Ettringite Mineral Data (original) (raw)

General Ettringite Information

Help on Chemical Formula: Chemical Formula:

Ca6Al2(SO4)3(OH)12•26(H2O)

Help on Composition: Composition:

Molecular Weight = 1,255.11 gm

Calcium 19.16 % Ca 26.81 % CaO

Aluminum 4.30 % Al 8.12 % Al2O3

Hydrogen 5.14 % H 45.93 % H2O

Sulfur 7.66 % S 19.14 % SO3

Oxygen 63.74 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

Ca6Al2(SO4)3(OH)12•26(H2O)

Help on IMA Status: IMA Status:

Valid Species (Pre-IMA) 1874

Help on Locality: Locality:

Ettringer Bellerberg, Ettringen, Mayen, Eifel, Rheinland-Pfalz, Germany Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for the locality

Help on Name Pronunciation: Name Pronunciation:

Ettringite + Pronunciation Say ETTRINGITE

Help on Synonym: Synonym:

ICSD 16045

PDF 41-1451

Ettringite Image

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

Click Here for Larger Ettringite Image Ettringite Comments: Small glassy whitish micro crystals of ettringite on a white powdery matrix. Location: Ettringen, Eifel, Allemagne, Germany.Scale: 2.5 x 1 x 2 cm. © John Veevaert

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

Click Here for Larger Ettringite Image Ettringite Comments: Doubly-terminated crystals of glassy yellow ettringite on matrix. Location: N'Chwaning Mine, near Kuruman, South Africa.Scale: Crystal size 4 cm. © Rob Lavinsky

Ettringite Crystallography

Help on Axial Ratios: Axial Ratios:

a:c = 1:0.95458

Help on Cell Dimensions: Cell Dimensions:

a = 22.46, c = 21.44, Z = 8; V = 9,366.45 Den(Calc)= 1.78

Help on Crystal System: Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 63/mmc

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 9.65(1), 5.58(0.8), 3.21(0.6),

Click Here for Large Ettringite 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

| | Moore A E , Taylor H F W , Acta Crystallographica, Section B , 26 (1970) p.386-393, Crystal structure of ettringite, Locality: Scawt Hill, Northern Ireland | | -------------------------------------------------------------------------------------------------------------------------------------------------------------- |

Physical Properties of Ettringite

Help on Cleavage: Cleavage:

{1010} Perfect

Help on Color: Color:

Colorless, White.

Help on Density: Density:

1.8

Help on Diaphaneity: Diaphaneity:

Transparent

Help on Habit: Habit:

Acicular - Occurs as needle-like crystals.

Help on Hardness: Hardness:

2-2.5 - Gypsum-Finger Nail

Help on Luminescence: Luminescence:

Non-fluorescent.

Help on Luster: Luster:

Vitreous (Glassy)

Help on Magnetism: Magnetism:

Nonmagnetic

Help on Streak: Streak:

white

Optical Properties of Ettringite

Help on Gladstone-Dale: Gladstone-Dale:

CI meas= -0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2699,KPDmeas= 0.2669,KC= 0.2632
Ncalc = 1.47

Help on Optical Data: Optical Data:

Uniaxial (-), e=1.47, w=1.491, bire=0.0210.

Calculated Properties of Ettringite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=1.89 gm/cc
note: Specific Gravity of Ettringite =1.80 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.0011471359
Boson Index = 0.9988528641

Help on Photoelectric: Photoelectric:

PEEttringite = 2.97 barns/electron
U=PEEttringite x rElectron Density= 5.60 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ettringite is Not Radioactive

Ettringite Classification

Help on Dana Class: Dana Class:

31.10.02.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.10)miscellaneous

(31.10.02)Dana Group

31.10.02.01 Ettringite Ca6Al2(SO4)3(OH)12•26(H2O) P 63/mmc 6/m 2/m 2/m

31.10.02.02 Bentorite Ca6(Cr,Al)2(SO4)3(OH)12•26(H2O) P 63/mmc 6/m 2/m 2/m

31.10.02.03 Buryatite! Ca3(Si,Fe,Al)[SO4][B(OH)4](OH,O)6•12(H2O) P 31c 3m

Help on Strunz Class: Strunz Class:

07.DG.15 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DG -With large and medium sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3

07.DG.15 Bentorite Ca6(Cr,Al)2(SO4)3(OH)12•26(H2O) P 63/mmc 6/m 2/m 2/m

07.DG.15 Charlesite Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O) P 31c 3m

07.DG.15 Ettringite Ca6Al2(SO4)3(OH)12•26(H2O) P 63/mmc 6/m 2/m 2/m

07.DG.15 Jouravskite Ca3Mn(SO4,CO3)2(OH)6•12(H2O) P 63/m 6/m

07.DG.15 Sturmanite Ca6(Fe,Al,Mn)2(SO4)2[B(OH)4](OH)12•25(H2O) P 31c 3m

07.DG.15 Thaumasite Ca3Si(CO3)(SO4)(OH)6•12(H2O) P 63/m 6/m

07.DG.15 Buryatite! Ca3(Si,Fe,Al)[SO4][B(OH)4](OH,O)6•12(H2O) P 31c 3m

07.DG.15 Carraraite! Ca3Ge(OH)6(SO4)(CO3)•12H2O P 63/m, or P 63 Hex

Other Ettringite Information

Help on References: References:

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 Ettringite :
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
17 - theimage

Search for Ettringite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Ettringite :

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

Ask about Ettringite 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 Espa�ol

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

Ettringite

Ca6Al2(SO4)3(OH)12•26(H2O)
Dana No: 31.10.02.01 Strunz No: 07.DG.15
Locality:

Notes: