Chiappinoite-(Y)
A valid IMA mineral species
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About Chiappinoite-(Y)
Luigi Chiappino
Formula:
Y2Mn(Si3O7)4
Colour:
Colourless
Lustre:
Vitreous
Hardness:
6
Specific Gravity:
3.09
Crystal System:
Orthorhombic
Name:
Honours the collector Luigi Chiappino of Milan, Italy, who discovered the mineral.
Type Locality:
Other silicates with dominant Y and Mn are bussyite-(Y) and perettiite-(Y).
The structure is based on 3-tetrahedra-thick silicate layers comprising sinuous batisite-like chains. 4-membered silicate rings are locaed above and below these chains. [8]Y and [8]Mn sites are between the silicate layers. The crystal structure is essentially identical to that of the synthetic compounds PrNaSi6O14 and NdNaSi6O14, except that these have an additional Na site (12-coordinated) within the "cage" in the silicate layer.
The structure is based on 3-tetrahedra-thick silicate layers comprising sinuous batisite-like chains. 4-membered silicate rings are locaed above and below these chains. [8]Y and [8]Mn sites are between the silicate layers. The crystal structure is essentially identical to that of the synthetic compounds PrNaSi6O14 and NdNaSi6O14, except that these have an additional Na site (12-coordinated) within the "cage" in the silicate layer.
Unique Identifiers
Mindat ID:
46394
Long-form identifier:
mindat:1:1:46394:0
IMA Classification of Chiappinoite-(Y)
Classification of Chiappinoite-(Y)
9.DP.45
9 : SILICATES (Germanates)
D : Inosilicates
P : Transitional ino-phyllosilicate structures
9 : SILICATES (Germanates)
D : Inosilicates
P : Transitional ino-phyllosilicate structures
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 |
|---|---|---|
| Cap-Y | 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 Chiappinoite-(Y)
Vitreous
Transparency:
Transparent
Colour:
Colourless
Hardness:
6 on Mohs scale
Comment:
about 6
Tenacity:
Brittle
Cleavage:
Perfect
on {001}.
on {001}.
Fracture:
Irregular/Uneven
Density:
3.09 g/cm3 (Measured) 3.073 g/cm3 (Calculated)
Optical Data of Chiappinoite-(Y)
Type:
Biaxial (-)
RI values:
nα = 1.590(1) nβ = 1.5978(10) nγ = 1.5982(10)
2V:
Measured: 24° (1), Calculated: 25°
Max. Birefringence:
δ = 0.008
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
Dispersion:
Exhibits no dispersion
Pleochroism:
Non-pleochroic
Chemistry of Chiappinoite-(Y)
Mindat Formula:
Y2Mn(Si3O7)4
Element Weights:
Elements listed:
Common Impurities:
Ce,Ca,Fe(II),Dy,Na,Nd,Er,Gd,La,Yb
Crystallography of Chiappinoite-(Y)
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Ibam
Cell Parameters:
a = 7.5549(3) Å, b = 15.2342(2) Å, c = 19.6418(14) Å
Ratio:
a:b:c = 0.496 : 1 : 1.289
Unit Cell V:
2260.6 ų
Z:
4
Morphology:
Thin to thick prisms, up to 1 mm long, with blunt chisel-like terminations. Forms observed: {100}, {010}, {001}, {110} and {011}.
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) |
|---|---|---|---|---|---|---|---|
| 0020339 | Chiappinoite-(Y) | Kampf A R, Housley R M (2015) Chiappinoite-(Y), Y2Mn(Si3O7)4, a new layer silicate found in peralkaline syenitic ejecta from the Agua de Pau volcano, Azores European Journal of Mineralogy 27 91-97 | 2015 | Agua de Pau volcano, San Miguel Island, Azores District, Portugal | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.84 Å | (90) |
| 4.129 Å | (52) |
| 3.977 Å | (48) |
| 3.544 Å | (100) |
| 3.203 Å | (48) |
| 2.999 Å | (71) |
| 2.478 Å | (67) |
| 2.065 Å | (57) |
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) | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Chiappinoite-(Y)
Place of Conservation of Type Material:
Cotype material is deposited in the collections of the Mineral Sciences Department, Natural History Museum of Los Angeles, USA, catalogue numbers 64166, 64167, 64168, 64169 and 64170
Geological Setting of Type Material:
In peralkaline syenitic ejecta from the Água de Pau volcano.
Synonyms of Chiappinoite-(Y)
Other Language Names for Chiappinoite-(Y)
Dutch:Chiappinoiet-(Y)
German:Chiappinoit-(Y)
Common Associates
Associations Based on Photo Data:
| 4 photos of Chiappinoite-(Y) associated with Aegirine | NaFe3+Si2O6 |
| 4 photos of Chiappinoite-(Y) associated with Fluornatropyrochlore | (Na,Pb,Ca,REE,U)2Nb2O6F |
| 3 photos of Chiappinoite-(Y) associated with Ferro-katophorite | Na(CaNa)(Fe2+4Al)(AlSi7O22)(OH)2 |
| 2 photos of Chiappinoite-(Y) associated with Astrophyllite | K2NaFe2+7Ti2[Si4O12]2O2(OH)4F |
| 1 photo of Chiappinoite-(Y) associated with Titanite | CaTiO(SiO4) |
Related Minerals - Strunz-mindat Grouping
| 9.DP.05 | Meliphanite | (Ca,Na)2(Be,Al)[Si2O6(OH,F)] |
| 9.DP.15 | Leucosphenite | BaNa4Ti2B2Si10O30 |
| 9.DP.20 | Ferriprehnite | Ca2Fe3+(Si3AlO10)(OH)2 |
| 9.DP.20 | Prehnite | Ca2Al2Si3O10(OH)2 |
| 9.DP.25 | Amstallite | CaAl[(Al,Si)4O8(OH)2](OH)2 · (H2O,Cl) |
| 9.DP.30 | Kvanefjeldite | Na4(Ca,Mn)(Si3O7)2(OH)2 |
| 9.DP.35 | Lemoynite | (Na,K)2CaZr2Si10O26 · 5H2O |
| 9.DP.35 | Hogarthite | (Na,K)2CaTi2Si10O26 · 8H2O |
| 9.DP.35 | Natrolemoynite | Na4Zr2Si10O26 · 9H2O |
| 9.DP.40 | Altisite | Na3K6Ti2Al2Si8O26Cl3 |
| 9.DP.50 | Esquireite | BaSi6O13 · 7H2O |
| 9.DP.55 | Lavinskyite | K(LiCu)Cu6(Si4O11)2(OH)4 |
| 9.DP.55 | Plancheite | Cu8(Si8O22)(OH)4 · H2O |
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 Chiappinoite-(Y)
mindat.org URL:
https://www.mindat.org/min-46394.html
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References for Chiappinoite-(Y)
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2014) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC), CNMNC Newsletter No. 22. Mineralogical Magazine, 78 (5) 1241-1248 doi:10.1180/minmag.2014.078.5.10
Belakovskiy, Dmitriy I., Cámara, Fernando, Gagne, Olivier C., Uvarova, Yulia (2015) New Mineral Names. American Mineralogist, 100 (8) 2005-2013 doi:10.2138/am-2015-nmn1008-98
Localities for Chiappinoite-(Y)
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.
Portugal (TL) | |
| Kampf et al. (2015) |
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Água de Pau Volcano, São Miguel, Azores, Portugal