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Chiappinoite-(Y)

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About Chiappinoite-(Y)Hide

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.
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.


Classification of Chiappinoite-(Y)Hide

Approved
Approval Year:
2014

Physical Properties of Chiappinoite-(Y)Hide

Vitreous
Transparency:
Transparent
Colour:
Colourless
Hardness:
Comment:
about 6
Tenacity:
Brittle
Cleavage:
Perfect
on {001}.
Fracture:
Irregular/Uneven
Density:
3.09 g/cm3 (Measured)    3.073 g/cm3 (Calculated)

Optical Data of Chiappinoite-(Y)Hide

Type:
Biaxial (-)
RI values:
nα = 1.000(1) nβ = 1.598(10) nγ = 1.598(10)
2V:
Measured: 24° (1), Calculated: 25°
Max Birefringence:
δ = 0.598
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
Exhibits no dispersion
Pleochroism:
Non-pleochroic

Chemical Properties of Chiappinoite-(Y)Hide

Formula:
Y2Mn(Si3O7)4
Common Impurities:
Ce,Ca,Fe(II),Dy,Na,Nd,Er,Gd,La,Yb

Crystallography of Chiappinoite-(Y)Hide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/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}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.84 (90)
4.129 (52)
3.977 (48)
3.544 (100)
3.203 (48)
2.999 (71)
2.478 (67)
2.065 (57)

Type Occurrence of Chiappinoite-(Y)Hide

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)Hide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Chiappinoite-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Housley, R.M. (2014) Chiappinoite-(Y), IMA 2014-040. CNMNC Newsletter No. 22, October 2014, page 1242; Mineralogical Magazine: 78: 1241-1248.
Belakovskiy, D.I., Cámara, F., Gagne, O.C., Uvarova, Y. (2015) New mineral names. American Mineralogist: 100: 2005-2013.
Kampf, A.R., Housley, R.M. (2015) Chiappinoite-(Y), Y2Mn(Si3O7)4, a new layer silicate found in peralkaline syenitic ejecta from the Água de Pau volcano, Azores. European Journal of Mineralogy: 27: 91-97.

Internet Links for Chiappinoite-(Y)Hide

Localities for Chiappinoite-(Y)Hide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Portugal (TL)
 
  • Azores
    • São Miguel Island
      • Água de Pau Massif
Kampf, A.R. & Housley, R.M. (2015): Chiappinoite-(Y), Y2Mn(Si3O7)4, a new layer silicate found in peralkaline syenitic ejecta from the Água de Pau volcano, Azores. European Journal of Mineralogy, 27, 91-97.
Mineral and/or Locality  
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