Yugawaralite
A valid IMA mineral species - grandfathered
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About Yugawaralite

Fudo Waterfall - Type Locality of Yugawaralite
Yugawara Hot Spring, Yugawara, Ashigarashimo District, Kanagawa Prefecture, Japan
Yugawara Hot Spring, Yugawara, Ashigarashimo District, Kanagawa Prefecture, Japan
Formula:
CaAl2Si6O16 · 4H2O
Colour:
Colourless, white, pinkish
Lustre:
Vitreous, Pearly
Hardness:
4½ - 5
Specific Gravity:
2.20 - 2.23
Crystal System:
Monoclinic
Member of:
Name:
Named after its discovery locality, Yugawara Hot Spring, Kanagawa Prefecture, Japan.
Unique Identifiers
Mindat ID:
4376
Long-form identifier:
mindat:1:1:4376:8
IMA Classification of Yugawaralite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Ca(Si6Al2)O16·4H2O
First published:
1952
Classification of Yugawaralite
9.GB.15
9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
B : Chains of single connected 4-membered rings
9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
B : Chains of single connected 4-membered rings
Dana 7th ed.:
77.1.7.2
77.1.7.2
77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
16.9.24
16 : Silicates Containing Aluminum and other Metals
9 : Aluminosilicates of Ca
16 : Silicates Containing Aluminum and other Metals
9 : Aluminosilicates of Ca
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Yug | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Yug | Whitney & Evans (2010) | Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371 |
Physical Properties of Yugawaralite
Vitreous, Pearly
Transparency:
Transparent, Translucent
Comment:
iridescent on {010}.
Colour:
Colourless, white, pinkish
Streak:
White
Hardness:
4½ - 5 on Mohs scale
Tenacity:
Very brittle
Cleavage:
Poor/Indistinct
{401}, {100} distinct, {101} imperfect
{401}, {100} distinct, {101} imperfect
Parting:
{010}
Fracture:
Conchoidal
Density:
2.20 - 2.23 g/cm3 (Measured) 2.26 g/cm3 (Calculated)
Optical Data of Yugawaralite
Type:
Biaxial (+/-)
RI values:
nα = 1.492 - 1.496 nβ = 1.497 - 1.499 nγ = 1.502 - 1.504
2V:
Measured: 48° to 89°, Calculated: 58°
Max. Birefringence:
δ = 0.008 - 0.010
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 (negative)
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.
Dispersion:
weak
Chemistry of Yugawaralite
Mindat Formula:
CaAl2Si6O16 · 4H2O
Element Weights:
Common Impurities:
Fe,Mg,Na,K
Crystallography of Yugawaralite
Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Pb
Setting:
Pc
Cell Parameters:
a = 6.72(2) Å, b = 13.98(2) Å, c = 10.05(2) Å
β = 111.52°
β = 111.52°
Ratio:
a:b:c = 0.481 : 1 : 0.719
Unit Cell V:
878.34 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals flat tabular parallel to {010}. Showing (100), (010), (001), (110), (120), (011) and (111).
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0010958 | Yugawaralite | Kvick A, Artioli G, Smith J V (1986) Neutron diffraction study of the zeolite yugawaralite at 13 K Zeitschrift fur Kristallographie 174 265-281 | ![]() | 1986 | Hvalfjordur, Iceland | 0 | 293 |
| 0002627 | Yugawaralite | Artioli G, Stahl K, Cruciani G, Gualtieri A, Hanson J C (2001) In situ dehydration of yugawaralite American Mineralogist 86 185-192 | ![]() | 2001 | 0 | 315 | |
| 0002628 | Yugawaralite | Artioli G, Stahl K, Cruciani G, Gualtieri A, Hanson J C (2001) In situ dehydration of yugawaralite American Mineralogist 86 185-192 | ![]() | 2001 | 0 | 454 | |
| 0002629 | Yugawaralite | Artioli G, Stahl K, Cruciani G, Gualtieri A, Hanson J C (2001) In situ dehydration of yugawaralite American Mineralogist 86 185-192 | ![]() | 2001 | 0 | 581 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Loading XRD data...
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.057 Å | (100) |
| 4.672 Å | (70) |
| 4.652 Å | (67) |
| 5.81 Å | (52) |
| 7.01 Å | (31) |
| 3.237 Å | (29) |
| 4.295 Å | (26) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3a: Earth’s earliest Hadean crust | >4.50 |
| 9 : Lava/xenolith minerals (hornfels, sanidinite facies) | |
| 10 : Basalt-hosted zeolite minerals | |
| Stage 3b: Earth’s earliest hydrosphere | >4.45 |
| 14 : Hot springs, geysers, and other subaerial geothermal minerals | |
| 16 : Low-? aqueous alteration of Hadean subaerial lithologies (see also #23) |
Type Occurrence of Yugawaralite
General Appearance of Type Material:
A network of veins with well devloped crystals.
Place of Conservation of Type Material:
National Science Museum, Tokyo, Japan.
National School of Mines, Paris, France.
National Museum of Natural History, Washington, D.C., USA, 106164, 106931.
National School of Mines, Paris, France.
National Museum of Natural History, Washington, D.C., USA, 106164, 106931.
Geological Setting of Type Material:
Andesite tuff metamorphosed by hot spring action.
Associated Minerals at Type Locality:
Other Language Names for Yugawaralite
Dutch:Yugawaraliet
German:Yugawaralith
Yugawaralit
Yugawaralit
Japanese:湯河原沸石
Russian:Югаваралит
Spanish:Yugawaralita
Relationship of Yugawaralite 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 |
| Limousinite | BaCa[Be4P4O16] · 6H2O | Mon. 2/m : P21/b |
| 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 |
Common Associates
Associations Based on Photo Data:
| 39 photos of Yugawaralite associated with Quartz | SiO2 |
| 16 photos of Yugawaralite associated with Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
| 10 photos of Yugawaralite associated with Calcite | CaCO3 |
| 6 photos of Yugawaralite associated with Stilbite Subgroup | M6-7[Al8-9Si27-28O72] · nH2O |
| 6 photos of Yugawaralite associated with Laumontite | CaAl2Si4O12 · 4H2O |
| 3 photos of Yugawaralite associated with Gyrolite | NaCa16Si23AlO60(OH)8 · 14H2O |
| 3 photos of Yugawaralite associated with Mordenite | (Na2,Ca,K2)4(Al8Si40)O96 · 28H2O |
| 3 photos of Yugawaralite associated with Mesolite | Na2Ca2Si9Al6O30 · 8H2O |
| 2 photos of Yugawaralite associated with 'Basalt' | |
| 2 photos of Yugawaralite associated with Epistilbite | CaAl2Si6O16 · 5H2O |
Related Minerals - Strunz-mindat Grouping
| 9.GB.05 | Fabrièsite | Na3Al3Si3O12 · 2H2O |
| 9.GB.05 | Lithosite | K6Al4Si8O25 · 2H2O |
| 9.GB.05 | Wairakite | Ca(Al2Si4O12) · 2H2O |
| 9.GB.05 | Kirchhoffite | Cs(BSi2O6) |
| 9.GB.05 | Hsianghualite | Ca3Li2(Be3Si3O12)F2 |
| 9.GB.05 | Leucite | K(AlSi2O6) |
| 9.GB.05 | Pollucite | (Cs,Na)2(Al2Si4O12) · 2H2O |
| 9.GB.05 | Ammonioleucite | (NH4)(AlSi2O6) |
| 9.GB.05 | Analcime | Na(AlSi2O6) · H2O |
| 9.GB.10 | Laumontite | CaAl2Si4O12 · 4H2O |
| 9.GB.20 | Roggianite | Ca2Be(OH)2Al2Si4O13 · 2.5H2O |
| 9.GB.25 | Goosecreekite | Ca[Al2Si6O16] · 5H2O |
| 9.GB.30 | Montesommaite | (K,Na)9Al9Si23O64 · 10H2O |
| 9.GB.35 | Parthéite | Ca2(Si4Al4) O15 (OH)2 · 4H2O |
Other Information
Electrical:
Piezoelectric and pyroelectric
Notes:
Not attacked by hot or cold hydrochloric 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 Yugawaralite
mindat.org URL:
https://www.mindat.org/min-4376.html
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References for Yugawaralite
Reference List:
Kerr, I. S., Williams, D. J. (1967) The crystal structure of yugawaralite. Zeitschrift für Kristallographie - Crystalline Materials, 125 (125) 220-225 doi:10.1524/zkri.1967.125.125.220
Leimer, H. W., Slaughter, M. (1969) The determination and refinement of the crystal structure of yugawaralite. Zeitschrift für Kristallographie - Crystalline Materials, 130 (1) 88-111 doi:10.1524/zkri.1969.130.1-6.88
Eberlein, G. Donald, Erd, R. C., Weber, Florence, Beatty, and L. B. (1971) New occurrence of yugawaralite from the Chena Hot Springs area Alaska. American Mineralogist, 56 (9-10) 1699-1717
Pongiluppi, D. (1977) A new occurrence of yugawaralite at Osilo, Sardinia. The Canadian Mineralogist, 15 (1) 113-114
Kvick, Å., Artioli, G., Smith, J. V. (1986) Neutron diffraction study of the zeolite yugawaralite at 13 K. Zeitschrift für Kristallographie - Crystalline Materials, 174 (1) 265-281 doi:10.1524/zkri.1986.174.1-4.265
Akizuki, Mizuhiko (1987) An explanation of optical variation in yugawaralite. Mineralogical Magazine, 51 (362) 615-620 doi:10.1180/minmag.1987.051.362.18
Coombs, Douglas S., Alberti, Alberto, Armbruster, Thomas, Artioli, Gilberto, Colella, Carmine, Galli, Ermanno, Grice, Joel D., Liebau, Friedrich, Mandarino, Joseph A., Minato, Hideo, et al. (1997) Recommended nomenclature for zeolite minerals; report of the Subcommittee on Zeolites of the International Mineralogical Association, Commission on New Minerals and Mineral Names. The Canadian Mineralogist, 35 (6). 1571-1606
Tanaka, T., Kimura, R., Akizuki, M., Kudoh, Y. (2002) Origin of low-symmetry growth sectors in edingtonite and yugawaralite, and crystal structure of the k{011} and v{120} sectors of yugawaralite. Mineralogical Magazine, 66 (3) 409-420 doi:10.1180/0026461026630037
Fois, Ettore, Gamba, Aldo, Tabacchi, Gloria, Arletti, Rossella, Quartieri, Simona, Vezzalini, Giovanna (2005) The “template” effect of the extra-framework content on zeolite compression: The case of yugawaralite. American Mineralogist, 90 (1) 28-35 doi:10.2138/am.2005.1653
Localities for Yugawaralite
Showing 46 localities.
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.
Argentina | |
| Bowman et al. (2006) |
| Vattuone et al. (2001) |
| Leal +1 other reference | |
| Robl et al. (2009) |
Canada | |
| Tschernich (1992) |
Chile | |
| Fuentes et al. (2004) |
Costa Rica | |
| Zeledón (2004) |
| Obando-Acuña et al. (2019) |
France | |
| DE ASCENCAO GUEDES R. (2004) |
| Serge Lavarde Collection | |
Hungary | |
| Rappensberger |
Iceland | |
| Weisenberger et al. (2009) |
| Robinson (1986) +2 other references | |
| self collected by Jamison Turnbull |
| Personal collection of Jamison K ... | |
| Robinson (1986) +1 other reference |
| Betz (1981) | |
India | |
| Ottens et al. (2022) |
| Lavinsky (n.d.) |
| Wise (1978) +1 other reference |
| Collection Elmar Lackner and many others |
Italy | |
| Carlini et al. (2018) |
| Ghizzoni et al. (2005) |
| Ghizzoni et al. (2005) | |
| Berg (1982) |
| Gelosa et al. (1999) | |
| Mattioli et al. (2016) |
| Mattioli et al. (2008) +3 other references |
Japan | |
| ONUKI et al. (1988) |
| Konno et al. (1977) |
| Sakurai et al. (1952) |
| Seki et al. (1968) +1 other reference |
| Pinch (1977) +1 other reference |
| Nozomi Sasaki discovery and specimens | |
Jordan | |
| Khoury et al. (1985) |
New Zealand | |
| Railton et al. (1990) |
Ukraine | |
| World of Stones v.9 | |
| Tischenko A. data |
USA | |
| ... |
| Moore (2000) |
| Eberlein et al. (1971) | |
| Bargar et al. (1997) |
| Micro Probe Vol. 7 No. 10 |
| Micro Probe +1 other reference | |
| Bargar et al. (1981) |
| Bargar et al. (1981) |
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Cilaos, Réunion, France