on References: References: NAME( Dana8) 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 Portlandite :
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

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

Portlandite

Ca(OH)2
Dana No: 06.02.01.04 Strunz No: 04.FE.05
Locality:

 

Notes:

 

 
   
 


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