Ettringite Mineral Data + Say ETTRINGITE


[Register] [Auction Rules] [Current Listing] [About Us] [Site Map]
e-Rocks.com, auction and sales venue for all rock and mineral enthusiasts
Our mission is to provide an online centre for Buyers and Sellers with reliable service and support
Brought to you by Thames Valley Minerals

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 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),
 

Physical Properties of Ettringite

Help on Cleavage: Cleavage: [1010] Perfect
Help on Color: Color: Colorless, White.
Help on Density: Density: 1.8
Help on Diaphaniety: Diaphaniety: 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
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:

relectron=1.89 gm/cc
note: rEttringite =1.80 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00114
Boson Index = 0.99886
Help on Photoelectric: Photoelectric:

PEEttringite = 2.97 barns/electron
U=PEEttringite x relectron= 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: 31.10.2.1 (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.10)miscellaneous
  (31.10.2)Dana Group
 
31.10.2.1 Ettringite Ca6Al2(SO4)3(OH)12·26(H2O) P 63/mmc 6/m 2/m 2/m
 
31.10.2.2 Bentorite Ca6(Cr,Al)2(SO4)3(OH)12·26(H2O) P 63/mmc 6/m 2/m 2/m
 
31.10.2.3 Buryatite! Ca3(Si,Fe,Al)[SO4][B(OH)4](OH,O)6·12(H2O) P 31c 3m
Help on  Strunz Class: Strunz Class: VI/D.13-10 VI - Sulfates,Chromates,Molybdates and Tungstates
  VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium and very big size
  VI/D.13 - Ettringite group, Ettringite - Sturmanite
 
VI/D.13-10 Ettringite Ca6Al2(SO4)3(OH)12·26(H2O) P 63/mmc 6/m 2/m 2/m
 
VI/D.13-20 Bentorite Ca6(Cr,Al)2(SO4)3(OH)12·26(H2O) P 63/mmc 6/m 2/m 2/m
 
VI/D.13-30 Jouravskite Ca3Mn(SO4,CO3)2(OH)6·12(H2O) P 63/m 6/m
 
VI/D.13-35 Carraraite! Ca3Ge(OH)6(SO4)(CO3)·12H2O P 63/m, or P 63 Hex
 
VI/D.13-40 Charlesite Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12·26(H2O) P 31c 3m
 
VI/D.13-50 Sturmanite Ca6(Fe,Al,Mn)2(SO4)2[B(OH)4](OH)12·25(H2O) P 31c 3m
 
VI/D.13-60 Buryatite! Ca3(Si,Fe,Al)[SO4][B(OH)4](OH,O)6·12(H2O) P 31c 3m
 

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 -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 -theimage 15 -École des Mines de Paris

Search for Ettringite 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 Ettringite :
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 Ettringite Mineral Data :

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 Español

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

Ettringite

Ca6Al2(SO4)3(OH)12·26(H2O)
Dana No: 31.10.2.1 Strunz No: VI/D.13-10
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