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Diaoyudaoite

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Formula:
NaAl
 
11
O
 
17
System:HexagonalColour:Colourless, light green
Lustre:VitreousHardness:7½ - 8
Name:Named for Diaoyudao Island, the Chinese name for the Senkaku islands.


NOTE: There is strong suspicion that diaoyudaoite, from all its known localities, is an INDUSTRIAL WASTE product (from chromium refining, corundum synthesis, etc.) and not a natural mineral.

Classification of Diaoyudaoite

IMA status:Approved 1985
Explanation of status:Perhaps an industrial waste product dumped into the ocean and not a true mineral.
Strunz 8th edition ID:4/B.08-10
Nickel-Strunz 10th (pending) edition ID:4.CC.45

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
C : Metal: Oxygen = 2: 3,3: 5, and similar
C : With large and medium-sized cations
Dana 8th edition ID:7.11.12.1

7 : MULTIPLE OXIDES
11 : Miscellaneous
Hey's CIM Ref.:7.2.2

7 : Oxides and Hydroxides
2 : Oxides of the alkali metals
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Type Occurrence of Diaoyudaoite

Type Locality:Okinawa Trough, Senkaku Islands (Diaoyudao Islands; Diaoyutai Islands), Okinawa Prefecture, Nansei Archipelago, Kyushu Region, Japan
Year of Discovery:1985
Geological Setting of type material:Seafloor mud.

Occurrences of Diaoyudaoite

Geological Setting:Slag piles, waste dumps, and sites of illegal toxic waste dumping.

Physical Properties of Diaoyudaoite

Lustre:Vitreous
Colour:Colourless, light green
Hardness (Mohs):7½ - 8

Crystallography of Diaoyudaoite

Crystal System:Hexagonal
Cell Parameters:a = 5.6Å, c = 22.62Å
Ratio:a:c = 1 : 4.039
Unit Cell Volume:V 614.33 ų (Calculated from Unit Cell)

Optical Data of Diaoyudaoite

Type:Uniaxial (-)
RI values: nω = 1.688 nε = 1.663
Maximum Birefringence:δ = 0.025

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

Chemical Properties of Diaoyudaoite

Formula:
NaAl
 
11
O
 
17
Simplified for copy/paste:NaAl11O17
Essential elements:Al, Na, O
All elements listed in formula:Al, Na, O
Common Impurities:Cr

Relationship of Diaoyudaoite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.CC.05Chrombismite
Bi
 
16
CrO
 
27
4.CC.10Freudenbergite
Na
 
2
(Ti,Fe)
 
8
O
 
16
4.CC.15Grossite
CaAl
 
4
O
 
7
4.CC.20Mayenite
Ca
 
12
Al
 
14
O
 
33
4.CC.20Brearleyite
Ca
 
12
Al
 
14
O
 
32
Cl
 
2
4.CC.25Yafsoanite
Ca
 
3
Zn
 
3
(TeO
 
6
)
 
2
4.CC.30Latrappite
(Ca,Na)(Nb,Ti,Fe)O
 
3
4.CC.30Lueshite
NaNbO
 
3
4.CC.30Natroniobite
NaNbO
 
3
4.CC.30Perovskite
CaTiO
 
3
4.CC.30Barioperovskite
BaTiO
 
3
4.CC.30Lakargiite
Ca(Zr,Sn,Ti)O
 
3
4.CC.30Megawite
CaSnO
 
3
4.CC.35Loparite-(Ce)
(Na,Ce,Ca,Sr,Th)(Ti,Nb,Fe)O
 
3
4.CC.35Macedonite
PbTiO
 
3
4.CC.35Tausonite
SrTiO
 
3
4.CC.35Isolueshite
(Na,La,Ca)(Nb,Ti)O
 
3
4.CC.40Crichtonite
(Sr,La,Ce,Y)(Ti,Fe
3+
 
,Mn)
 
21
O
 
38
4.CC.40Davidite-(Ce)
(Ce,La)(Y,U,Fe)(Ti,Fe)
 
20
(O,OH)
 
38
4.CC.40Davidite-(La)
(La,Ce)(Y,U,Fe)(Ti,Fe)
 
20
(O,OH)
 
38
4.CC.40Davidite-(Y)
(La,Ce,Na,Ca,Pb)(Y,Fe
2+
 
,◻)(Fe
2+
 
,Mn
2+
 
)
 
2
(Ti,Fe
3+
 
,Nb,Zr)
 
18
O
 
38
(hypothetical)
4.CC.40Landauite
NaMnZn
 
2
(Ti,Fe)
 
6
Ti
 
12
O
 
38
4.CC.40Lindsleyite
(Ba,Sr)(Ti,Zr,Fe,Cr)
 
21
O
 
38
4.CC.40Loveringite
(Ca,Ce)(Ti,Fe,Cr,Mg)
 
21
O
 
38
4.CC.40Mathiasite
K(Ti,Cr,Fe,Mg,Zr)
 
21
O
 
38
4.CC.40Senaite
Pb(Ti,Fe,Mn)
 
21
O
 
38
4.CC.40Dessauite-(Y)
(Sr,Pb)(Y,U)(Ti,Fe
3+
 
)
 
20
O
 
38
4.CC.40Cleusonite
(Pb,Sr)(U
4+
 
,U
6+
 
)(Fe
2+
 
,Zn)
 
2
(Ti,Fe
2+
 
,Fe
3+
 
)
 
18
(O,OH)
 
38
4.CC.40Gramaccioliite-(Y)
(Pb,Sr)(Y,Mn)Fe
3+
2
(Ti,Fe
3+
 
)
 
18
O
 
38
4.CC.45Hawthorneite
Ba(MgTi
 
3
Cr
 
4
Fe
 
4
)O
 
19
4.CC.45Hibonite
(Ca,Ce)Al
 
12
O
 
19
4.CC.45Lindqvistite
Pb
 
2
Mn
2+
 
Fe
 
16
O
 
27
4.CC.45Magnetoplumbite
(Pb,Mn)(Fe,Mn)
 
12
O
 
19
4.CC.45Plumboferrite
Pb
 
2
Fe
3+
11-x
Mn
2+
x
O
 
19-2x
, x = 1/3
4.CC.45Yimengite
K(Cr,Ti,Fe,Mg)
 
12
O
 
19
4.CC.45Haggertyite
Ba[Fe
2+
6
Ti
 
5
Mg]O
 
19
4.CC.45Nežilovite
PbZn
 
2
(Mn
4+
 
,Ti
4+
 
)
 
2
Fe
3+
8
O
 
19
4.CC.45Batiferrite
Ba[Ti
 
2
Fe
3+
8
Fe
2+
2
]O
 
19
4.CC.45Hibonite-(Fe)
(Fe,Mg)Al
 
12
O
 
19
4.CC.45Barioferrite
BaFe
3+
12
O
 
19
4.CC.50Jeppeite
(K,Ba)
 
2
(Ti,Fe)
 
6
O
 
13
4.CC.55Zenzénite
Pb
 
3
(Fe,Mn)
 
4
Mn
 
3
O
 
13
4.CC.60Mengxianminite
(Ca,Na)
 
3
(Fe,Mn)
 
2
Mg
 
2
(Sn,Zn)
 
5
Al
 
8
O
 
29
Related Minerals - Hey's Index Grouping:

- +
7.2.1Lithiophorite
(Al,Li)MnO
 
2
(OH)
 
2
7.2.3Manjiroite
Na(Mn
4+
7
Mn
3+
 
)O
 
16
7.2.4Cryptomelane
K(Mn
4+
7
Mn
3+
 
)O
 
16

Other Names for Diaoyudaoite

Synonyms:
IMA1985-005
Other Languages:
German:Diaoyudaoit
Russian:Дяоюдаоит
Spanish:Diaoyudaoita

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 Diaoyudaoite

Reference List:

- +
Shen Shunxi, Chen Lirong, Li Anchun, Dong Tailu, Huang Qiuhuo, and Xu Wenqiang (1986): Diaoyudaoite - A new mineral. Acta Mineralogica Sinica 6(3), 224-227 (in Chinese with English abstract). - American Mineralogist (1987), 75, 240 (abstract).

Zhu, Naijue; Guo, Fang; Li, Yan; Shen, Shunxi; Chen, Lirong; Li, Anchun. (1992): Study on crystal structure of diaoyudaoite. Huaxue Xuebao 50, 527-32. (in Chinese).

Ye, Ying; Shen, Zhongyue; Shimizu, Masaaki; Shimazaki, Hidehiko (1998): Comparison between metallurgical byproduct beta-NaAl11O17 and diaoyudaoite and discussion on the possible source of diaoyudaoite. Kuangwu Xuebao 18, 97-100. (in Chinese).

Internet Links for Diaoyudaoite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Diaoyudaoite details from Handbook of Mineralogy (PDF)
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  • Localities for Diaoyudaoite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (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.
    Germany
     
    • Lower Saxony
      • Harz
        • Altenau
    Schnorrer-Köhler, G. (1991): Mineralogische Notizen V. Aufschluss 42, 155-171.
    Japan
     
    • Kyushu Region
      • Nansei Archipelago
        • Okinawa Prefecture
          • Senkaku Islands (Diaoyudao Islands; Diaoyutai Islands)
    Shunxi Shen, Lirong Chen, Anchun Li, Tailu Dong, Qiuhuo Huang, and Wenqiang Xu (1986): Acta Mineralogica Sinica 6(3), 224-227
    Norway
     
    • Telemark
      • Nome
        • Fen complex
          • Søve Mines
    Dahlgren, S. (2005): Miljøgeologisk undersøkelse av lavradioaktivt slagg fra ferroniobproduksjonen ved Norsk Bergverk på Søve 1956-1965. Regiongeologen for Buskerud, Telemark og Vestfold, Rapport nt 1, 2005. 19-28.
    Russia
     
    • Western-Siberian Region
      • Novosibirsk Oblast'
    Excalibur Mineral specimen (anthropogenic)
    USA
     
    • Massachusetts
      • Hampden Co.
        • Chester
          • Chester Emery Mines
    Kevin Downey specimens (confirmed by PXRD by John Attard)
    • New Jersey
      • Essex Co.
        • Newark
    Josef Vajdak (analysis by Petr Ondrush & F. Veselovsky, Czech Geol. Survey).
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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