Mineralogy Database

Endellite Mineral Data

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General Endellite Information

Help on Chemical  Formula: Chemical Formula: Al2Si2O5(OH)4•2(H2O)
Help on Composition: Composition: Molecular Weight = 294.19 gm
   Aluminum  18.34 %  Al   34.66 % Al2O3
   Silicon   19.09 %  Si   40.85 % SiO2
   Hydrogen   2.74 %  H    24.49 % H2O
   Oxygen    59.82 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Al2Si2O5(OH)4•2(H2O)
Help on Environment: Environment: Formed by weathering or hydrothermal alteration of aluminosilicate minerals. Dehydrates to halloysite above 400 deg C.
Help on IMA Status: IMA Status: Discredited IMA 1967 (Dana # Added)
Help on Locality: Locality: North Gardiner mine, Bedford, Lawrence County, Indiana, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named in 1943 for Kurt Endell (1887{?), German geologist, one of the discoverers of the mineral.
Help on Synonym: Synonym: Hydrohalloysite

Endellite Image

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Comments: Gray to white massive endellite.
Location: Buck Reef Deposit, Ravenswood, Queensland, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Endellite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5775:1:2.3258
Help on Cell Dimensions: Cell Dimensions: a = 5.14, b = 8.9, c = 20.7, Z = 4; beta = 99.7° V = 933.40 Den(Calc)= 2.09
Help on Crystal System: Crystal System: Monoclinic - Domatic H-M Symbol (m) Space Group: Cc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.42(1), 1.481(0.9), 10.1(0.9),3.34(0.9), 1.678(0.8), 2.56(0.8), 1.283(0.7),

Physical Properties of Endellite

Help on Cleavage: Cleavage: None
Help on Color: Color: Blue, Brown, Colorless, Green, Gray.
Help on Density: Density: 2.18 - 2.3, Average = 2.24
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Earthy - Dull, clay-like fractures with no visible crystalline affinities, (e.g. howlite).
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Habit: Habit: Porcelainous - Fine-grained, translucent massive material like broken china
Help on Hardness: Hardness: 1-2 - Between Talc and Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Earthy (Dull)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Endellite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.071 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2569,KPDmeas= 0.2397,KC= 0.24
Ncalc = 1.5 - 1.55
Help on Optical Data: Optical Data: Biaxial (?), b=1.537

Calculated Properties of Endellite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.28 gm/cc
note: Specific Gravity of Endellite =2.24 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0092078686
Boson Index = 0.9907921314
Help on Photoelectric: Photoelectric: PEEndellite = 1.33 barns/electron
U=PEEndellite x rElectron Density= 3.04 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Endellite is Not Radioactive

Endellite Classification

Help on  Dana Class: Dana Class: (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.01)with 1:1 layers
  (71.01.01)Kaolinite group Dickite Al2Si2O5(OH)4 Cc m Kaolinite Al2Si2O5(OH)4 P1 1 Nacrite Al2Si2O5(OH)4 Cc m Halloysite Al2Si2O5(OH)4 Cc m Endellite? Al2Si2O5(OH)4•2(H2O) Cc m Odinite (Fe,Mg,Al,Fe,Ti,Mn)2.5(Si,Al)2O5(OH)4 Cm m
Help on  Strunz Class: Strunz Class: 09.ED.10 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.ED -Phyllosilicates with kaolinite layers
09.ED.10 Endellite! Al2Si2O5(OH)4•2(H2O) Cc m
09.ED.10 Hisingerite Fe2Si2O5(OH)4•2(H2O) Unk Mono
09.ED.10 Halloysite Al2Si2O5(OH)4 Cc m
09.ED.10 Sturtite? (Fe3)(Mn2,Ca,Mg)Si4O10(OH)3•10(H2O) None

Other Endellite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Endellite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Dana No: Strunz No: 09.ED.10





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