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Yoderite

A valid IMA mineral species
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Mg(Al,Fe3+)3(SiO4)2O(OH)
Colour:
Deep purple to dark violet, green (rare)
Lustre:
Vitreous, Greasy
Hardness:
6
Specific Gravity:
3.39
Crystal System:
Monoclinic
Name:
Named in 1959 by Duncan Mckie in honour of Hatten Schuyler Yoder, Jr. (20 March 1921, Cleveland, Ohio, USA - 2 August 2003, Bethesda, Maryland, USA), geophysicist and petrologist, 4th Director of the Geophysical Laboratory, Carnegie Institution of Washington (USA) from 1971 to 1986. He conducted pioneering work on minerals under high pressure and temperature. He was noted for his study of silicates and igneous rocks.
Type Locality:
ⓘMautia Hill, Kongwa, Kongwa District, Dodoma Region, Tanzania
A major phase inquartz-kyanite-talc schist formed under conditions of ~10 kbar H2O pressure and 800 °C.


Unique Identifiers
IMA Formula:
(MgAl3)(MgAl)Al2O2(SiO4)4(OH)2
Type description reference:
McKie D, Radford A J (1959) Yoderite, a new hydrous magnesium iron alumino-silicate from Mautia Hill, Tanganyika. Mineralogical Magazine 32, 282-307.

Classification of Yoderite
Dana 8th ed.:
52.2.2b.3

52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
2 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
Hey's CIM Ref.:
16.19.9

16 : Silicates Containing Aluminum and other Metals
19 : Aluminosilicates of Fe and Mg

Mineral SymbolsJolyon RalphUnited Kingdom

Physical Properties of Yoderite
Transparency:
Transparent
Colour:
Deep purple to dark violet, green (rare)
Hardness:
6 onMohs scale
Cleavage:
Distinct/Good
{001}
Parting:
[001] good
{100} poor
Density:
3.39 g/cm3 (Measured)    3.33 g/cm3 (Calculated)

Optical Data of Yoderite
Surface Relief:
High
Dispersion:
weak to moderate
Pleochroism:
Visible
Comments:
Blue - prussian blue, indigo, olive green
Green - Green, pale yellow, yellow
Color - alpha, beta, gamma

Chemistry of Yoderite
Common Impurities:
Ti,Mn,H2O,P

Chemical Analysis  "  "
Frank K. Mazdab collection; sample FKM-307; https://www.rockptx.com/fkm-301-to-fkm-325/#FKM-307
green yoderite as large patches intergrown within a single large splintery anthophyllite crystal, along with patchy talc. This assemblage differs from the classic kyanite+talc "whiteschist" assemblage, although it presumably experienced similar P-T conditions. EPMA analysis Fe measured as FeO, so Fe3+ calculated by charge balance. H2O calculated by stochiometry.

Crystallography of Yoderite
Place of Conservation of Type Material:
Geological Survey of Tanzania, JH 2563/2, JH 2563/14; National Museum of Natural History, Washington, D.C., USA, 137854.
Associated Minerals at Type Locality:
HematiteKyaniteQuartzTalc
Reference:
McKie D, Radford A J (1959) Yoderite, a new hydrous magnesium iron alumino-silicate from Mautia Hill, Tanganyika. Mineralogical Magazine 32, 282-307.

Other Language Names for Yoderite

Common AssociatesOrth.mmm(2/m2/m2/m)9.AF.Jingwenite-(Y)YAlV4+(SiO4)O2(OH)2Mon. 2/m9.AF.BarwooditeMn2+6Nb5+(SiO4)2O3(OH)3Trig. 3 :P39.AF.05SillimaniteAl2(SiO4)OOrth.mmm(2/m2/m2/m)9.AF.05XenoliteAl10Si8O319.AF.10KanonaiteMn3+Al(SiO4)OOrth.mmm(2/m2/m2/m) :Pnnm9.AF.10AndalusiteAl2(SiO4)OOrth.mmm(2/m2/m2/m) :Pnnm9.AF.15KyaniteAl2(SiO4)OTric.1 :P19.AF.20KrieseliteAl2(GeO4)F2Orth.mmm(2/m2/m2/m) :Pnma9.AF.20MulliteAl4+2xSi2-2xO10-xOrth.mmm(2/m2/m2/m) :Pbam9.AF.23BoromulliteAl9BSi2O19Orth.mm2 :Cmc219.AF.30ZincostauroliteZn2Al9Si4O23(OH)Mon. 2/m :B2/m9.AF.30StauroliteFe2+2Al9Si4O23(OH)Mon. 2/m :B2/m9.AF.30MagnesiostauroliteMg(Mg,Li)3(Al,Mg)18Si8O44(OH)4Mon. 2/m :B2/m9.AF.35TopazAl2(SiO4)(F,OH)2Orth.mmm(2/m2/m2/m)9.AF.40NorbergiteMg3(SiO4)F2Orth.mmm(2/m2/m2/m)9.AF.45ChondroditeMg5(SiO4)2F2Mon. 2/m :P21/b9.AF.45KumtyubeiteCa5(SiO4)2F2Mon. 2/m :P21/b9.AF.45ReinhardbraunsiteCa5(SiO4)2(OH,F)2Mon. 2/m :P21/b9.AF.45HydroxylchondroditeMg5(SiO4)2(OH)2Mon. 2/m :P21/b9.AF.45AlleghanyiteMn2+5(SiO4)2(OH)2Mon. 2/m :P21/b9.AF.50Unnamed (Ca-analogue of Humite)Ca7(SiO4)4F2Orth.mmm(2/m2/m2/m)9.AF.50HumiteMg7(SiO4)3F2Orth.mmm(2/m2/m2/m) :Pnma9.AF.50Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2Orth.mmm(2/m2/m2/m)9.AF.50Unnamed (OH-analogue of humite)Mg7(SiO4)3(OH)2Orth.9.AF.50FluorchegemiteCa7(SiO4)3F2Orth.mmm(2/m2/m2/m)9.AF.55HydroxylclinohumiteMg9(SiO4)4(OH)2Mon. 2/m :P21/b9.AF.55ClinohumiteMg9(SiO4)4F2Mon. 2/m :P21/b9.AF.55SonoliteMn2+9(SiO4)4(OH)2Mon. 2/m :P21/b9.AF.60LeucophoeniciteMn2+7(SiO4)3(OH)2Mon. 2/m :P21/b9.AF.65RibbeiteMn2+5(SiO4)2(OH)2Orth.mmm(2/m2/m2/m)9.AF.70JerrygibbsiteMn2+9(SiO4)4(OH)2Orth.mmm(2/m2/m2/m) :Pbcn9.AF.75FranciscaniteMn2+6(V5+,◻)2(SiO4)2(O,OH)6Trig. 3 :P39.AF.75ScorticoiteMn6(Sb,◻)Σ2(SiO4)2O3(OH)3Trig. 3 :P39.AF.75WeliniteMn2+6(W6+,Mg)2(SiO4)2(O,OH)6Trig. 3 :P39.AF.75ÖrebroiteMn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3Trig. 3 :P39.AF.80EllenbergeriteMg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10Hex. 6 :P639.AF.85MagnesiochloritoidMgAl2O(SiO4)(OH)2Mon. 2/m :B2/b9.AF.85OttréliteMn2+Al2O(SiO4)(OH)2Mon.9.AF.85ChloritoidFe2+Al2O(SiO4)(OH)2Mon. 2/m :B2/b9.AF.90OlmiiteCaMn2+[SiO3(OH)](OH)Orth.mmm(2/m2/m2/m) :Pbca9.AF.90PoldervaartiteCaCa[SiO3(OH)](OH)Orth.mmm(2/m2/m2/m) :Pbca9.AF.95Pilawite-(Y)Ca2Y2Al4(SiO4)4O2(OH)2Mon. 2/m :P21/b

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    • References for YoderiteⓘMautia Hill (TL)American Mineralogist 45 (1960)+2 other references
    Zimbabwe
     
    Johnson et al. (1998)
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