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Bario-olgite

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Palitra pegmatite (Palette pegmatite), Kedykverpakhk Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© 2007, JGW




Formula:
(Ba,Sr)(Na,Sr,REE)
 
2
Na(PO
 
4
)
 
2
 ·
System:TrigonalColour:light green
Hardness:4 - 4½
Name:For the chemical composition and its relationship to olgite


Originally considered to be Ba(Na,Sr,REE)2Na[PO4]2, the barium-dominant analogue of olgite, but then proposed for discreditation after the crystal structure of olgite was revised and found to be also Ba-dominant [Sokolowa, E. et al. (2005)]. However, since then, Sr-dominant olgites have been found and the discreditation proposal has been withdrawn. "Olgite" itself may in future become a series name rather than a species, and bario-olgite now has the revised formula (Ba,Sr)(Na,Sr,REE)2Na[PO4]2.

See also message http://www.mindat.org/mesg-14-95789.html

Classification of Bario-olgite

IMA status:Approved 2005
Strunz 8th edition ID:7/A.12-70
Nickel-Strunz 10th (pending) edition ID:8.AC.40

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
C : With medium-sized and large cations
Dana 8th edition ID:38.1.3.2

38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
1 : ABXO4
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Type Occurrence of Bario-olgite

Type Locality:Palitra pegmatite (Palette pegmatite), Kedykverpakhk Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
General Appearance of Type Material:grains up to 1.5 x 1 cm and, more rarely, pyramidal-prismatic crystals
Geological Setting of type material:hyeragpaitic pegmatite
Associated Minerals at type locality:
VuonnemiteVilliaumiteUssingiteSodaliteSérandite
NatrosiliteManaksiteChkaloviteAegirine

Physical Properties of Bario-olgite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:light green
Hardness (Mohs):4 - 4½
Density (measured):4 g/cm3

Crystallography of Bario-olgite

Crystal System:Trigonal
Class (H-M):3 - Pyramidal
Space Group:P3
Cell Parameters:a = 5.549Å, c = 7.032Å
Ratio:a:c = 1 : 1.267
Unit Cell Volume:V 187.5 ų
Z:1
X-Ray Powder Diffraction:
d-spacingIntensity
2.839(100)
2.774(100)
3.964(60)
1.984(40)
1.611(26)

Optical Data of Bario-olgite

Type:Uniaxial
RI values: nω = 1.628 nε = 1.623
Maximum Birefringence:δ = 0.005

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

Chemical Properties of Bario-olgite

Formula:
(Ba,Sr)(Na,Sr,REE)
 
2
Na(PO
 
4
)
 
2
 ·
Essential elements:Ba, Na, O, P
All elements listed in formula:Ba, Na, O, P, Sr
Analytical Data:by electron microprobe analysis
Na2O (14.78)
K2O (0.87)
CaO (0.32)
SrO (16.57)
BaO (31.17)
MnO (0.39)
La2O3 (2.41)
Ce2O3 (1.90)
Pr2O3 (0.10)
Nd2O3 (0.16)
SiO2 (0.08)
P2O5 (31.77)
Common Impurities:Sr,La,Ce,Ca,K,Mn,Si

Relationship of Bario-olgite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.AC.05Howardevansite
NaCuFe
 
2
(VO
 
4
)
 
3
8.AC.10Alluaudite
(Na,Ca)Mn
2+
 
(Fe
3+
 
,Mn
2+
 
,Fe
2+
 
,Mg)
 
2
(PO
 
4
)
 
3
8.AC.10Arseniopleite
NaCaMn
2+
 
(Mn
2+
 
,Mg)
 
2
(AsO
 
4
)
 
3
8.AC.10Caryinite
(Na,Pb)(Ca,Na)(Ca,Mn
2+
 
)(Mn
2+
 
,Mg,Fe
3+
 
)
 
2
(AsO
 
4
)
 
3
8.AC.10Ferroalluaudite
(Na,Ca)Fe
2+
 
(Fe
3+
 
,Mn
2+
 
,Fe
2+
 
)
 
2
(PO
 
4
)
 
3
8.AC.10Hagendorfite
NaCaMn
2+
 
Fe
2+
2
(PO
 
4
)
 
3
8.AC.10Johillerite
Na(Mg,Zn)
 
3
Cu(AsO
 
4
)
 
3
8.AC.10Maghagendorfite
NaMn(Mg,Fe,Fe)
 
3
(PO
 
4
)
 
3
8.AC.10Nickenichite
Na
 
0.8
Ca
 
0.4
Cu
 
0.4
(Mg,Fe)
 
3
(AsO
 
4
)
 
3
8.AC.10Varulite
NaCaMn
2+
 
Mn
2+
2
(PO
 
4
)
 
3
8.AC.10Ferrohagendorfite
NaCaFe
2+
 
Fe
2+
2
(PO
 
4
)
 
3
8.AC.10Bradaczekite
NaCu
 
4
(AsO
 
4
)
 
3
8.AC.10Yazganite
NaFe
3+
2
(Mg,Mn
2+
 
)(AsO
 
4
)
 
3
 · H
 
2
O
8.AC.10Groatite
NaCaMn
 
2
(PO
 
4
)(HPO
 
4
)
 
2
8.AC.15Bobfergusonite
Na
 
2
Mn
 
5
FeAl(PO
 
4
)
 
6
8.AC.15Ferrowyllieite
(Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO
 
4
)
 
3
8.AC.15Qingheiite
NaMn
3+
 
Mg(Al,Fe
3+
 
)(PO
 
4
)
 
3
8.AC.15Rosemaryite
(Na,Ca,Mn)(Mn,Fe
2+
 
)(Fe
3+
 
,Mg)Al(PO
 
4
)
 
3
8.AC.15Wyllieite
(Na,Ca,Mn)(Mn,Fe)(Fe,Mg)Al(PO
 
4
)
 
3
8.AC.15Ferrorosemaryite
◻NaFe
2+
 
Fe
3+
 
Al(PO
 
4
)
 
3
8.AC.15Qingheiite-(Fe2+)
Na
 
2
Fe
2+
 
MgAl(PO
 
4
)
 
3
8.AC.18Manitobaite
Na
 
16
Mn
2+
 
 
25
Al
 
8
(PO
 
4
)
 
30
8.AC.20Marićite
NaFe
2+
 
(PO
 
4
)
8.AC.25Berzeliite
NaCa
 
2
(Mg,Mn
2+
 
)
 
2
(AsO
 
4
)
 
3
8.AC.25Manganberzeliite
(Ca,Na)
 
3
(Mn
2+
 
,Mg)
 
2
(AsO
 
4
)
 
3
8.AC.25Palenzonaite
(Ca,Na)
 
3
CaMn
2+
2
(VO
 
4
)
 
3
8.AC.25Schäferite
Ca
 
2
NaMg
 
2
(VO
 
4
)
 
3
8.AC.30Brianite
Na
 
2
CaMg(PO
 
4
)
 
2
8.AC.35Vitusite-(Ce)
Na
 
3
(Ce,La,Nd)(PO
 
4
)
 
2
8.AC.40Olgite
(Sr,Ba)(Na,Sr,REE)
 
2
Na(PO
 
4
)
 
2
8.AC.45Strontiowhitlockite
Sr
 
9
Mg(PO
 
4
)
 
6
(HPO
 
4
)
8.AC.45Whitlockite
Ca
 
9
Mg(PO
 
4
)
 
6
(HPO
 
4
)
8.AC.45Merrillite
Ca
 
9
NaMg(PO
 
4
)
 
7
8.AC.45Tuite
Ca
 
3
(PO
 
4
)
 
2
8.AC.45Ferromerrillite
Ca
 
9
NaFe
2+
 
(PO
 
4
)
 
7
8.AC.45Bobdownsite
Ca
 
9
Mg(PO
 
4
)
 
6
(PO
 
3
F)
8.AC.50Chladniite
{Ca}{Na
 
8
}{Ca
 
4
Na
 
4
}{(Mg,Fe
2+
 
)
 
43
}(PO
 
4
)
 
36
8.AC.50Fillowite
{Mn
2+
 
}{Na
 
8
}{Ca
 
4
Na
 
4
}{(Mn
2+
 
,Fe
2+
 
)
 
43
}(PO
 
4
)
 
36
8.AC.50Johnsomervilleite
{Ca}{Na
 
6
[ ]
 
2
}{Ca
 
6
Na
 
2
}{(Fe
2+
 
,Mg,Mn
2+
 
)
 
43
}(PO
 
4
)
 
36
8.AC.50Galileiite
{Fe
2+
 
}{Na
 
8
}{Fe
2+
4
Na
 
4
}{Fe
2+
43
}(PO
 
4
)
 
36
8.AC.50Stornesite-(Y)
{(Y, Ca)}{Na
 
6
◻
 
2
}{(Ca,Na)
 
8
}{(Mg,Fe
2+
 
)
 
43
}(PO
 
4
)
 
36
8.AC.50Xenophyllite
Na
 
4
Fe
2+
7
(PO
 
4
)
 
6
8.AC.55Harrisonite
Ca(Fe
2+
 
,Mg)
 
6
(PO
 
4
)
 
2
(SiO
 
4
)
 
2
8.AC.60Kosnarite
KZr
 
2
(PO
 
4
)
 
3
8.AC.65Panethite
(Na,Ca)
 
2
(Mg,Fe
2+
 
)
 
2
(PO
 
4
)
 
2
8.AC.70Stanfieldite
Ca
 
7
Ca
 
2
Mg
 
9
(PO
 
4
)
 
12
8.AC.75Ronneburgite
K
 
2
MnV
 
4
O
 
12
8.AC.80Tillmannsite
(Ag
 
3
Hg)(VO
 
4
,AsO
 
4
)
8.AC.85Filatovite
K(Al,Zn)
 
2
(As,Si)
 
2
O
 
8

Other Names for Bario-olgite

Synonyms:
IMA2003-002
Other Languages:
German:Bario-Olgit
Russian:Бариоольгит

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 Bario-olgite

Reference List:

- +
Sokolova, E.V., Nadezhina, T.N., and Khomyakov, A.P. (1990) The X-ray diffraction study of highly barium-enriched olgite. Vestnik MGU, ser. Geology N1: 87-91 (in Russian).

Pekov, I.V., N.V. Chukanov, I.M. Kulikova, N.V. Zubkova, O.D. Krotova, N.I. Sorokina, D.Yu. Pushcharovsky (2004): "New mineral bario-olgite, Ba(Na,Sr,REE)2Na[PO4]2, and its crystal structure", Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 133(1): 41-49.

Sokolova, E., Hawthorne, F.C., and Khomyakov, A.P. (2005), Refinement of the crystal structure and revision of the chemical formula of olgite: (Ba,Sr)(Na,Sr,REE)2Na(PO4)2. Canadian Mineralogist: 43: 1521-1526.

Internet Links for Bario-olgite

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    • Localities for Bario-olgite

    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.
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Lovozero Massif
            • Kedykverpakhk Mt
    		I. V. Pekov, N. V. Chukanov, I. M. Kulikova, N. V. Zubkova, O. D. Krotova, N. I. Sorokina, D. Yu. Pushcharovsky: Proc. Russ. Min. Soc. 133(1):41-49 (2004)
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