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Diomignite

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Formula:
Li
 
2
[B
 
4
O
 
7
]
System:Tetragonal
Name:Named by David London, Michael E. Zolensky, and Edwin Roedder in 1987 from the Greek διοσ "divine" and μιγνεν "mixture" because of the pronounced fluxing effects the compound has on hydrous granitic pegmatite fluids. The compound is also found in industrial processes and has been found in discarded commercial waste piles near factories or near shipping docks, land-fills, etc.


Generally a microscopic mineral found in fluid inclusions in beryl or spodumene.

Classification of Diomignite

IMA status:Approved 1984
Strunz 8th edition ID:5/H.10-10
Nickel-Strunz 10th (pending) edition ID:6.DD.05

6 : BORATES
D : Tetraborates
D : Tekto-tetraborates
Dana 8th edition ID:24.5.4.1

24 : ANHYDROUS BORATES
5 : Miscellaneous
Hey's CIM Ref.:9.1.3

9 : Borates
1 : Borates of the alkalis and boric acid
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Type Occurrence of Diomignite

Type Locality:Tanco Mine (Bernic Lake Mine), Bernic Lake, Lac-du-Bonnet area, Manitoba, Canada
Year of Discovery:1984

Crystallography of Diomignite

Crystal System:Tetragonal
Cell Parameters:a = 9.47Å, c = 10.27Å
Ratio:a:c = 1 : 1.084
Unit Cell Volume:V 921.02 ų (Calculated from Unit Cell)

Optical Data of Diomignite

Type:Uniaxial (-)
RI values: nω = 1.612 nε = 1.554
Maximum Birefringence:δ = 0.058

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

Chemical Properties of Diomignite

Formula:
Li
 
2
[B
 
4
O
 
7
]
Essential elements:B, Li, O
All elements listed in formula:B, Li, O

Relationship of Diomignite to other Species

Related Minerals - Hey's Index Grouping:

- +
9.1.1Sassolite
H
 
3
BO
 
3
9.1.2Metaborite
HBO
 
2
9.1.4Biringuccite
Na
 
2
B
 
5
O
 
8
(OH) · H
 
2
O
9.1.5Nasinite
Na
 
4
B
 
10
O
 
17
 · 5H
 
2
O
9.1.6Kernite
Na
 
2
[B
 
4
O
 
6
(OH)
 
2
] · 3H
 
2
O
9.1.7Ezcurrite
Na
 
4
B
 
10
O
 
17
 · 7H
 
2
O
9.1.8Tincalconite
Na
 
2
(B
 
4
O
 
7
) · 5H
 
2
O
9.1.9Borax
Na
 
2
(B
 
4
O
 
5
)(OH)
 
4
 · 8H
 
2
O
9.1.10Ameghinite
Na(H
 
4
B
 
3
O
 
7
)
9.1.11Sborgite
Na[B
 
5
O
 
6
(OH)
 
4
] · 3H
 
2
O
9.1.12Aristarainite
Na
 
2
MgB
 
12
O
 
20
 · 8H
 
2
O
9.1.13Santite
K[B
 
5
O
 
6
(OH)
 
4
] · 2H
 
2
O
9.1.14Larderellite
(NH
 
4
)B
 
5
O
 
6
(OH)
 
4
9.1.15Ammonioborite
(NH
 
4
)
 
2
[B
 
5
O
 
6
(OH)
 
4
]
 
2
 · H
 
2
O
9.1.16Rhodizite
(K,Cs)Al
 
4
Be
 
4
(B,Be)
 
12
O
 
28

Other Names for Diomignite

Synonyms:
IMA1984-058a
Other Languages:
German:Diomignit
Spanish:Diomignita

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 Diomignite

Reference List:

- +
LONDON, D., ZOLENSKY, M.E. & ROEDDER, E. (1987): Diomignite: natural Li2B4O7 from the Tanco pegmatite, Bernic Lake, Manitoba. Canadian Mineralogist 25, 173-180.
ANDERSON, A.J., CLARK, A.H. & GRAY, S. (2001): The occurrence and origin of zabuyelite (Li2CO3) in spodumene-hosted fluid inclusions: implications for the internal evolution of rare-element granitic pegmatites. Canadian Mineralogist 39, 1513-1527.

Acta Crystallographica: 15: 190-193.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Thomas, R., Davidson, P. (2010): Hambergite-rich melt inclusions in morganite crystals from the Muiane pegmatite, Mozambique and some remarks on the paragenesis of hambergite. Mineralogy and Petrology, 100, 3-4, 227-239

Internet Links for Diomignite

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    • Localities for Diomignite

    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.
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    (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.
    Canada
     
    • Manitoba
      • Lac-du-Bonnet area
        • Bernic Lake
    		LONDON, D., ZOLENSKY, M.E. & ROEDDER, E. (1987): Diomignite: natural Li2B4O7 from the Tanco pegmatite, Bernic Lake, Manitoba. Canadian Mineralogist 25, 173-180.
    Mozambique
     
    • Zambezia Province
      • Alto Ligonha District
    		 Thomas, R., Davidson, P. (2010): Hambergite-rich melt inclusions in morganite crystals from the Muiane pegmatite, Mozambique and some remarks on the paragenesis of hambergite. - Mineralogy and Petrology, 100, 3-4, 227-23
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