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Barylite-1O

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Formula:
Be2Ba(Si2O7)
System:
Monoclinic
Colour:
colorless
Name:
The monoclinic dimorph of barylite.
A polytype of Barylite

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

Classification of Barylite-1O

Approved 2002
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

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.

Physical Properties of Barylite-1O

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

Crystallography of Barylite-1O

Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Pm
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 Data:
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°
Max Birefringence:
δ = 0.007
Image 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:
Be2Ba(Si2O7)
Essential elements:
All elements listed in formula:

Relationship of Barylite-1O to other Species

9.BB.10ÅkermaniteCa2Mg(Si2O7)
9.BB.10CebolliteCa5Al2(SiO4)3(OH)4
9.BB.10GehleniteCa2Al(AlSiO7)
9.BB.10GugiaiteCa2Be(Si2O7)
9.BB.10HardystoniteCa2Zn(Si2O7)
9.BB.10Jeffreyite(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)
9.BB.10OkayamaliteCa2B(BSiO7)
9.BB.10Alumoåkermanite(Ca,Na)2(Al,Mg,Fe2+)(Si2O7)
9.BB.15BaryliteBe2Ba(Si2O7)
9.BB.20AndrémeyeriteBaFe22+(Si2O7)

Other Names for Barylite-1O

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

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

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

Localities for Barylite-1O

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.)
Mineral and/or Locality  
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