Calciohilairite
A valid IMA mineral species
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About Calciohilairite
Formula:
CaZr[SiO3]3 · 3H2O
Colour:
White to pale blue
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
2.68
Crystal System:
Trigonal
Member of:
Name:
For its chemical composition and relationship to hilairite
Unique Identifiers
Mindat ID:
831
Long-form identifier:
mindat:1:1:831:8
IMA Classification of Calciohilairite
Approved
IMA Formula:
CaZr4+Si3O9·3H2O
Approval year:
1984
First published:
1988
Classification of Calciohilairite
9.DM.10
9 : SILICATES (Germanates)
D : Inosilicates
M : Inosilicates with 6-periodic single chains
9 : SILICATES (Germanates)
D : Inosilicates
M : Inosilicates with 6-periodic single chains
59.2.3.2
59 : CYCLOSILICATES Three-Membered Rings
2 : Three-Membered Rings, hydrated
59 : CYCLOSILICATES Three-Membered Rings
2 : Three-Membered Rings, hydrated
14.10.21
14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf
14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf
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 |
|---|---|---|
| Chlr | 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 Calciohilairite
Vitreous
Transparency:
Translucent
Colour:
White to pale blue
Hardness:
4 on Mohs scale
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
2.68(2) g/cm3 (Measured)
Comment:
Floatation
Optical Data of Calciohilairite
Type:
Uniaxial (-)
RI values:
nω = 1.622(1) nε = 1.619(1)
Max. Birefringence:
δ = 0.003
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:
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 uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Chemistry of Calciohilairite
Mindat Formula:
CaZr[SiO3]3 · 3H2O
Element Weights:
Common Impurities:
Na,Cu,Al,Fe,Ti
Crystallography of Calciohilairite
Crystal System:
Trigonal
Class (H-M):
32 - Trapezohedral
Space Group:
R32
Cell Parameters:
a = 20.870(4) Å, c = 16.002(4) Å
Ratio:
a:c = 1 : 0.767
Unit Cell V:
6,036.01 ų (Calculated from Unit Cell)
Z:
24
Morphology:
Two trigonal prisms {11-20}, {2-1-10} and two rhombohedrons {10-12} and {00-12}.
Twinning:
None observed
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Polyhedra Off | Si Polyhedra | All Polyhedra
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2D | Stereo | Red-Blue | Red-Cyan
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View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
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Labels
Console Off | On | Grey | Yellow
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0012381 | Calciohilairite | Pushcharovsky D Y, Pekov I V, Pasero M, Gobechiya E R, Merlino S, Zubkova N V (2002) Crystal structure of cation-deficient calciohilairite and possible mechanisms of decationization in mixed-framework minerals Crystallography Reports 47 748-752 | 2002 | Lovozero massif, Kola Peninsula, Russia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.231 Å | (100) |
| 3.013 Å | (30) |
| 3.137 Å | (20) |
| 5.993 Å | (12) |
| 2.607 Å | (9) |
| 2.900 Å | (7) |
| 3.197 Å | (6) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Calciohilairite
General Appearance of Type Material:
White to pale blue unaltered and altered crystals, to 2 mm.
Place of Conservation of Type Material:
National Museum of Natural History, Smithsonian Institution, Washington, D.C. (NMNH no. 161901 and 162182).
Russell C. Boggs collection (no. T990 to T996).
Russell C. Boggs collection (no. T990 to T996).
Geological Setting of Type Material:
Miarolitic cavities in peralkaline granite.
Associated Minerals at Type Locality:
Synonyms of Calciohilairite
Other Language Names for Calciohilairite
Relationship of Calciohilairite to other Species
Member of:
Other Members of Hilairite Group:
| Hilairite | Na2Zr[SiO3]3 · 3H2O | Trig. 32 : R32 |
| Komkovite | BaZr[Si3O9] · 3H2O | Trig. 32 : R32 |
| Pyatenkoite-(Y) | Na5YTi[SiO3]6 · 6H2O | Trig. 32 : R32 |
| Sazykinaite-(Y) | Na5YZr[SiO3]6 · 6H2O | Trig. 32 : R32 |
Common Associates
Associations Based on Photo Data:
| 14 photos of Calciohilairite associated with Kuzmenkoite-Mn | K2Mn2+(Ti,Nb)4(Si4O12)2(OH,O)4 · 5-6H2O |
| 6 photos of Calciohilairite associated with Chamosite | Fe2+5Al(AlSi3O10)(OH)8 |
| 5 photos of Calciohilairite associated with Quartz | SiO2 |
| 4 photos of Calciohilairite associated with Microcline | K(AlSi3O8) |
| 3 photos of Calciohilairite associated with Albite | Na(AlSi3O8) |
| 2 photos of Calciohilairite associated with Aegirine | NaFe3+Si2O6 |
| 2 photos of Calciohilairite associated with Annite | KFe2+3(AlSi3O10)(OH)2 |
| 1 photo of Calciohilairite associated with Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| 1 photo of Calciohilairite associated with Labuntsovite-Mn | Na4K4(Ba,K)2Mn2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10-12H2O |
| 1 photo of Calciohilairite associated with Natrolite | Na2Al2Si3O10 · 2H2O |
Related Minerals - Strunz-mindat Grouping
| 9.DM. | Kesebolite-(Ce) | CeCa2Mn(AsO4)(SiO3)3 |
| 9.DM.05 | Stokesite | CaSn[Si3O9] · 2H2O |
| 9.DM.10 | Pyatenkoite-(Y) | Na5YTi[SiO3]6 · 6H2O |
| 9.DM.10 | Hilairite | Na2Zr[SiO3]3 · 3H2O |
| 9.DM.10 | Komkovite | BaZr[Si3O9] · 3H2O |
| 9.DM.10 | Sazykinaite-(Y) | Na5YZr[SiO3]6 · 6H2O |
| 9.DM.15 | Plumbogaidonnayite | PbZrSi3O9 · 2H2O |
| 9.DM.15 | Gaidonnayite | Na2Zr(Si3O9) · 2H2O |
| 9.DM.15 | Georgechaoite | NaKZr[Si3O9] · 2H2O |
| 9.DM.20 | Chkalovite | Na2BeSi2O6 |
| 9.DM.25 | Vlasovite | Na2ZrSi4O11 |
| 9.DM.30 | Revdite | Na16Si16O27(OH)26 · 28H2O |
| 9.DM.35 | Scheuchzerite | Na(Mn,Mg,Zn)9[VSi9O28(OH)](OH)3 |
| 9.DM.40 | Terskite | Na4ZrSi6O16 · 2H2O |
| 9.DM.40 | Hydroterskite | Na2ZrSi6O12(OH)6 |
Fluorescence of Calciohilairite
Not fluorescent
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 Calciohilairite
mindat.org URL:
https://www.mindat.org/min-831.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Calciohilairite
Reference List:
Boggs, Russell C. (1988) Calciohilairite: CaZrSi3O9·3H2O, the calcium analogue of hilairite from the Golden Horn batholith, northern Cascades, Washington. American Mineralogist, 73 (9-10) 1191-1194
Localities for Calciohilairite
Showing 14 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.
Brazil | |
| Silva Rosa et al. (2025) |
| Gomes et al. (2023) | |
Canada | |
| HORVÁTH et al. (2000) |
| Horváth et al. (1998) |
| Horváth et al. (1998) | |
| Miller (1990) +4 other references | |
Norway | |
| Larsen (2021) |
| Larsen (2015) |
Portugal | |
| Alves (n.d.) |
Russia | |
| Pekov (2003) |
| [AmMin 85:1562] +1 other reference | |
USA | |
| Robin D. Tibbit (deceased) |
| Markus B. Raschke et al. (2016) |
| Micro Probe Volume VI Number 8 +2 other references |
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Selsurt Mountain, Lovozersky District, Murmansk Oblast, Russia