Yoderite Mineral Data

General Yoderite Information

Chemical Formula:

Mg2(Al,Fe+++)6Si4O18(OH)2

Composition:

Molecular Weight = 656.30 gm

Magnesium 7.41 % Mg 12.28 % MgO

Manganese 0.84 % Mn 1.20 % Mn₂O₃

Aluminum 23.02 % Al 43.50 % Al₂O₃

Iron 2.55 % Fe 3.65 % Fe₂O₃

Silicon 17.12 % Si 36.62 % SiO₂

Hydrogen 0.31 % H 2.74 % H₂O

Oxygen 48.76 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₂Al_5.6Fe³⁺_0.3Mn³⁺_0.1Si₄O₁₈(OH)₂

Environment:

A major phase in quartz-kyanite-talc schist formed under conditions of ~10 kbar H2O pressure and 800 deg C.

IMA Status:

Approved IMA 1959

Locality:

On Mautia Hill, Kongwa, Central Province, Tanzania. Link to MinDat.org Location Data.

Name Origin:

Named for Hatten Schyuler Yoder, Jr. (1921-), petrologist with the Geophysical Laboratory, Washinton, D. C. USA.

Name Pronunciation:

Yoderite

Synonym:

ICSD 40123

PDF 12-625

Yoderite Image

Images:

Yoderite

Comments: Dark bluish-black prismatic yoderite in quartz.
Location: Mautia Hill, Dodoma, Tanzania. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Yoderite Crystallography

Axial Ratios:

a:b:c =1.3812:1:1.2478

Cell Dimensions:

a = 7.9933, b = 5.787, c = 7.2213, Z = 1; beta = 104.974° V = 322.69 Den(Calc)= 3.38

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 2₁

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

By Intensity(I/I_o): 3.5(1), 3.03(0.8), 2.61(0.6),

Crystal Structure:

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Higgins J B , Ribbe P H , Nakajima Y , American Mineralogist , 67 (1982) p.76-84, An ordering model for the commensurate antiphase structure of yoderite, Ordered, T = 20 deg C, Note: the sample is from Mautia Hill, Tanzania

View Additional jPOWD Structure files for Yoderite
[1] [2]

Physical Properties of Yoderite

Cleavage:

{001} Parting, {100} Parting

Color:

Purple red, Deep blue, Emerald green, Yellow.

Density:

3.39

Diaphaneity:

Transparent

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Yoderite

Gladstone-Dale:

CI meas= 0.043 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2067,KPDmeas= 0.206,KC= 0.2152
Ncalc = 1.73

Optical Data:

Biaxial (+), a=1.689-1.691, b=1.691-1.693, g=1.712-1.715, bire=0.0230-0.0240, 2V(Calc)=34-36, 2V(Meas)=25-30.

Pleochroism (x):

deep prussian blue or green.

Pleochroism (y):

indigo or light yellow.

Pleochroism (z):

pale olive green or yellow.

Calculated Properties of Yoderite

Electron Density:

Bulk Density (Electron Density)=3.35 gm/cc
note: Specific Gravity of Yoderite =3.38 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Yoderite= 2.46 barns/electron
U=PE_Yoderite x rElectron Density= 8.24 barns/cc.

Radioactivity:

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

Yoderite Classification

Dana Class:

52.02.02b.03 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.02)with cations in [4] and >[4] coordination

(52.02.02b)AL2SIO5 Andalusite subgroup)

52.02.02b.01 Andalusite Al2SiO5=Al[6]Al[5]OSiO4 Pnnm 2/m 2/m 2/m

52.02.02b.02 Kanonaite (Mn,Al)AlSiO5 Pnnm 2/m 2/m 2/m

52.02.02b.03 Yoderite Mg2(Al,Fe)6Si4O18(OH)2 P 2₁ 2

Strunz Class:

09.AF.25 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AF -Nesosilicates with additional anions;

09.AF.25 Yoderite Mg2(Al,Fe)6Si4O18(OH)2 P 2₁ 2

Other Yoderite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)

See Also:

Links to other databases for Yoderite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Yoderite here :
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Mindat.org's Discussion Groups
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Print or Cut-and-Paste your Yoderite Specimen Label here :

Yoderite

Mg2(Al,Fe+++)6Si4O18(OH)2
Dana No: 52.02.02b.03 Strunz No: 09.AF.25
Locality:

Notes: