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Barylite-1O

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Formula:
Be2Ba(Si2O7)
Colour:
colorless
Lustre:
Vitreous
Specific Gravity:
3.97
Crystal System:
Monoclinic
Name:
The monoclinic dimorph of barylite.
A polytype of Barylite

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


Hide all sections | Show all sections

Classification of Barylite-1OHide

Discredited
9.BB.15

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

Physical Properties of Barylite-1OHide

Vitreous
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)

Optical Data of Barylite-1OHide

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-1OHide

Formula:
Be2Ba(Si2O7)

Crystallography of Barylite-1OHide

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 V:
265.22 ų (Calculated from Unit Cell)
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.389 (84)
3.249 (45)
3.043 (40)
2.926 (55)
2.458 (100)
2.335 (48)

First Recorded Occurrence of Barylite-1OHide

General Appearance of First Recorded Material:
Radial aggregates and platy to prismatic crystals.
Place of Conservation of First Recorded Material:
Fersman Mineralogical Museum, Moscow, Russia
Geological Setting of First Recorded Material:
Alkaline pegmatite.
Associated Minerals at First Recorded Locality:

Synonyms of Barylite-1OHide

Other Language Names for Barylite-1OHide

Simplified Chinese:单斜硅钡铍石
Traditional Chinese:單斜矽鋇鈹石

Related Minerals - Nickel-Strunz GroupingHide

9.BB.10ÅkermaniteCa2Mg(Si2O7)Tet. 4 2m : P4 21m
9.BB.10CebolliteCa5Al2(SiO4)3(OH)4Orth.
9.BB.10GehleniteCa2Al(AlSiO7)Tet. 4 2m : P4 21m
9.BB.10GugiaiteCa2Be(Si2O7)Tet.
9.BB.10HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
9.BB.10Jeffreyite(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)Orth.
9.BB.10OkayamaliteCa2B(BSiO7)Tet.
9.BB.10Alumoåkermanite(Ca,Na)2(Al,Mg,Fe2+)(Si2O7)Tet. 4 2m : P4 21m
9.BB.15BaryliteBe2Ba(Si2O7)Orth.
9.BB.20AndrémeyeriteBaFe2+2(Si2O7)Mon.

Other InformationHide

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

References for Barylite-1OHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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-1OHide

Localities for Barylite-1OHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia
 
  • Northern Region
    • Murmanskaya Oblast'
      • 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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