Limousinite
A valid IMA mineral species
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About Limousinite
Formula:
BaCa[Be4P4O16] · 6H2O
Colour:
Colorless to snow-white
Lustre:
Vitreous
Specific Gravity:
2.58 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Named after the French historical region Limousin from which it was collected.
A beryllophosphate mineral structurally related to phillipsite. Unique combination of elements (2024). It is the third known natural zeolite-type beryllophosphate together with pahasapaite and wilancookite.
Chemically especially related to wilancookite and minjiangite (also beryllophosphates), and somewhat to babefphite. Also compare pahasapaite.
Chemically especially related to wilancookite and minjiangite (also beryllophosphates), and somewhat to babefphite. Also compare pahasapaite.
Unique Identifiers
Mindat ID:
53675
Long-form identifier:
mindat:1:1:53675:0
IMA Classification of Limousinite
Approved
IMA Formula:
BaCa[Be4P4O16]·6H2O
Approval year:
2019
First published:
2020
Type description reference:
Hatert, Frédéric, Dal Bo, Fabrice, Bruni, Yannick, Meisser, Nicolas, Vignola, Pietro, Risplendente, Andrea, Châtenet, François-Xavier, Lebocey, Julien (2020) Limousinite, BaCa[Be4P4O16]·6H2O, a new beryllophosphate mineral with a phillipsite-type framework. The Canadian Mineralogist, 58 (6) 815-827 doi:10.3749/canmin.2000007
Classification of Limousinite
8.CA.80
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations
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 |
|---|---|---|
| Lms | 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 Limousinite
Vitreous
Transparency:
Transparent
Colour:
Colorless to snow-white
Tenacity:
Brittle
Cleavage:
None Observed
Described as "without cleavage planes".
Described as "without cleavage planes".
Density:
2.58 g/cm3 (Calculated)
Comment:
Not measured due to the small size of crystals
Optical Data of Limousinite
Type:
Biaxial (-)
RI values:
nα = 1.532(2) nβ = 1.532(3) nγ = 1.558(2)
2V:
Calculated: 18°
Max. Birefringence:
δ = 0.026
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
Pleochroism:
Non-pleochroic
Comments:
non-dispersive
Chemistry of Limousinite
Mindat Formula:
BaCa[Be4P4O16] · 6H2O
Element Weights:
Crystallography of Limousinite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 9.4958(4) Å, b = 13.6758(4) Å, c = 13.4696(4) Å
β = 90.398(3)°
β = 90.398(3)°
Ratio:
a:b:c = 0.694 : 1 : 0.985
Unit Cell V:
1757 ų
Z:
4
Morphology:
Prismatic crystals up to 0.9 mm long with rhombic cross-sections.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.89 Å | (100) |
| 3.75 Å | (60) |
| 3.09 Å | (60) |
| 3.01 Å | (90) |
| 2.219 Å | (50) |
| 2.058 Å | (60) |
| 1.879 Å | (40) |
| 1.735 Å | (40) |
Reference:
Hatert, Frédéric, Dal Bo, Fabrice, Bruni, Yannick, Meisser, Nicolas, Vignola, Pietro, Risplendente, Andrea, Châtenet, François-Xavier, Lebocey, Julien (2020) Limousinite, BaCa[Be4P4O16]·6H2O, a new beryllophosphate mineral with a phillipsite-type framework. The Canadian Mineralogist, 58 (6) 815-827 doi:10.3749/canmin.2000007
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 22 : Hydration and low-? subsurface aqueous alteration (see also #23) |
Type Occurrence of Limousinite
General Appearance of Type Material:
Isolated, partly corroded, colorless to snow-white prismatic crystals up to 0.9 mm long with rhombic cross sections, in vug in altered primary Fe-Mn phosphates.
Place of Conservation of Type Material:
Mineralogical collections of (1) the Geological Museum of Lausanne, Switzerland, catalogue number MGL 093398, and (2) the Laboratory of Mineralogy, University of Liège, Belgium, catalogue number ULG 21167
Empirical Formula of Type Material:
(Ba0.91K0.07)Σ0.98(Ca0.87Na0.05)Σ0.92[(Be3.87Al0.13)Σ4P4O16] · 5.56H2O
Chemical Analysis of Type Material:
| P2O5 | 42.06 % |
|---|---|
| SiO2 | 0.02 % |
| Al2O3 | 0.99 % |
| MgO | 0.02 % |
| ZnO | 0.03 % |
| FeO | 0.02 % |
| CaO | 7.20 % |
| BaO | 20.60 % |
| SrO | 0.06 % |
| Na2O | 0.21 % |
| K2O | 0.47 % |
| BeO | 14.34 % |
| H2O | 14.83 % |
| Total: | 100.85 % |
Associated Minerals at Type Locality:
Reference:
Hatert, Frédéric, Dal Bo, Fabrice, Bruni, Yannick, Meisser, Nicolas, Vignola, Pietro, Risplendente, Andrea, Châtenet, François-Xavier, Lebocey, Julien (2020) Limousinite, BaCa[Be4P4O16]·6H2O, a new beryllophosphate mineral with a phillipsite-type framework. The Canadian Mineralogist, 58 (6) 815-827 doi:10.3749/canmin.2000007
Synonyms of Limousinite
Other Language Names for Limousinite
Dutch:Limousiniet
German:Limousinit
Relationship of Limousinite to other Species
Member of:
Other Members of Zeolite Group:
| Alflarsenite | NaCa2Be3Si4O13(OH) · 2H2O | Mon. 2 : P21 |
| Amicite | K2Na2Al4Si4O16 · 5H2O | Mon. 2 |
| Ammonioleucite | (NH4)(AlSi2O6) | Tet. 4/m : I41/a |
| Analcime | Na(AlSi2O6) · H2O | Tric. 1 : P1 |
| Arzamastsevite | K6Al5Si6O20(OH)4Cl | Tet. 42m : I42m |
| Bellbergite | (K,Ba,Sr)2Sr2Ca2(Ca,Na)4[Al3Si3O12]6 · 30H2O | Hex. |
| Bikitaite | LiAlSi2O6 · H2O | Tric. 1 : P1 |
| Boggsite | Ca8Na3(Si,Al)96O192 · 70H2O | Orth. mmm(2/m2/m2/m) : Imma |
| Brewsterite Subgroup | Zeolite Group. | |
| Chabazite-Levyne Subgroup | M[Al2Si4O12] · 6H2O | |
| Chiavennite | CaMnBe2Si5O13(OH)2 · 2H2O | Mon. 2/m : P21/b |
| Clinoptilolite Subgroup | (Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O | |
| Cowlesite | CaAl2Si3O10 · 6H2O | Orth. mmm(2/m2/m2/m) |
| Dachiardite Subgroup | Zeolite Group. | |
| Direnzoite | NaK6MgCa2(Al13Si47O120) · 36H2O | Orth. mmm(2/m2/m2/m) : Pmmn |
| Edingtonite | Ba[Al2Si3O10] · 4H2O | Orth. 222 : P212121 |
| Epistilbite | CaAl2Si6O16 · 5H2O | Mon. |
| Erionite Subgroup | M2[Al4Si14O36] · 15H2O | |
| Fabrièsite | Na3Al3Si3O12 · 2H2O | Orth. mm2 : Pmm2 |
| Faujasite Subgroup | M3.5[Al7Si17O48] · 32H2O | |
| Ferrierite Subgroup | Name used for unanalysed specimens that could be either ferrierite-K, ferrierite-Mg, ... | |
| Ferrochiavennite | Ca1-2Fe[(Si,Al,Be)5Be2O13(OH)2] · 2H2O | Mon. 2/m : P21/b |
| Flörkeite | (K3Ca2Na)[Al8Si8O32] · 12H2O | Tric. 1 : P1 |
| Garronite Subgroup | ||
| Gaultite | Na4Zn2Si7O18 · 5H2O | Orth. mm2 : Fdd2 |
| Gismondine Subgroup | Zeolite Group. | |
| Gmelinite Subgroup | In 1997, gmelinite was split into Gmelinite-Ca, Gmelinite-Na and Gmelinite-K. | |
| Gobbinsite | Na5(Si11Al5)O32 · 11H2O | Orth. mmm(2/m2/m2/m) : Pnma |
| Goosecreekite | Ca[Al2Si6O16] · 5H2O | Mon. 2 : P21 |
| Gottardiite | Na3Mg3Ca5Al19Si117O272 · 93H2O | Orth. mmm(2/m2/m2/m) : Cmca |
| Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O | |
| Hsianghualite | Ca3Li2(Be3Si3O12)F2 | Iso. 23 : I213 |
| Kalborsite | K6Al4BSi6O20(OH)4Cl | Tet. 42m : P421c |
| Kirchhoffite | Cs(BSi2O6) | Tet. 4/mmm(4/m2/m2/m) : I41/acd |
| Laumontite | CaAl2Si4O12 · 4H2O | Mon. 2/m : B2/m |
| Leucite | K(AlSi2O6) | Tet. 4/m : I41/a |
| Lithosite | K6Al4Si8O25 · 2H2O | Mon. |
| Loomisite | Ba[Be2P2O8] · H2O | Mon. m |
| Lovdarite | K2Na6Be4Si14O36 · 9H2O | Orth. mm2 |
| Maricopaite | Pb7Ca2(Si,Al)48O100 · 32H2O | Orth. |
| Martinandresite | Ba2(Al4Si12O32) · 10H2O | Orth. mmm(2/m2/m2/m) : Pmmn |
| Mazzite Subgroup | Zeolite Group. | |
| Meierite | Ba44Si66Al30O192Cl25(OH)33 | Iso. m3m(4/m32/m) : Im3m |
| Merlinoite | K5Ca2(Si23Al9)O64 · 24H2O | Orth. mmm(2/m2/m2/m) : Immm |
| Montesommaite | (K,Na)9Al9Si23O64 · 10H2O | Orth. mm2 : Fdd2 |
| Mordenite | (Na2,Ca,K2)4(Al8Si40)O96 · 28H2O | Orth. |
| Mountainite | KNa2Ca2[Si8O19(OH)] · 6H2O | Mon. 2/m : P2/b |
| Mutinaite | Na3Ca4Si85Al11O192 · 60H2O | Orth. mmm(2/m2/m2/m) : Pnma |
| Nabesite | Na2BeSi4O10 · 4H2O | Orth. 222 : P212121 |
| Natrolite Subgroup | A subgroup of the Zeolite Group. | |
| Offretite | KCaMg(Si13Al5)O36 · 15H2O | Hex. 6m2 : P6m2 |
| Pahasapaite | Li8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O | Iso. 23 : I23 |
| Parthéite | Ca2(Si4Al4) O15 (OH)2 · 4H2O | Mon. 2/m : B2/b |
| Paulingite Subgroup | Paulingite was originally described in 1960. | |
| Perlialite | K9Na(Ca,Sr)[Al2Si4O12]6 · 15H2O | Hex. 6/mmm(6/m2/m2/m) : P6/mmm |
| Phillipsite Subgroup | (Ca0.5,K,Na,Ba0.5)4-7[Al4-7Si12-9O32] . 12H2O | |
| Pollucite | (Cs,Na)2(Al2Si4O12) · 2H2O | Iso. m3m(4/m32/m) : Ia3d |
| Roggianite | Ca2Be(OH)2Al2Si4O13 · 2.5H2O | Tet. 4/mmm(4/m2/m2/m) : I4/mcm |
| Rongibbsite | Pb2(Si4Al)O11(OH) | Mon. 2/m : B2/m |
| Stilbite Subgroup | M6-7[Al8-9Si27-28O72] · nH2O | |
| Terranovaite | (Na,Ca)8(Si68Al12)O160 · 29H2O | Orth. |
| Thomsonite Subgroup | The large majority of "thomsonite" is thomsonite-Ca. | |
| Thornasite | Na12Th4+3(Si8O19)4 · 18H2O | Trig. 3m : R3m |
| Tschernichite | (Ca,Na2)[Al2Si4O12] · 4-8H2O | Tet. 4/mmm(4/m2/m2/m) : P4/mmm |
| Tschörtnerite | Ca4(Ca,Sr,K,Ba)3Cu3[Al3Si3O12]4(OH)8 · nH2O | Iso. m3m(4/m32/m) : Fm3m |
| 'UM1996-38-SiO:AlCaHNa' | Na-Ca-Al-Si-O-H | |
| 'UM1999-33-SiO:AlHKNa' | K7Na5Al12Si20O64 · 24H2O | |
| 'UM2002-40-SiO:AlCaHKMgNa' | (Mg,Ca,Na,K)7.5(Al12.8Si51.2)O128 · 65H2O | Tet. 422 : P4122 |
| 'Unnamed (Ca analogue of Merlinoite)' | (Ca,K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2O ? | |
| Wairakite | Ca(Al2Si4O12) · 2H2O | Mon. 2/m : B2/m |
| Weinebeneite | CaBe3(PO4)2(OH)2 · 4H2O | Mon. m : Bb |
| Wenkite | (Ba,K)4(Ca,Na)6[(Si,Al)20O39(OH)2](SO4)3 · 0.5H2O | Hex. 6m2 : P62m |
| Wilancookite | (Ba5Li2◻)Ba6Be24P24O96 · 26H2O | Iso. 23 : I23 |
| Willhendersonite | KCa[Al3Si3O12] · 5H2O | Tric. 1 : P1 |
| Yugawaralite | CaAl2Si6O16 · 4H2O | Mon. m : Pb |
Common Associates
Associations Based on Photo Data:
| 3 photos of Limousinite associated with Whitmoreite | Fe2+Fe3+2(PO4)2(OH)2 · 4H2O |
| 2 photos of Limousinite associated with Nsutite | (Mn4+,Mn2+)(O,OH)2 |
| 1 photo of Limousinite associated with Greifensteinite | Ca2Fe2+5Be4(PO4)6(OH)4 · 6H2O |
Related Minerals - Strunz-mindat Grouping
| 8.CA. | Apexite | NaMg(PO4) · 9H2O |
| 8.CA. | Brandãoite | BeAl2(PO4)2(OH)2(H2O)5 |
| 8.CA. | Davidlloydite | Zn3(AsO4)2 · 4H2O |
| 8.CA.05 | Parafransoletite | Ca3Be2(PO4)2(PO3OH)2 · 4H2O |
| 8.CA.05 | Fransoletite | Ca3Be2(PO4)2(PO3OH)2 · 4H2O |
| 8.CA.10 | Ehrleite | Ca4Be3Zn2(PO4)6 · 9H2O |
| 8.CA.15 | Faheyite | Be2Mn2+Fe3+2(PO4)4 · 6H2O |
| 8.CA.20 | Mccrillisite | NaCs(Be,Li)Zr2(PO4)4 · 1-2H2O |
| 8.CA.20 | Gainesite | Na(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2O |
| 8.CA.20 | Selwynite | NaK(Be,Al)Zr2(PO4)4 · 2H2O |
| 8.CA.25 | Pahasapaite | Li8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O |
| 8.CA.30 | Nizamoffite | Mn2+Zn2(PO4)2(H2O)4 |
| 8.CA.30 | Arsenohopeite | Zn3(AsO4)2 · 4H2O |
| 8.CA.30 | Hopeite | ZnZn2(PO4)2 · 4H2O |
| 8.CA.35 | Warikahnite | Zn3(AsO4)2 · 2H2O |
| 8.CA.40 | Phosphophyllite | Zn2Fe 2+(PO4)2 · 4H2O |
| 8.CA.42 | Steinmetzite | Zn2Fe3+(PO4)2(OH) · 3H2O |
| 8.CA.45 | Parascholzite | CaZn2(PO4)2 · 2H2O |
| 8.CA.45 | Scholzite | CaZn2(PO4)2 · 2H2O |
| 8.CA.50 | Keyite | Cu2+3Zn4Cd2(AsO4)6 · 2H2O |
| 8.CA.55 | Pushcharovskite | K0.6Cu18[AsO2(OH)2]4[AsO3OH]10(AsO4)(OH)9.6 · 18.6H2O |
| 8.CA.60 | Prosperite | Ca2Zn4(AsO4)4 · H2O |
| 8.CA.65 | Gengenbachite | KFe3+3(PO3OH)4[PO2(OH)2]2 · 6H2O |
| 8.CA.70 | Parahopeite | Zn3(PO4)2 · 4H2O |
| 8.CA.70 | Reaphookhillite | MgZn2(PO4)2 · 4H2O |
| 8.CA.75 | Stergiouite | CaZn2(AsO4)2 · 4H2O |
| 8.CA.85 | Minjiangite | BaBe2(PO4)2 |
| 8.CA.85 | Wilancookite | (Ba5Li2◻)Ba6Be24P24O96 · 26H2O |
Fluorescence of Limousinite
Non-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 Limousinite
mindat.org URL:
https://www.mindat.org/min-53675.html
Please feel free to link to this page.
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References for Limousinite
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2019) CNMNC Newsletter No 50, New minerals and nomenclature modifications approved in 2019. Mineralogical Magazine, 83 (4) 615-620 doi:10.1180/mgm.2019.46
Hatert, Frédéric, Dal Bo, Fabrice, Bruni, Yannick, Meisser, Nicolas, Vignola, Pietro, Risplendente, Andrea, Châtenet, François-Xavier, Lebocey, Julien (2020) Limousinite, BaCa[Be4P4O16]·6H2O, a new beryllophosphate mineral with a phillipsite-type framework. The Canadian Mineralogist, 58 (6) 815-827 doi:10.3749/canmin.2000007
Localities for Limousinite
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.
France (TL) | |
| Miyawaki et al. (2019) +1 other reference |
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Vilatte-Haute Quarry, Vilatte Quarries, Chanteloube, Razès, Bellac, Haute-Vienne, Nouvelle-Aquitaine, France