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Yagiite

Formula:
(Na,K)
 
3
Mg
 
4
(Al,Mg)
 
6
(Si,Al)
 
24
O
 
60
System:HexagonalColour:Colourless
Hardness:5 - 6
Name:Named after Kenzo Yagi (b. 1949), Professor of Geology, Hokkaido University (Japan).


Osumilite Group.

Classification of Yagiite

IMA status:Approved 1968
Strunz 8th edition ID:8/E.22-70
Nickel-Strunz 10th (pending) edition ID:9.CM.05

9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
Dana 8th edition ID:63.2.1a.10

63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
Hey's CIM Ref.:16.8.5

16 : Silicates Containing Aluminum and other Metals
8 : Aluminosilicates of Mg and alkalis
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Type Occurrence of Yagiite

Type Locality:Colomera meteorite, Granada, Andalusia, Spain
Year of Discovery:1969

Physical Properties of Yagiite

Diaphaneity (Transparency):Transparent, Translucent
Colour:Colourless
Hardness (Mohs):5 - 6

Crystallography of Yagiite

Crystal System:Hexagonal
Cell Parameters:a = 10.09Å, c = 14.29Å
Ratio:a:c = 1 : 1.416
Unit Cell Volume:V 1,259.93 ų (Calculated from Unit Cell)

Optical Data of Yagiite

Type:Uniaxial (+)
RI values: nω = 1.536 nε = 1.544
Maximum Birefringence:δ = 0.008

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

Chemical Properties of Yagiite

Formula:
(Na,K)
 
3
Mg
 
4
(Al,Mg)
 
6
(Si,Al)
 
24
O
 
60
Essential elements:Al, Mg, Na, O, Si
All elements listed in formula:Al, K, Mg, Na, O, Si
Common Impurities:Ti,Cr,Fe,Mn,Ca

Relationship of Yagiite to other Species

Member of Group:
Osumilite Group:
Related Minerals - Nickel-Strunz Grouping):

- +
9.CM.05Armenite
BaCa
 
2
Al
 
6
Si
 
9
O
 
30
·2H
 
2
O
9.CM.05Brannockite
(K,Na)Li
 
3
Sn
 
2
Si
 
12
O
 
30
9.CM.05Chayesite
K(Mg,Fe)
 
4
FeSi
 
12
O
 
30
9.CM.05Darapiosite
KNa
 
2
Li(Mn,Zn)
 
2
ZrSi
 
12
O
 
30
9.CM.05Eifelite
KNa
 
3
Mg
 
4
Si
 
12
O
 
30
9.CM.05Merrihueite
(K,Na)
 
2
(Fe,Mg)
 
5
Si
 
12
O
 
30
9.CM.05Milarite
K
 
2
Ca
 
4
Al
 
2
Be
 
4
Si
 
24
O
 
60
·H
 
2
O
9.CM.05Osumilite-(Mg)
(K,Na)(Mg,Fe)
 
2
(Al,Fe)
 
3
(Si,Al)
 
12
O
 
30
·H
 
2
O
9.CM.05Osumilite
(K,Na)(Fe
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
3
(Si,Al)
 
12
O
 
30
9.CM.05Poudretteite
KNa
 
2
B
 
3
Si
 
12
O
 
30
9.CM.05Roedderite
(Na,K)
 
2
(Mg,Fe)
 
5
Si
 
12
O
 
30
9.CM.05Sogdianite
(K,Na)
 
2
(Li,Fe)
 
3
(Zr,Ti,Fe)Si
 
12
O
 
30
9.CM.05Sugilite
KNa
 
2
(Fe,Mn,Al)
 
2
Li
 
3
Si
 
12
O
 
30
9.CM.05Berezanskite
KLi
 
3
Ti
 
2
Si
 
12
O
 
30
9.CM.05Dusmatovite
K(K,Na,[ ])(Mn
2+
 
,Y,Zr)
 
2
(Zn,Li)
 
3
Si
 
12
O
 
30
9.CM.05Shibkovite
K(Ca,Mn,Na)
 
2
(K
 
2-x
,□
 
x
)
 
2
Zn
 
3
Si
 
12
O
 
30
9.CM.05Almarudite
K([],Na)
 
2
(Mn
2+
 
,Fe
2+
 
,Mg)
 
2
(Be,Al)
 
3
[Si
 
12
O
 
30
]
9.CM.05Trattnerite
([],K)(Mg, Fe
2+
 
)
 
3
Fe
3+
2
[Si
 
12
O
 
30
]
9.CM.05Oftedalite
(Sc,Ca,Mn
2+
 
)
 
2
K[(Be,Al)
 
3
Si
 
12
O
 
30
]
9.CM.10Faizievite
K
 
2
Na(Ca
 
6
Na)Ti
 
4
Li
 
6
[F
 
2
|Si
 
24
O
 
66
]
Related Minerals - Hey's Index Grouping:

- +
16.8.1Preiswerkite
NaMg
 
2
Al[(OH)
 
2
|Al
 
2
Si
 
2
O
 
10
]
16.8.3Nybøite
[Na][Na
 
2
][Mg
 
3
Al
 
2
][(OH)
 
2
|AlSi
 
7
O
 
22
]
16.8.4Ferrierite
(Na,K)
 
2
MgAl
 
3
Si
 
15
O
 
36
(OH)·9H
 
2
O
16.8.6Phlogopite
KMg
 
3
[(OH,F)
 
2
|AlSi
 
3
O
 
10
]

Other Names for Yagiite

Synonyms:
IMA1968-020JageiiteYagite
Other Languages:
German:Jageiit
Yagiit
Yagit
Spanish:Jageiita
Yagiita
Yagita

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 Yagiite

Reference List:American Mineralogist (1969): 54: 14-18.

Internet Links for Yagiite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Yagiite in the Natural History Museum (London) online catalogue
  • Yagiite details from Handbook of Mineralogy (PDF)
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    Localities for Yagiite

    (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.
    Spain
     
    • Andalusia
      • Granada
    		[AM 54 (1969), 14; Nickel & Nichols, 1991 - "Mineral Reference Manual", p233]
    Mineral and/or Locality
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