General Portlandite Information
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Chemical Formula: |
Ca(OH)2 |
Composition: |
Molecular Weight = 74.09 gm |
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Calcium 54.09 % Ca 75.69 % CaO |
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Hydrogen 2.72 % H 24.31 % H2O |
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Oxygen 43.19 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Ca(OH)2 |
Environment: |
Larnite-spurrite contact rocks and volcanic fumaroles. |
IMA Status: |
Valid Species (Pre-IMA) 1933 |
Locality: |
Scawt Hill, Antrim County, Northern Ireland. Link to MinDat.org Location Data. |
Name Origin: |
Named because the material is a common product of hydration of portland cement. |
Synonym: |
ICSD 15471 |
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PDF 44-1481 |
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Portlandite Image |
Images:
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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 |
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Portlandite Crystallography
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Axial Ratios: |
a:c = 1:1.36541 |
Cell Dimensions: |
a = 3.585, c = 4.895, Z = 1; V = 54.48 Den(Calc)= 2.26 |
Crystal System: |
Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: P 3m1 |
X Ray Diffraction: |
By Intensity(I/Io): 2.628(1), 4.9(0.74), 1.927(0.42), |
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Crystal Structure:
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Henderson D M , Gutowsky H S , American Mineralogist , 47 (1962) p.1231-1251, A nuclear magnetic resonance determination of the hydrogen positions in Ca(OH)2, T = -190 C
View Additional jPOWD Structure files for Portlandite
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
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Physical Properties of Portlandite
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Cleavage: |
[0001] Perfect |
Color: |
Colorless. |
Density: |
2.23 |
Diaphaniety: |
Transparent |
Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
Habit: |
Hexagonal - Six-sided crystal shape in cross-section or habit. |
Habit: |
Platy - Sheet forms (e.g. micas). |
Hardness: |
2.5-3 - Finger Nail-Calcite |
Luster: |
Pearly |
Streak: |
white |
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Optical Properties of Portlandite
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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 |
Optical Data: |
Uniaxial (-), e=1.547, w=1.574, bire=0.0270. |
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Calculated Properties of Portlandite
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Electron Density: |
relectron=2.32 gm/cc note: rPortlandite =2.26 gm/cc. |
Fermion Index |
Fermion Index = 0.00094 Boson Index = 0.99906 |
Photoelectric: |
PEPortlandite = 6.54 barns/electron U=PEPortlandite x relectron= 15.16 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Portlandite is Not Radioactive |
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Portlandite Classification
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Dana Class: |
6.2.1.4 (6)Hydroxides and Oxides Containing Hydroxyl |
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(6.2)where X++ (OH)2 |
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(6.2.1)Brucite group (Rhombohedral: P3¯m1) |
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6.2.1.1 Brucite Mg(OH)2 P 3m1 3 2/m |
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6.2.1.2 Amakinite (Fe,Mg)(OH)2 P 3m1 3 2/m |
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6.2.1.3 Pyrochroite Mn(OH)2 P 3m1 3 2/m |
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6.2.1.4 Portlandite Ca(OH)2 P 3m1 3 2/m |
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6.2.1.5 Theophrastite Ni(OH)2 P 3m1 3 2/m |
Strunz Class: |
IV/F.03-100 IV - Oxides |
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IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure |
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IV/F.03 - Brucite series |
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IV/F.03-10 Brucite Mg(OH)2 P 3m1 3 2/m |
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IV/F.03-20 Amakinite (Fe,Mg)(OH)2 P 3m1 3 2/m |
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IV/F.03-30 Pyrochroite Mn(OH)2 P 3m1 3 2/m |
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IV/F.03-40 Theophrastite Ni(OH)2 P 3m1 3 2/m |
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IV/F.03-50 Paraotwayite Ni(OH)2-x(SO4,CO3)0.5xx=.5 Pm m |
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IV/F.03-60 Sweetite Zn(OH)2 P 41212,P 43212 4 2 2 |
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IV/F.03-70 Ashoverite Zn(OH)2 I 41/amd 4/m 2/m 2/m |
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IV/F.03-80 Wulfingite Zn(OH)2 P 212121 2 2 2 |
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IV/F.03-90 Spertiniite Cu(OH)2 C mc21 mm2 |
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IV/F.03-100 Portlandite Ca(OH)2 P 3m1 3 2/m |
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Other Portlandite Information
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References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Portlandite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - Crocoite.com Mineral Locations
4 - EUROmin Project
5 -Google Images
6 -Google Scholar
7 -Handbook of Mineralogy (UofA)
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 -Mineralienatlas (Deutsch)
12 -QUT Mineral Atlas
13 - WWW-MINCRYST
14 -École des Mines de Paris
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Portlandite
Ca(OH)2
Dana No: 6.2.1.4 Strunz No: IV/F.03-100
Locality:
Notes:
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