Monteregianite-(Y)
A valid IMA mineral species
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About Monteregianite-(Y)
View of the Poudrette quarry, 2005 September
Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
Formula:
(Na,K)6(Y,Ca)2Si16O38 · 10H2O
Colour:
Colorless, white, grey, rarely mauve or pale green
Lustre:
Vitreous, Silky
Hardness:
3½
Specific Gravity:
2.42
Crystal System:
Monoclinic
Member of:
Name:
Originally named monteregianite by George Y. Chao in 1978 after the Monteregian Hills, a series of monadnocks or prominent hills on an otherwise flat landscape in eastern Quebec, Canada. The type locality for the mineral, Poudrette Quarry, Mont Saint-Hilaire, is on one of these hills. The suffix/modifier follows the Levinson rule, indicating that the predominant essential REE is yttrium. It was added by the IMA in 1987.
Before being described, the mineral was referred to as UK-6 in Mont Saint-Hilaire related literature.
Before being described, the mineral was referred to as UK-6 in Mont Saint-Hilaire related literature.
Unique Identifiers
Mindat ID:
2765
Long-form identifier:
mindat:1:1:2765:2
GUID
(UUID V4):
(UUID V4):
b1f69663-ffc2-49d7-b917-7033a4367782
IMA Classification of Monteregianite-(Y)
Approved
IMA status notes:
Renamed by the IMA
IMA Formula:
KNa2YSi8O19 · 5H2O
First published:
1978
Classification of Monteregianite-(Y)
9.EB.15
9 : SILICATES (Germanates)
E : Phyllosilicates
B : Double nets with 4- and 6-membered rings
9 : SILICATES (Germanates)
E : Phyllosilicates
B : Double nets with 4- and 6-membered rings
72.5.1.2
72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
5 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with corrugated and complex layers
72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
5 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with corrugated and complex layers
14.8.7
14 : Silicates not Containing Aluminum
8 : Silicates of Group III metals other than Al
14 : Silicates not Containing Aluminum
8 : Silicates of Group III metals other than Al
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Mreg-Y | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Monteregianite-(Y)
Vitreous, Silky
Transparency:
Transparent, Translucent, Opaque
Colour:
Colorless, white, grey, rarely mauve or pale green
Streak:
White
Hardness:
3½ on Mohs scale
Cleavage:
Perfect
{010} perfect, {001} very good,{100} fair.
{010} perfect, {001} very good,{100} fair.
Density:
2.42 g/cm3 (Measured) 2.391 g/cm3 (Calculated)
Optical Data of Monteregianite-(Y)
Type:
Biaxial (+)
RI values:
nα = 1.510 nβ = 1.513 nγ = 1.517
Max Birefringence:
δ = 0.007
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
none
Optical Extinction:
X = c; Y = a; Z = b.
Chemistry of Monteregianite-(Y)
Mindat Formula:
(Na,K)6(Y,Ca)2Si16O38 · 10H2O
Crystallography of Monteregianite-(Y)
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 9.512(2) Å, b = 23.956(4) Å, c = 9.617(2) Å
β = 93.85(1)°
β = 93.85(1)°
Ratio:
a:b:c = 0.397 : 1 : 0.401
Unit Cell V:
2,186.48 Ă
Âł (Calculated from Unit Cell)
Z:
2
Morphology:
Bounded by {010}, {001} and {100}. Some also show {101}.
Comment:
Space group P21/n.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Big Balls | Small Balls | Just Balls | Spacefill
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Big Balls | Small Balls | Just Balls | Spacefill
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CIF File Best | x | y | z | a | b | c
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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) |
|---|---|---|---|---|---|---|---|
| 0001072 | Monteregianite-(Y) | Ghose S, Sen Gupta P K, Campana C F (1987) Symmetry and crystal structure of monteregianite, Na4K2Y2Si16O38.10H2O, a double-sheet silicate with zeolitic properties no longer have the original data, so they cannot check American Mineralogist 72 365-374 |  | 1987 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 12.00 Ă | (100) |
| 7.03 Ă | (100) |
| 6.55 Ă | (40) |
| 6.02 Ă | (50) |
| 4.42 Ă | (100) |
| 3.405 Ă | (50) |
| 3.026 Ă | (50) |
| 2.873 Ă | (80) |
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 Monteregianite-(Y)
General Appearance of Type Material:
Needle-shaped crystals in radiating clusters and as groups of tabular crystals.
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, Canada, 37130.
National Museum of Natural History, Washington, D.C., USA, 145548.
National Museum of Natural History, Washington, D.C., USA, 145548.
Geological Setting of Type Material:
Miarolitic cavities and thermally metamorphosed inclusions and rheomorphic breccias in nepheline syenite.
Associated Minerals at Type Locality:
Synonyms of Monteregianite-(Y)
Other Language Names for Monteregianite-(Y)
Russian:ĐĐŸĐœŃĐ”ŃĐ”ĐŽĐ¶ĐžĐ°ĐœĐžŃ-(Y)
Relationship of Monteregianite-(Y) to other Species
Member of:
Other Members of this group:
| Delhayelite | (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3 · 18H2O | Orth. |
| Fivegite | K4Ca2[AlSi7O17(O2-xOHx)][(H2O)2-xOHx]Cl | Orth. mm2 : Pmn21 |
| Hydrodelhayelite | KCa2AlSi7O17(OH)2 · 6H2O | Orth. mm2 |
| Melansonite | Naâ»KZrSi8O19 · 5H2O | Orth. mmm (2/m 2/m 2/m) : Pmma |
| Natromelansonite | Na3Zr[Si7AlO19] · 4H2O | Mon. 2/m : P21/m |
| Rhodesite | KHCa2Si8O19 · 5H2O | Orth. mmm (2/m 2/m 2/m) |
Forms a series with:
Common Associates
Associated Minerals Based on Photo Data:
| 26 photos of Monteregianite-(Y) associated with Calcite | CaCO3 |
| 15 photos of Monteregianite-(Y) associated with Albite | Na(AlSi3O8) |
| 13 photos of Monteregianite-(Y) associated with Quartz | SiO2 |
| 11 photos of Monteregianite-(Y) associated with Leucosphenite | BaNa4Ti2B2Si10O30 |
| 6 photos of Monteregianite-(Y) associated with Pectolite | NaCa2Si3O8(OH) |
| 3 photos of Monteregianite-(Y) associated with Vinogradovite | Na4Ti4(Si2O6)2[(Si,Al)4O10]O4 · (H2O,Na,K)3 |
| 2 photos of Monteregianite-(Y) associated with Fluorite | CaF2 |
| 2 photos of Monteregianite-(Y) associated with Narsarsukite | Na4(Ti,Fe)2[Si8O20](O,OH,F)2 |
| 2 photos of Monteregianite-(Y) associated with Chabazite-Na | (Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O |
| 2 photos of Monteregianite-(Y) associated with Microcline | K(AlSi3O8) |
Related Minerals - Strunz-mindat Grouping
| 9.EB. | Natromelansonite | Na3Zr[Si7AlO19] · 4H2O |
| 9.EB.05 | Macdonaldite | BaCa4Si16O36(OH)2 · 10H2O |
| 9.EB.05 | Rhodesite | KHCa2Si8O19 · 5H2O |
| 9.EB.05 | Melansonite | Naâ»KZrSi8O19 · 5H2O |
| 9.EB.10 | Delhayelite | (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3 · 18H2O |
| 9.EB.10 | Hydrodelhayelite | KCa2AlSi7O17(OH)2 · 6H2O |
| 9.EB.20 | Carletonite | KNa4Ca4Si8O18(CO3)4(OH,F) · H2O |
| 9.EB.20 | Fluorcarletonite | KNa4Ca4Si8O18(CO3)4F · H2O |
| 9.EB.25 | GĂŒnterblassite | (K,Ca,Ba)2(Fe,Ca,Mg,Na)[(Si,Al)13O25(OH)4] · 7H2O · |
| 9.EB.25 | Umbrianite | K7Na2Ca2[Al3Si10O29]F2Cl2 |
| 9.EB.25 | Hillesheimite | (K,Ca,Ba,â»)2(Mg,Fe,Ca,â»)2[(Si,Al )13O23(OH)6](OH) · 8H2O |
| 9.EB.30 | Fivegite | K4Ca2[AlSi7O17(O2-xOHx)][(H2O)2-xOHx]Cl |
Fluorescence of Monteregianite-(Y)
Fluoresces green under SW UV.
Other Information
IR Spectrum:
Infrared spectra confirm the presence of H2O in the mineral.
Thermal Behaviour:
Three distinct stages of dehydration at 25-80, 80-200, and 200-400 °C.
Notes:
Readily etched by 1:l HCl, HNO3, and H2SO4.
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 Monteregianite-(Y)
mindat.org URL:
https://www.mindat.org/min-2765.html
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Please feel free to link to this page.
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References for Monteregianite-(Y)
Reference List:
Chao, George Y. (1978) Monteregianite, a new hydrous sodium potassium yttrium silicate mineral from Mont St-Hilaire, Québec. The Canadian Mineralogist, 16 (4) 561-565
Localities for Monteregianite-(Y)
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - 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 (TL) | |
| Chao (1978) +2 other references |
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Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada