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Barylite-1O
A structural variant of Barylite
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About Barylite-1O
Formula:
Be2Ba(Si2O7)
Colour:
colorless
Lustre:
Vitreous
Specific Gravity:
3.97
Crystal System:
Monoclinic
Name:
The monoclinic dimorph of barylite.
First Recorded Locality:
Unique Identifiers
Mindat ID:
29078
Long-form identifier:
mindat:1:1:29078:8
Similar Names
| Baralite | A synonym of 'Bavalite' | |
| Barolite (of Kirwan) | A synonym of Witherite | |
| Berylite | A synonym of Beryl | |
| Beryllite | A valid IMA mineral species - grandfathered | Be3(SiO4)(OH)2 · H2O |
IMA Classification of Barylite-1O
Discredited
Classification of Barylite-1O
9.BB.15
9 : SILICATES (Germanates)
B : Sorosilicates
B : Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination
9 : SILICATES (Germanates)
B : Sorosilicates
B : Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination
Physical Properties of Barylite-1O
Vitreous
Transparency:
Transparent
Colour:
Colorless
Tenacity:
Brittle
Cleavage:
Perfect
Perfect {100} and less perfect {001} and {101}.
Perfect {100} and less perfect {001} and {101}.
Density:
3.97(7) g/cm3 (Measured) 4.05 g/cm3 (Calculated)
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
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Chemistry of Barylite-1O
Mindat Formula:
Be2Ba(Si2O7)
Element Weights:
Elements listed:
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)°
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 Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.389 Å | (84) |
| 3.249 Å | (45) |
| 3.043 Å | (40) |
| 2.926 Å | (55) |
| 2.458 Å | (100) |
| 2.335 Å | (48) |
Comments:
X-ray Powder Pattern: Khibiny, Kola, Russia. (Barylite-1O)
2.923 (100), 2.981 (95), 3.381 (80), 5.80 (79), 3.043 (78), 2.075 (54), 1.682 (53)
2.923 (100), 2.981 (95), 3.381 (80), 5.80 (79), 3.043 (78), 2.075 (54), 1.682 (53)
First Recorded Occurrence of Barylite-1O
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-1O
Other Language Names for Barylite-1O
Related Minerals - Strunz-mindat Grouping
| 9.BB.10 | Hardystonite | Ca2Zn[Si2O7] |
| 9.BB.10 | Okayamalite | Ca2B[BSiO7] |
| 9.BB.10 | Jeffreyite | (Ca,Na)2(Be,Al)(Si2O7,HSi2O7) |
| 9.BB.10 | Alumoåkermanite | (CaNa)Al[Si2O7] |
| 9.BB.10 | Åkermanite | Ca2Mg[Si2O7] |
| 9.BB.10 | 'Ferri-gehlenite' | Ca2Fe3+[AlSiO7] |
| 9.BB.10 | Gehlenite | Ca2Al[AlSiO7] |
| 9.BB.10 | Ferroåkermanite | Ca2Fe[Si2O7] |
| 9.BB.10 | Cebollite | Ca5Al2(SiO4)3(OH)4 |
| 9.BB.10 | Hydroxylgugiaite | (Ca,◻)2(Si,Be)[(Be,Si)2O5.5(OH)1.5] |
| 9.BB.10 | Gugiaite | Ca2Be[Si2O7] |
| 9.BB.15 | Barylite | Be2Ba(Si2O7) |
| 9.BB.20 | Bennesherite | Ba2Fe2+[Si2O7] |
| 9.BB.20 | Andrémeyerite | BaFe2+2(Si2O7) |
Other Information
Health Risks:
Powder of the mineral is toxic as any other mineral containing Be.
Internet Links for Barylite-1O
mindat.org URL:
https://www.mindat.org/min-29078.html
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References for Barylite-1O
Localities for Barylite-1O
Showing 2 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Russia | |
| Pavel M. Kartashov (n.d.) |
| Chukanov et al. (in Russ.) |
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Hackman Valley, Yukspor Mountain, Murmansk Oblast, Russia