Endellite Mineral Data

Endellite Mineral Data

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General Endellite Information

Chemical Formula:

Al2Si2O5(OH)4·2(H2O)

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

Empirical Formula:

Al₂Si₂O₅(OH)₄·2(H₂O)

Environment:

Formed by weathering or hydrothermal alteration of aluminosilicate minerals. Dehydrates to halloysite above 400 deg C.

IMA Status:

Discredited IMA 1967 (Dana # Added)

Locality:

North Gardiner mine, Bedford, Lawrence County, Indiana, USA. Link to MinDat.org Location Data.

Name Origin:

Named in 1943 for Kurt Endell (1887{?), German geologist, one of the discoverers of the mineral.

Synonym:

Hydrohalloysite

Kimolite

Endellite Image

Images:

Endellite

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

Axial Ratios:

a:b:c =0.5775:1:2.3258

Cell Dimensions:

a = 5.14, b = 8.9, c = 20.7, Z = 4; beta = 99.7° V = 933.40 Den(Calc)= 2.09

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Cc

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Cleavage:

None

Color:

Blue, Brown, Colorless, Green, Gray.

Density:

2.18 - 2.3, Average = 2.24

Diaphaniety:

Transparent to Translucent

Fracture:

Earthy - Dull, clay-like fractures with no visible crystalline affinities, (e.g. howlite).

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Porcelainous - Fine-grained, translucent massive material like broken china

Hardness:

1-2 - Between Talc and Gypsum

Luminescence:

Non-fluorescent.

Luster:

Earthy (Dull)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Endellite

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

Optical Data:

Biaxial (?), b=1.537

Calculated Properties of Endellite

Electron Density:

r_electron=2.28 gm/cc
note: r_Endellite=2.24 gm/cc.

Fermion Index

Fermion Index = 0.0092
Boson Index = 0.9908

Photoelectric:

PE_Endellite= 1.33 barns/electron
U=PE_Endellite x r_electron= 3.04 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Endellite is Not Radioactive

Endellite Classification

Dana Class:

71.1.1.4a (71)Phyllosilicate Sheets of Six-Membered Rings

(71.1)with 1:1 layers

(71.1.1)Kaolinite group

71.1.1.1 Dickite Al2Si2O5(OH)4 Cc m

71.1.1.2 Kaolinite Al2Si2O5(OH)4 P1 1

71.1.1.3 Nacrite Al2Si2O5(OH)4 Cc m

71.1.1.4 Halloysite Al2Si2O5(OH)4 Cc m

71.1.1.4a Endellite ? Al2Si2O5(OH)4·2(H2O) Cc m

71.1.1.5 Odinite (Fe,Mg,Al,Fe,Ti,Mn)2.5(Si,Al)2O5(OH)4 Cm m

Strunz Class:

VIII/H.25-00 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups

VIII/H.25 - Kaolinite group

Other Endellite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Endellite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (MinSocAm) 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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Translate Endellite Mineral Data :

Ask about Endellite here :
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Print or Cut-and-Paste your Endellite Specimen Label here :

Endellite

Al2Si2O5(OH)4·2(H2O)
Dana No: 71.1.1.4a Strunz No: VIII/H.25-00
Locality:

Notes: