Yoderite Mineral Data

Yoderite Mineral Data +

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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.

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

Diaphaniety:

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

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:

r_electron=3.35 gm/cc
note: r_Yoderite=3.38 gm/cc.

Fermion Index

Fermion Index = 0.01617
Boson Index = 0.98383

Photoelectric:

PE_Yoderite= 2.46 barns/electron
U=PE_Yoderite x r_electron= 8.24 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Yoderite is Not Radioactive

Yoderite Classification

Dana Class:

52.2.2b.3 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

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

(52.2.2b)AL2SIO5 Andalusite subgroup)

52.2.2b.1 Andalusite Al2SiO5=Al[6]Al[5]OSiO4 Pnnm 2/m 2/m 2/m

52.2.2b.2 Kanonaite (Mn,Al)AlSiO5 Pnnm 2/m 2/m 2/m

52.2.2b.3 Yoderite Mg2(Al,Fe)6Si4O18(OH)2 P 2₁ 2

Strunz Class:

VIII/B.02-60 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6]

VIII/B.02 - Disthene series

VIII/B.02-10 Sillimanite Al2SiO5=Al[6]Al[4]OSiO4 P nma 2/m 2/m 2/m

VIII/B.02-20 Andalusite Al2SiO5=Al[6]Al[5]OSiO4 Pnnm 2/m 2/m 2/m

VIII/B.02-30 Kanonaite (Mn,Al)AlSiO5 Pnnm 2/m 2/m 2/m

VIII/B.02-40 Kyanite Al2SiO5=Al[6]Al[6]OSiO4 P1 1

VIII/B.02-50 Mullite Al(42x)Si(2-2x)O(10-x)wherex=0.17to0.59 Pbam 2/m 2/m 2/m

VIII/B.02-60 Yoderite Mg2(Al,Fe)6Si4O18(OH)2 P 2₁ 2

VIII/B.02-70 Topaz Al2SiO4(F,OH)2 Pbnm 2/m 2/m 2/m

Other Yoderite Information

References:

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

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Yoderite

Mg2(Al,Fe+++)6Si4O18(OH)2
Dana No: 52.2.2b.3 Strunz No: VIII/B.02-60
Locality:

Notes: