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 % Mn2 O3
Aluminum 23.02 % Al 43.50 % Al2 O3
Iron 2.55 % Fe 3.65 % Fe2 O3
Silicon 17.12 % Si 36.62 % SiO2
Hydrogen 0.31 % H 2.74 % H2 O
Oxygen 48.76 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Mg2 Al5.6 Fe3+ 0.3 Mn3+ 0.1 Si4 O18 (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 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 - Sphenoidal H-M Symbol (2) Space Group: P 21
X Ray Diffraction:
By Intensity(I/Io ): 3.5(1), 3.03(0.8), 2.61(0.6),
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:
PEYoderite = 2.46 barns/electronU=PEYoderite x r Electron 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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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:
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