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Nabesite

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Kuannersuit (Kvanefjeld) plateau, Ilimaussaq complex, Narsaq, Kitaa (West Greenland) Province, Greenland
© Thomas Witzke

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Formula:
Na
 
2
BeSi
 
4
O
 
10
 * 4 H
 
2
O
System:OrthorhombicColour:colourless to white
Hardness:5 - 6
Name:named for the chemical composition Na, Be, Si
This page provides mineralogical data about Nabesite.

Classification of Nabesite

IMA status:Approved 2000
Strunz 8th edition ID:8/J.0-
Nickel-Strunz 10th (pending) edition ID:9.EA.65

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
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Type Occurrence of Nabesite

Type Locality:Kuannersuit (Kvanefjeld) plateau, Ilimaussaq complex, Narsaq, Kitaa (West Greenland) Province, Greenland
General Appearance of Type Material:platy crystals

Physical Properties of Nabesite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Colour:colourless to white
Streak:white
Hardness (Mohs):5 - 6
Hardness Data:Measured
Cleavage:Distinct/Good
{110} and {001}
Fracture:Irregular/Uneven
Density (measured):2.16 g/cm3
Density (calculated):2.21 g/cm3

Crystallography of Nabesite

Crystal System:Orthorhombic
Class (H-M):2 2 2 - Disphenoidal
Space Group:P21 21 21
Cell Parameters:a = 9.748Å, b = 10.133Å, c = 11.954Å
Ratio:a:b:c = 0.962 : 1 : 1.18
Unit Cell Volume:V 1180.8 ų
Z:4

Optical Data of Nabesite

Type:Biaxial (-)
RI values: nα = 1.499 nβ = 1.507 nγ = 1.511
2V:Measured: 65°
Maximum Birefringence:δ = 0.012

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

Chemical Properties of Nabesite

Formula:
Na
 
2
BeSi
 
4
O
 
10
 * 4 H
 
2
O
Essential elements:Be, H, Na, O, Si
All elements listed in formula:Be, H, Na, O, Si

Relationship of Nabesite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.EA.05Cuprorivaite
CaCu[Si
 
4
O
 
10
]
9.EA.05Gillespite
BaFe
2+
 
[Si
 
4
O
 
10
]
9.EA.05Effenbergerite
BaCu[Si
 
4
O
 
10
]
9.EA.05Wesselsite
SrCu[Si
 
4
O
 
10
]
9.EA.10Ekanite
(Ca,Fe
2+
 
,Pb)
 
2
(Th,U)[Si
 
8
O
 
20
]
9.EA.15Apophyllite-(KF)
KCa
 
4
(Si
 
8
O
 
20
)(F,OH) · 8H
 
2
O
9.EA.15Apophyllite-(KOH)
KCa
 
4
(Si
 
8
O
 
20
)(OH,F) · 8H
 
2
O
9.EA.15Apophyllite-(NaF)
NaCa
 
4
(Si
 
8
O
 
20
)F · 8H
 
2
O
9.EA.20Magadiite
NaSi
 
7
O
 
13
(OH)
 
3
 · 3H
 
2
O
9.EA.25Dalyite
K
 
2
ZrSi
 
6
O
 
15
9.EA.25Davanite
K
 
2
TiSi
 
6
O
 
15
9.EA.30Sazhinite-(Ce)
Na
 
3
Ce[Si
 
6
O
 
15
] · 6H
 
2
O
9.EA.30Sazhinite-(La)
Na
 
3
La[Si
 
6
O
 
15
] · 2H
 
2
O
9.EA.35Armstrongite
CaZr[Si
 
6
O
 
15
] · 3H
 
2
O
9.EA.40Okenite
CaSi
 
2
O
 
5
 · 2H
 
2
O
9.EA.45Nekoite
Ca
 
3
Si
 
6
O
 
15
·7H
 
2
O
9.EA.50Cavansite
Ca(VO)Si
 
4
O
 
10
 · 4H
 
2
O
9.EA.55Pentagonite
Ca(VO)Si
 
4
O
 
10
 · 4H
 
2
O
9.EA.60Penkvilksite
Na
 
4
Ti
 
2
Si
 
8
O
 
22
 · 4H
 
2
O
9.EA.60Tumchaite
Na
 
2
Zr(Si
 
4
O
 
11
) · 2H
 
2
O
9.EA.70Ajoite
(K,Na)Cu
 
7
AlSi
 
9
O
 
24
(OH)
 
6
 · 3H
 
2
O
9.EA.75Zeravshanite
Na
 
2
Cs
 
4
Zr
 
3
[Si
 
18
O
 
45
]*2H
 
2
O
9.EA.80Bussyite-(Ce)
(Ce,REE)
 
3
(Na,H
 
2
O)
 
6
MnSi
 
9
Be
 
5
(O,OH)
 
30
F
 
4
9.EA.85Plumbophyllite
Pb
 
2
Si
 
4
O
 
10
 · H
 
2
O

Other Names for Nabesite

Synonyms:
IMA2000-024
Other Languages:
German:Nabesit
Russian:Набесит
Spanish:Nabesita

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 Nabesite

Reference List:

- +
Petersen, O.V., G. Giester, F. Brandstätter & G. Niedermayr (2002): Nabesite, Na2BeSi4O10·4H2O, a new mineral species from the Ilimaussaq alkaline complex, south Greenland. Canadian Mineralogist 40, 173-181.

Armstrong, J.A., Friis, H., Lieb, A., Finch, A.A., Weller, M.T. (2010): Combined single-crystal X-ray and neutron powder diffraction structure analysis exemplified through full structure determinations of framework and layer beryllate minerals. American Mineralogist, 95, 519-526.

Internet Links for Nabesite

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    • Localities for Nabesite

    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.
    Greenland
     
    • Kitaa (West Greenland) Province
      • Narsaq
        • Ilimaussaq complex
    		O.V. Petersen et al. (2002) Can. Mineral. 40, 173-181
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