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Vegrandisite
A valid IMA mineral species
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Formula:
BaCl2
Colour:
clear
Specific Gravity:
3.856
Crystal System:
Orthorhombic
Name:
The name of the mineral was derived from Latin vegrandis for small or tiny. It is the opposite of grandis – large.
Known synthetic analogue - α-BaCl2 that exhibits a PbCl2-type (cotunnite) structure.
Combined Raman spectroscopy and transmission electron microscopy (TEM) were used to confirm the identity of natural material in the type locality, most of the properties were measured on synthetic material.
Králíkite is a hydrated analogue.
Combined Raman spectroscopy and transmission electron microscopy (TEM) were used to confirm the identity of natural material in the type locality, most of the properties were measured on synthetic material.
Králíkite is a hydrated analogue.
Unique Identifiers
Mindat ID:
471233
Long-form identifier:
mindat:1:1:471233:2
IMA Classification of Vegrandisite
Approved
Classification of Vegrandisite
3.DC.25
3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
C : With Pb (As,Sb,Bi), without Cu
3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
C : With Pb (As,Sb,Bi), without Cu
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Veg | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Vegrandisite
Transparency:
Transparent
Colour:
Clear
Tenacity:
Brittle
Density:
3.856 g/cm3 (Measured) 3.92 g/cm3 (Calculated)
Optical Data of Vegrandisite
Type:
Biaxial (+)
RI values:
nα = 1.73024(15) nβ = 1.73611(15) nγ = 1.74196(15)
2V:
Measured: 90°
Max. Birefringence:
δ = 0.012
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Pleochroism:
Non-pleochroic
Comments:
on synthetic material
Chemistry of Vegrandisite
Mindat Formula:
BaCl2
Elements listed:
Common Impurities:
Sr,Br
Crystallography of Vegrandisite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Pnma
Setting:
Pnma
Cell Parameters:
a = 7.80(3) Å, b = 4.71(2) Å, c = 9.60(9) Å
Ratio:
a:b:c = 1.656 : 1 : 2.038
Unit Cell V:
352.68 ų (Calculated from Unit Cell)
Z:
4
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.041 Å | (55) |
| 3.933 Å | (60) |
| 2.880 Å | (66) |
| 2.616 Å | (67) |
| 2.366 Å | (100) |
| 2.355 Å | (86) |
| 2.021 Å | (55) |
| 1.966 Å | (60) |
Type Occurrence of Vegrandisite
General Appearance of Type Material:
small anhedral and transparent crystals up to 4 μm long
Place of Conservation of Type Material:
Type material is deposited in the collections of the Mineralogical Museum, Comenius University, Ilkovičova 6, Bratislava 842 15, Slovakia, catalogue number 7400
Geological Setting of Type Material:
occurs as a minor phase in salt melt inclusions hosted by vein
quartz, The nearly water-free salt melt evolved from a hypersaline liquid, accompanied by magmatic vapor, that were exsolved from a dioritic magma emplaced at shallow subvolcanic depth.
quartz, The nearly water-free salt melt evolved from a hypersaline liquid, accompanied by magmatic vapor, that were exsolved from a dioritic magma emplaced at shallow subvolcanic depth.
Associated Minerals at Type Locality:
Other Language Names for Vegrandisite
Dutch:Vegrandisiet
German:Vegrandisit
Related Minerals - Strunz-mindat Grouping
| 3.DC. | Gajardoite | KCa0.5As3+4O6Cl2 · 5H2O |
| 3.DC. | Lucabindiite | (K,NH4)As4O6(Cl,Br) |
| 3.DC. | Dmitrievite | Sb4Cl2O5 |
| 3.DC. | Cuatrocapaite-(NH4) | (NH4)3(NaMg◻)(As2O3)6Cl6 · 16H2O |
| 3.DC. | Cuatrocapaite-(K) | K3(NaMg◻)(As2O3)6Cl6 · 16H2O |
| 3.DC. | Napoliite | Pb2OFCl |
| 3.DC. | Torrecillasite | Na(As,Sb)3+4O6Cl |
| 3.DC.05 | Paralaurionite | PbCl(OH) |
| 3.DC.05 | Laurionite | PbCl(OH) |
| 3.DC.05 | Mauriziodiniite | (NH4)(As2O3)2I |
| 3.DC.05 | Russoite | (NH4)ClAs2O3(H2O)0.5 |
| 3.DC.10 | Fiedlerite | Pb3FCl4(OH) · H2O |
| 3.DC.15 | Penfieldite | Pb2Cl3(OH) |
| 3.DC.15 | Telluroperite | Pb3TeO4Cl2 |
| 3.DC.20 | Laurelite | Pb7F12Cl2 |
| 3.DC.25 | Zhangpeishanite | BaFCl |
| 3.DC.25 | Matlockite | PbFCl |
| 3.DC.25 | Zavaritskite | (BiO)F |
| 3.DC.25 | Rorisite | CaFCl |
| 3.DC.25 | Bismoclite | BiOCl |
| 3.DC.30 | Nadorite | PbSbClO2 |
| 3.DC.30 | Perite | PbBiClO2 |
| 3.DC.40 | Thorikosite | Pb3Cl2(OH)(SbO3,AsO3) |
| 3.DC.45 | Mereheadite | Pb47Cl25(OH)13O24(CO3)(BO3)2 |
| 3.DC.50 | Blixite | Pb8O5(OH)2Cl4 |
| 3.DC.52 | Rumseyite | Pb2OClF |
| 3.DC.55 | Vladkrivovichevite | [Pb32O18][Pb4Mn2O]Cl14(BO3)8 · 2H2O |
| 3.DC.55 | Pinalite | Pb3WO5Cl2 |
| 3.DC.57 | Yeomanite | Pb2O(OH)Cl |
| 3.DC.60 | Symesite | Pb10(SO4)O7Cl4 · H2O |
| 3.DC.60 | 'Lorettoite' | Pb7O6Cl2 |
| 3.DC.62 | 'Sarawakite (of Frenzel)' | Sb, O, Cl (?) |
| 3.DC.65 | Ecdemite | Pb6As3+2O7Cl4 |
| 3.DC.70 | Mendipite | Pb3Cl2O2 |
| 3.DC.75 | Damaraite | Pb3Cl(OH)O2 |
| 3.DC.80 | Onoratoite | Sb8Cl2O11 |
| 3.DC.95 | Barstowite | Pb4Cl6(CO3) · H2O |
Fluorescence of Vegrandisite
In UV light (254/365 nm), BaCl2 powder shows weak yellow luminescence
Other Information
Notes:
very hygroscopic and transform rapidly at room temperature to BaCl2 ⋅2H2 O, but loses one-half of its crystal H2 O if heated above 55 °C. By further heating, it returns to anhydrous BaCl2 at 121 °C
Synthetic BaCl2 is soluble in water, insoluble in acetone, ethanol and ether, slightly soluble in acetic acid and sulfuric acid.
Synthetic BaCl2 is soluble in water, insoluble in acetone, ethanol and ether, slightly soluble in acetic acid and sulfuric acid.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Vegrandisite
mindat.org URL:
https://www.mindat.org/min-471233.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Vegrandisite
Reference List:
Localities for Vegrandisite
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.
Canada | |
| Kodera et al. (2025) |
Slovakia (TL) | |
| Koděra |
