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Yamatoite

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Formula:
(Mn
2+
 
,Ca)
 
3
(V
3+
 
,Al)
 
2
(SiO
 
4
)
 
3
System:IsometricHardness:6 - 7
Name:For the Yamato manganese mine.


Discredited member of Garnet Group. Submitted as IMA 2009-026 (Momoiite) using material from a different locality.

Originally reported from Yamato mine, Amami-Oshima Island, Kagoshima Prefecture, Nansei Archipelago, Japan.

Classification of Yamatoite

IMA status:Discredited 1967
Explanation of status:"Yamatoite" from the Yamato manganese mine is a Mn-rich goldmanite with 40-50% of the "yamatoite" "molecule". Nowadays the name "yamatoite" is still used for the hypothetical Mn-V-dominant garnet molecule and for synthesized equivalents.
Strunz 8th edition ID:8/A.08-138

8 : Silicates
A : Nesosilicates, with [SiO4]4- groups, cations of tetrahedric orientation [4]
08 : Garnet group, Pyrope - Henritermierite
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Physical Properties of Yamatoite

Hardness (Mohs):6 - 7

Crystallography of Yamatoite

Crystal System:Isometric

Optical Data of Yamatoite

Type:Isotropic

Chemical Properties of Yamatoite

Formula:
(Mn
2+
 
,Ca)
 
3
(V
3+
 
,Al)
 
2
(SiO
 
4
)
 
3
Essential elements:Mn, O, Si, V
All elements listed in formula:Al, Ca, Mn, O, Si, V

Relationship of Yamatoite to other Species

Related Minerals - Strunz Grouping):

- +
8/A.08-10Pyrope
Mg
 
3
Al
 
2
(SiO
 
4
)
 
3
8/A.08-20Almandine
Fe
2+
3
Al
 
2
(SiO
 
4
)
 
3
8/A.08-30Spessartine
Mn
2+
3
Al
 
2
(SiO
 
4
)
 
3
8/A.08-40Calderite
(Mn
2+
 
,Ca)
 
3
(Fe
3+
 
,Al)
 
2
(SiO
 
4
)
 
3
8/A.08-50Knorringite
Mg
 
3
Cr
 
2
(SiO
 
4
)
 
3
8/A.08-60Majorite
Mg
 
3
(Fe
2+
 
,Si,Al)
 
2
(SiO
 
4
)
 
3
8/A.08-70Grossular
Ca
 
3
Al
 
2
(SiO
 
4
)
 
3
8/A.08-80Hibschite
Ca
 
3
Al
 
2
(SiO
 
4
)
 
3-x
(OH)
 
4x
8/A.08-90Katoite
Ca
 
3
Al
 
2
(SiO
 
4
)
 
3-x
(OH)
 
4x
8/A.08-100Hydrougrandite
(Ca,Mg,Fe
2+
 
)
 
3
(Fe
3+
 
,Al)
 
2
[(OH)
 
4
|(SiO
 
4
)
 
2
]
8/A.08-110Andradite
Ca
 
3
Fe
3+
2
(SiO
 
4
)
 
3
8/A.08-120Schorlomite
Ca
 
3
(Ti,Fe
3+
 
)
 
2
((Si,Fe
3+
 
)O
 
4
)
 
3
8/A.08-125Morimotoite
Ca
 
3
(Ti,Fe
2+
 
,Fe
3+
 
)
 
2
((Si,Fe
3+
 
)O
 
4
)
 
3
8/A.08-130Uvarovite
Ca
 
3
Cr
 
2
(SiO
 
4
)
 
3
8/A.08-140Goldmanite
Ca
 
3
V
3+
2
(SiO
 
4
)
 
3
8/A.08-150Kimzeyite
Ca
 
3
(Zr,Ti)
 
2
((Si,Al,Fe
3+
 
)O
 
4
)
 
3
8/A.08-155Wadalite
(Ca,Mg)
 
6
(Al,Fe
3+
 
)
 
4
((Si,Al)O
 
4
)
 
3
O
 
4
Cl
 
3
8/A.08-160Henritermierite
Ca
 
3
(Mn
3+
 
,Al)
 
2
(SiO
 
4
)
 
2
(OH)
 
4

Other Names for Yamatoite

Other Languages:
German:Yamatoit
Spanish:Yamatoita

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 Yamatoite

Reference List:

- +
Momoi (1964) Memoirs of the Faculty of Science, Kyushu University, series D, 15, 73-78.

Mineral. Mag. (1967), 36, 133.

Internet Links for Yamatoite

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    • Localities for Yamatoite

    Hide Locality List
    (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.
    Japan
     
    • Kyushu Region
      • Nansei Archipelago
        • Kagoshima Prefecture
          • Amami-Oshima Island
    		Momoi (1964) Memoirs of the Faculty of Science, Kyushu University, series D,　15, 73-78.
    • Shikoku Island
      • Ehime Prefecture
        • Saijo City
    		Gunnar Farber specimens
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