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Piergorite-(Ce)

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About Piergorite-(Ce)Hide

Formula:
Ca8(Ce,Th,La,Nd)2(Al0.5,Fe3+0.5)(◻,Li,Be)2Si6B8O36(OH,F)2
Colour:
colorless to pale yellow
Lustre:
Vitreous
Specific Gravity:
3.67 (Calculated)
Crystal System:
Monoclinic
Name:
After Giancarlo Pierini (b. 1929) and Pietro Gorini (b. 1939), two well-known and keen Italian mineral collectors, members of AMI (Italian Micromineralogical Association).
Acronym of "Pier"ini and "Gor"ini.
This page provides mineralogical data about Piergorite-(Ce).


Classification of Piergorite-(Ce)Hide

Approved
Approval Year:
2005
9.DL.10

9 : SILICATES (Germanates)
D : Inosilicates
L : Inosilicates with 5-periodic double chains, Si10O28
54.2.0.0

54 : NESOSILICATES Borosilicates and Some Beryllosilicates
2 : Borosilicates and Some Beryllosilicates with B in [4] coordination

Physical Properties of Piergorite-(Ce)Hide

Vitreous
Transparency:
Translucent
Colour:
colorless to pale yellow
Tenacity:
Brittle
Cleavage:
Perfect
{010}
Density:
3.67 g/cm3 (Calculated)

Optical Data of Piergorite-(Ce)Hide

Type:
Biaxial (-)
RI values:
nα = 1.717(1) nβ = 1.728(1) nγ = 1.735(1)
2V:
Measured: 68° (2), Calculated: 77°
Max Birefringence:
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of Piergorite-(Ce)Hide

Formula:
Ca8(Ce,Th,La,Nd)2(Al0.5,Fe3+0.5)(◻,Li,Be)2Si6B8O36(OH,F)2
IMA Formula:
Ca8Ce2AlLiSi6B8O36(OH)2
Elements listed:

Crystallography of Piergorite-(Ce)Hide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Setting:
P2/a
Cell Parameters:
a = 28.097(3) Å, b = 4.777(1) Å, c = 10.236(2) Å
β = 96.81(1)°
Ratio:
a:b:c = 5.882 : 1 : 2.143
Unit Cell V:
1,364.18 ų (Calculated from Unit Cell)
Z:
2
Twinning:
polysynthetic twinning on {100}; frequently, they show L-shaped form by further twinning on the {301}

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0004179Piergorite-(Ce)Boiocchi M, Callegari A, Ottolini L (2006) The crystal structure of piergorite-(Ce), Ca8Ce2(Al0.5Fe3+0.5)Sum1(X,Li,Be)2Si6B8O36(OH,F)2: A new borosilicate from Vetralla, Italy, with a modified hellandite-type chain American Mineralogist 91 1170-11772006Vetralla, Italy0293
CIF Raw Data - click here to close

Type Occurrence of Piergorite-(Ce)Hide

Place of Conservation of Type Material:
Museo di Mineralogia, Dipartimento di Scienzedella Terra, Universita degli Studi di Pavia, Italy with catalog number 2005-001 OL.
Geological Setting of Type Material:
extremely thin, platy micro crystals and aggregates perched within small seams in a volcanic ejecta.
Associated Minerals at Type Locality:
Reference:
Boiocchi, M., Callegari, A., Ottolini, L. (2006): The crystal structure of piergorite-(Ce), Ca8Ce2(Al0.5Fe3+0.5)Σ1(,Li,Be)2Si6B8O36(OH,F)2: A new borosilicate from Vetralla, Italy, with a modified hellandite-type chain. American Mineralogist, 91, 1170-1177.

Synonyms of Piergorite-(Ce)Hide

Other Language Names for Piergorite-(Ce)Hide

Related Minerals - Nickel-Strunz GroupingHide

9.DL.05InesiteCa2(Mn,Fe)7Si10O28(OH)2 · 5H2OTric. 1 : P1

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 Piergorite-(Ce)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Boiocchi, M., Callegari, A., Ottolini, L. (2006): The crystal structure of piergorite-(Ce), Ca8Ce2(Al0.5Fe3+0.5)Σ1(,Li,Be)2Si6B8O36(OH,F)2: A new borosilicate from Vetralla, Italy, with a modified hellandite-type chain. American Mineralogist, 91, 1170-1177.
Ciriotti, M.E. & Bonacina, E. (2007): Alloriite e piergorite-(Ce): tre AMIci per due nuove specie italiane. Micro (sistematica), 2/2007, 35-50.

Internet Links for Piergorite-(Ce)Hide

Localities for Piergorite-(Ce)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.
Italy
 
  • Lazio
    • Viterbo Province
      • Vetralla
Pucci, R. (2007): Due nuove specie mineralogiche laziali: alloriite e piergorite-(Ce). Il Cercapietre, 1-2/2007, 24-40.
American Mineralogist, Volume 91, pages 1170–-1177, 2006
 
Mineral and/or Locality  
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