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Barylite-1O

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Formula:
Be
 
2
Ba(Si
 
2
O
 
7
)
System:MonoclinicColour:colorless
Name:The monoclinic dimorph of barylite.
A polytype of Barylite

Originally named "clinobarylite"; discredited in 2014 (IMA 13-E).

Classification of Barylite-1O

IMA status:Approved 2002
Nickel-Strunz 10th (pending) edition ID:9.BB.15

9 : SILICATES (Germanates)
B : Sorosilicates
B : Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination
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Type Occurrence of Barylite-1O

Type Locality:Hackman Valley, Yukspor Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
General Appearance of Type Material:Radial aggregates and platy to prismatic crystals.
Place of Conservation of Type Material:Fersman Mineralogical Museum, Moscow, Russia
Geological Setting of type material:Alkaline pegmatite.
Associated Minerals at type locality:
NatroliteMicroclineFluorapatiteCatapleiiteAstrophyllite
AnniteAegirine

Physical Properties of Barylite-1O

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:colorless
Tenacity:Brittle
Cleavage:Perfect
Perfect {100} and less perfect {001} and {101}.
Density (measured):3.97(7) g/cm3
Density (calculated):4.05 g/cm3

Crystallography of Barylite-1O

Crystal System:Monoclinic
Class (H-M):m - Domatic
Space Group:Pm {P1 1m} {Pm} {P1m1}
Cell Parameters:a = 11.618(3) Å, b = 4.904(1) Å, c = 4.655(1) Å
β = 89.94(2)°
Ratio:a:b:c = 2.369 : 1 : 0.949
Unit Cell Volume:V 265.22 ų (Calculated from Unit Cell)
Z:2
X-Ray Powder Diffraction:
d-spacingIntensity
3.389 (84)
3.249 (45)
3.043 (40)
2.926 (55)
2.458 (100)
2.335 (48)

Optical Data of Barylite-1O

Type:Biaxial (+)
RI values: nα = 1.698(3) nβ = 1.700(3) nγ = 1.705(5)
2V:Measured: 70° (10), Calculated: 65°
Maximum Birefringence:δ = 0.007

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

Chemical Properties of Barylite-1O

Formula:
Be
 
2
Ba(Si
 
2
O
 
7
)
Simplified for copy/paste:Be2Ba(Si2O7)
Essential elements:Ba, Be, O, Si
All elements listed in formula:Ba, Be, O, Si

Relationship of Barylite-1O to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.BB.10Åkermanite
Ca
 
2
Mg(Si
 
2
O
 
7
)
9.BB.10Cebollite
Ca
 
5
Al
 
2
(SiO
 
4
)
 
3
(OH)
 
4
9.BB.10Gehlenite
Ca
 
2
Al(AlSiO
 
7
)
9.BB.10Gugiaite
Ca
 
2
Be(Si
 
2
O
 
7
)
9.BB.10Hardystonite
Ca
 
2
Zn(Si
 
2
O
 
7
)
9.BB.10Jeffreyite
(Ca,Na)
 
2
(Be,Al)(Si
 
2
O
 
7
,HSi
 
2
O
 
7
)
9.BB.10Okayamalite
Ca
 
2
B(BSiO
 
7
)
9.BB.10Alumoåkermanite
(Ca,Na)
 
2
(Al,Mg,Fe
2+
 
)(Si
 
2
O
 
7
)
9.BB.15Barylite
Be
 
2
Ba(Si
 
2
O
 
7
)
9.BB.20Andrémeyerite
BaFe
2+
2
(Si
 
2
O
 
7
)

Other Names for Barylite-1O

Other Languages:
Russian:Клинобарилит
Simplified Chinese:单斜硅钡铍石
Traditional Chinese:單斜矽鋇鈹石

Other Information

Health Warning:Powder of the mineral is toxic as any other mineral containing Be.

References for Barylite-1O

Reference List:

- +
Chukanov, N.V., Pekov, I.V., Rastsvetaeva, R.K..,Chilov, G.V. & Zadov, A.E. (2003): Clinobarylite, BaBe2Si2O7, a new mineral from Khibiny massif, Kola peninsula. Zap. Vser. Miner. Obshch., 132, 29-37 (in Russ.). [abstract: Am. Min. 89 (2004) 249]

Rastsvetaeva, R.K. & Chukanov, N.V. (2003): Crystal structure and microtwinning of the new mineral clinobarylite BaBe2Si2O7. Doklady Chemistry, 188, 23-25.

Krivovichev, S.V., Yakovenchuk, V.N., Armbruster, T., Mikhailova, Yu., & Pakhomovsky, Ya.A. (2004): Clinobarylite, BaBe2Si2O7: structure refinement, and revision of symmetry and physical properties. Neues Jahrb. Mineral., Mh. 2004, 373-384. [Abstract: Am. Min. 90 (2005) 522]

Internet Links for Barylite-1O

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  • Localities for Barylite-1O

    (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
          • Khibiny Massif
            • Eveslogchorr Mt
    P.M. Kartashov data
            • Yukspor Mt
    Chukanov, N.V., Pekov, I.V., Rastsvetaeva, R.K..,Chilov, G.V. & Zadov, A.E. Zap. Vser. Miner.Obshch.,132: 29-37 (in Russ.)
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