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Calcioveatchite
A valid IMA mineral species
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About Calcioveatchite
Formula:
SrCaB11O16(OH)5 · 5H2O
Colour:
colourless
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
2.58
Crystal System:
Monoclinic
Name:
Named for its relationship with veatchite, with calcium substituting for half of the strontium. The veatchite root name is for John Allen Veatch (5 March 1808, Knox County, Kentucky, USA - 24 April 1870, Portland, Texas, USA), surgeon, surveyor, and scientist. He was the first person to detect boron in the mineral waters of California in 1856.
The SrCa-ordered analogue of veatchite. Chemically similar to kurgantaite and strontioginorite. Also compare 'strontiohilgardite'.
(calcioveatchite-1M)
A continuous, almost complete isomorphous series which extends from Ca-free veatchite, Sr2B11O16(OH)5·H2O, to calcioveatchite with the composition Sr1.14Ca0.87B10.99O16(OH)5·H2O.
The type material of calcioveatchite originates from drillcore of a prospecting borehole no. 130 (depth 911 m) drilled at the Nepskoe potassium salt deposit, Irkutsk Oblast, Siberia, Russia.
(calcioveatchite-1M)
A continuous, almost complete isomorphous series which extends from Ca-free veatchite, Sr2B11O16(OH)5·H2O, to calcioveatchite with the composition Sr1.14Ca0.87B10.99O16(OH)5·H2O.
The type material of calcioveatchite originates from drillcore of a prospecting borehole no. 130 (depth 911 m) drilled at the Nepskoe potassium salt deposit, Irkutsk Oblast, Siberia, Russia.
Unique Identifiers
Mindat ID:
55030
Long-form identifier:
mindat:1:1:55030:7
IMA Classification of Calcioveatchite
Approved
IMA Formula:
SrCaB11O16(OH)5·H2O
Approval year:
2020
Type description reference:
Classification of Calcioveatchite
6.EC.
6 : BORATES
E : Pentaborates
C : Phyllo-pentaborates
6 : BORATES
E : Pentaborates
C : Phyllo-pentaborates
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 |
|---|---|---|
| Cvea | 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 Calcioveatchite
Vitreous
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Hardness:
2 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
on {010}
on {010}
Fracture:
Step-Like
Density:
2.58(1) g/cm3 (Measured) 2.567 g/cm3 (Calculated)
Optical Data of Calcioveatchite
Type:
Biaxial (+)
RI values:
nα = 1.543(2) nβ = 1.550(5) nγ = 1.626(2)
2V:
Measured: 30° (10), Calculated: 35°
Max. Birefringence:
δ = 0.083
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:
Moderate (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
Chemistry of Calcioveatchite
Mindat Formula:
SrCaB11O16(OH)5 · 5H2O
Element Weights:
Crystallography of Calcioveatchite
Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P21
Setting:
P21
Cell Parameters:
a = 6.7030(3) Å, b = 20.6438(9) Å, c = 6.6056(3) Å
β = 119.153(7)°
β = 119.153(7)°
Ratio:
a:b:c = 0.325 : 1 : 0.32
Unit Cell V:
798.26 ų (Calculated from Unit Cell)
Z:
2
Twinning:
Simple twins with contact face {010}
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.35 Å | (100) |
| 5.633 Å | (12) |
| 5.092 Å | (10) |
| 3.447 Å | (14) |
| 3.362 Å | (13) |
| 3.309 Å | (38) |
| 2.862 Å | (10) |
| 2.585 Å | (19) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 25 : Evaporites (prebiotic) |
Type Occurrence of Calcioveatchite
General Appearance of Type Material:
prismatic or tabular crystals up to 1 × 1.5 × 3 mm3 and crystal clusters up to 3 mm
Place of Conservation of Type Material:
collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, registration number 5482/1
Geological Setting of Type Material:
Evaporite salt deposit
Associated Minerals at Type Locality:
Synonyms of Calcioveatchite
Other Language Names for Calcioveatchite
Dutch:Calcioveatchiet
German:Calcioveatchit
Related Minerals - Strunz-mindat Grouping
| 6.EC.05 | Nasinite | Na2[B5O8(OH)] · 2H2O |
| 6.EC.05 | Biringuccite | Na2B5O8(OH) · H2O |
| 6.EC.10 | Gowerite | Ca[B5O8(OH)][B(OH)3] · 3H2O |
| 6.EC.15 | 'Veatchite-2M' | Sr2B11O16(OH)5 · H2O |
| 6.EC.15 | 'Veatchite-A' | Sr2B11O16(OH)5 · H2O |
| 6.EC.15 | Veatchite | Sr2B11O16(OH)5 · H2O |
| 6.EC.15 | 'Veatchite-1M' | Sr2B11O16(OH)5 · H2O |
| 6.EC.20 | Volkovskite | KCa4[B5O8OH]4[B(OH)3]2Cl · 4H2O |
| 6.EC.25 | Tuzlaite | NaCaB5O8(OH)2 · 3H2O |
| 6.EC.30 | Heidornite | Na2Ca3B5O8(SO4)2Cl(OH)2 |
| 6.EC.35 | Popugaevaite | Ca3[B5O6(OH)6]FCl2 · 8H2O |
| 6.EC.35 | Brianroulstonite | Ca3[B5O6(OH)6](OH)Cl2 · 8H2O |
Fluorescence of Calcioveatchite
non-fluorescent under both ultraviolet rays and an electron beam
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.
Internet Links for Calcioveatchite
mindat.org URL:
https://www.mindat.org/min-55030.html
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Please feel free to link to this page.
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References for Calcioveatchite
Localities for Calcioveatchite
Showing 1 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 (TL) | |
| doi.org (n.d.) +2 other references |
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Nepskoe K salt deposit, Nepa River basin, Lower Tunguska, Irkutsk Oblast, Russia