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Yoderite

Big Photo

Mautia Hill, Kongwa, Dodoma Region, Tanzania
© Maurice de Graaf

Show Yoderite Photos (4)
Formula:
Mg(Al,Fe
3+
 
)
 
3
[O|OH|(SiO
 
4
)
 
2
]
System:MonoclinicColour:Deep purple to dark ...
Hardness:6
Name:Named after Hatten Schuyler Yoder, Jr. (1921-2003), petrologist, Director of the Geophysical Laboratory, Carnegie Institution of Washington (USA)
This page provides mineralogical data about Yoderite.

Classification of Yoderite

IMA status:Approved
Strunz 8th edition ID:8/B.02-60
Nickel-Strunz 10th (pending) edition ID:9.AF.25

9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
Dana 8th edition ID: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
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Type Occurrence of Yoderite

Type Locality:Mautia Hill, Kongwa, Dodoma Region, Tanzania
Year of Discovery:1959

Occurrences of Yoderite

Geological Setting:Major phase in kyanite-quartz-talc schist ~10kb water pressure, 800 degrees C

Physical Properties of Yoderite

Lustre:Vitreous, Greasy
Diaphaneity (Transparency):Transparent
Colour:Deep purple to dark violet, green (rare)
Hardness (Mohs):6
Cleavage:Distinct/Good
{001}
Parting:[001] good
{100} poor
Density (measured):3.39 g/cm3
Density (calculated):3.33 g/cm3

Crystallography of Yoderite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m {P1 1 21/m} {P21/m} {P1 21/m 1}
Cell Parameters:a = 8.02Å, b = 5.81Å, c = 7.25Å
β = 104.91°
Ratio:a:b:c = 1.38 : 1 : 1.248
Unit Cell Volume:V 326.45 ų (Calculated from Unit Cell)
Z:1
Morphology:Anhedral grains, bladed or lathlike crystals to 12mm

Optical Data of Yoderite

Type:Biaxial (+)
RI values: nα = 1.689 - 1.691 nβ = 1.691 - 1.693 nγ = 1.712 - 1.715
2V:Measured: 25° to 30°, Calculated: 34° to 36°
Maximum Birefringence:δ = 0.023 - 0.024

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
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

Chemical Properties of Yoderite

Formula:
Mg(Al,Fe
3+
 
)
 
3
[O|OH|(SiO
 
4
)
 
2
]
Essential elements:Al, H, Mg, O, Si
All elements listed in formula:Al, Fe, H, Mg, O, Si
Common Impurities:Ti,Mn,H2O,P

Relationship of Yoderite to other Species

Common Associates:
KyaniteTalcQuartzHematite
Related Minerals - Nickel-Strunz Grouping):

- +
9.AF.05Sillimanite
Al
 
2
[O|SiO
 
4
]
9.AF.10Andalusite
Al
 
2
[O|SiO
 
4
]
9.AF.10Kanonaite
Mn
3+
 
Al[O|SiO
 
4
]
9.AF.15Kyanite
Al
 
2
[O|SiO
 
4
]
9.AF.20Mullite
Al
 
8
[(O,OH,F)|(Si,Al)O
 
4
]
 
4
9.AF.20Krieselite
(Al,Ga)
 
2
[(OH)
 
2
|GeO
 
4
]
9.AF.23Boromullite
Al
 
9
Si
 
2
BO
 
19
9.AF.30Magnesiostaurolite
(Mg,Li,Fe
2+
 
)
 
1.5-2
Al
 
9
[O
 
6
|(OH)
 
2
|(SiO
 
4
)
 
4
]
9.AF.30Staurolite
(Fe
2+
 
,Mg,Zn)
 
1.5-2
Al
 
9
[O
 
6
|(OH,O)
 
2
|(SiO
 
4
)
 
4
]
9.AF.30Zincostaurolite
(Zn,Li,Fe
2+
 
,Mg)
 
<2
Al
 
9
[O
 
6
|(OH)
 
2
|(SiO
 
4
)
 
4
]
9.AF.35Topaz
Al
 
2
[(F,OH)
 
2
|SiO
 
4
]
9.AF.40Norbergite
Mg
 
3
[(F,OH)
 
2
|SiO
 
4
]
9.AF.45Alleghanyite
Mn
2+
5
[(OH)
 
2
|(SiO
 
4
)
 
2
]
9.AF.45Chondrodite
(Mg,Fe
2+
 
)
 
5
[(F,OH)
 
2
|(SiO
 
4
)
 
2
]
9.AF.45Reinhardbraunsite
Ca
 
5
[(OH,F)
 
2
|(SiO
 
4
)
 
2
]
9.AF.45Kumtyubeite
Ca
 
5
(SiO
 
4
)
 
2
F
 
2
9.AF.50Humite
(Mg,Fe
2+
 
)
 
7
[(F,OH)
 
2
|(SiO
 
4
)
 
3
]
9.AF.50Manganhumite
(Mn
2+
 
,Mg)
 
7
[(OH)
 
2
|(SiO
 
4
)
 
3
]
9.AF.50Unnamed (Ca-analogue of humite)
Ca
 
7
(SiO
 
4
)
 
3
(OH)
 
2
9.AF.55Clinohumite
(Mg,Fe
2+
 
)
 
9
[(F,OH)
 
2
|(SiO
 
4
)
 
4
]
9.AF.55Sonolite
Mn
2+
9
[(OH,F)
 
2
|(SiO
 
4
)
 
4
]
9.AF.55Hydroxylclinohumite
Mg
 
9
[(OH,F)
 
2
|(SiO
 
4
)
 
4
]
9.AF.60Leucophoenicite
Mn
2+
7
[(OH)
 
2
|(SiO
 
4
)
 
3
]
9.AF.65Ribbeite
(Mn
2+
 
,Mg)
 
5
[(OH)
 
2
|(SiO
 
4
)
 
2
]
9.AF.70Jerrygibbsite
Mn
2+
9
[(OH)
 
2
|(SiO
 
4
)
 
4
]
9.AF.75Franciscanite
Mn
2+
6
(V
5+
 
,[])
 
2
[(O,OH)
 
3
|SiO
 
4
]
 
2
9.AF.75Örebroite
Mn
2+
3
(Fe
3+
 
,Sb
5+
 
)[(O,OH)
 
3
|SiO
 
4
]
9.AF.75Welinite
Mn
2+
6
(W
6+
 
,Mg)
 
2
[(O,OH)
 
3
|SiO
 
4
]
 
2
9.AF.80Ellenbergerite
Mg
 
6
Al
 
6
Ti[(OH)
 
6
|(HSiO
 
4
)
 
4
|(SiO
 
4
)
 
4
]
9.AF.85Chloritoid
(Fe
2+
 
,Mg,Mn
2+
 
)Al
 
2
[O|(OH)
 
2
|SiO
 
4
]
9.AF.85Magnesiochloritoid
MgAl
 
2
[O|(OH)
 
2
|SiO
 
4
]
9.AF.85Ottrélite
(Mn
2+
 
,Fe
2+
 
,Mg)Al
 
2
[O|(OH)
 
2
|SiO
 
4
]
9.AF.90Poldervaartite
CaCa[SiO
 
3
OH](OH)
9.AF.90Olmiite
CaMn
2+
 
[SiO
 
3
(OH)](OH)
Related Minerals - Hey's Index Grouping:

- +
16.19.1Indialite
Mg
 
2
Al
 
4
Si
 
5
O
 
18
16.19.2Cordierite
(Mg,Fe)
 
2
Al
 
4
Si
 
5
O
 
18
16.19.3Sekaninaite
(Fe,Mg)
 
2
Al
 
4
Si
 
5
O
 
18
16.19.4Ferrogedrite
☐[Fe
2+
2
][Fe
2+
3
Al
 
2
][(OH)
 
2
|Al
 
2
Si
 
6
O
 
22
]
16.19.5Staurolite
(Fe
2+
 
,Mg,Zn)
 
1.5-2
Al
 
9
[O
 
6
|(OH,O)
 
2
|(SiO
 
4
)
 
4
]
16.19.6Chloritoid
(Fe
2+
 
,Mg,Mn
2+
 
)Al
 
2
[O|(OH)
 
2
|SiO
 
4
]
16.19.7Amesite
Mg
 
2
Al[(OH)
 
4
|AlSiO
 
5
]
16.19.8Corundophilite
(Mg,Fe,Al)
 
6
(Si,Al)
 
4
O
 
10
(OH)
 
8
16.19.10Delessite
(Mg,Fe,Fe,Al)(Si,Al)
 
4
O
 
10
(O,OH)
 
8
16.19.11Ferrocarpholite
(Fe
2+
 
,Mg)Al
 
2
[(OH)
 
4
|Si
 
2
O
 
6
]
16.19.12Magnesiocarpholite
(Mg,Fe
2+
 
)Al
 
2
[(OH)
 
4
|Si
 
2
O
 
6
]
16.19.13Chamosite
(Fe
2+
 
,Mg)
 
5
Al[(OH)
 
8
|AlSi
 
3
O
 
10
]
16.19.14Orthochamosite
(Fe,Mg,Fe)
 
5
Al(Si
 
3
Al)O
 
10
(OH,O)
 
8
16.19.15Berthierine
(Fe,Fe,Mg)
 
2-3
(Si,Al)
 
2
O
 
5
(OH)
 
4
16.19.16Odinite
(Fe,Mg,Al,Fe,Ti,Mn)
 
2.4
(Si,Al)
 
2
O
 
5
(OH)
 
4
16.19.17Clinochlore
(Mg,Fe
2+
 
)
 
5
Al[(OH)
 
8
|AlSi
 
3
O
 
10
]
16.19.18Gedrite
☐[Mg
 
2
][Mg
 
3
Al
 
2
][(OH)
 
2
|Al
 
2
Si
 
6
O
 
22
]
16.19.19Magnesiogedrite
16.19.20Diabantite
(Mg,Fe,Al)
 
6
(Si,Al)
 
4
O
 
10
(OH)
 
8
16.19.21Sudoite
(Mg,Fe
2+
 
)
 
2
Al
 
3
[(OH)
 
8
|AlSi
 
3
O
 
10
]
16.19.22Vermiculite
(Mg,Fe,Al)
 
3
(Al,Si)
 
4
O
 
10
(OH)
 
2
·4H
 
2
O
16.19.23Corrensite
(Mg,Fe)
 
9
(Si,Al)
 
8
O
 
20
(OH)
 
10
·nH
 
2
O

Other Names for Yoderite

Other Languages:
German:Yoderit
Russian:Иодерит
Spanish:Yoderita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Yoderite

Reference List:Mineralogical Magazine (1959): 32: 282.

American Mineralogist (1960): 45: 753.

Higgins, J.B., Ribbe, P.H., and Nakajima, Y. (1982) An ordering model for the commensurate antiphase structure of yoderite. American Mineralogist: 67: 76-84.

American Mineralogist (1991): 76: 1052-1060.

Internet Links for Yoderite

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    Localities for Yoderite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Tanzania
     
    • Dodoma Region
      • Kongwa
    		American Mineralogist 45, pp. 753 (1960); American Mineralogist 76, pp. 1052-1060 (1991); Mineralogical Magazine 1963 33 : 635-645
    Zimbabwe
     
    • Zambezi Belt
    		Journal of Metamorphic Geology Volume 16 Issue 6, Pages 809 - 818
    Mineral and/or Locality
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