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About Piergorite-(Ce)Hide

colorless to pale yellow
Specific Gravity:
3.67 (Calculated)
Crystal System:
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

Approval Year:

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

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

Physical Properties of Piergorite-(Ce)Hide

colorless to pale yellow
3.67 g/cm3 (Calculated)

Optical Data of Piergorite-(Ce)Hide

Biaxial (-)
RI values:
nα = 1.717(1) nβ = 1.728(1) nγ = 1.735(1)
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:

Chemical Properties of Piergorite-(Ce)Hide

IMA Formula:
Elements listed:

Crystallography of Piergorite-(Ce)Hide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 28.097(3) Å, b = 4.777(1) Å, c = 10.236(2) Å
β = 96.81(1)°
a:b:c = 5.882 : 1 : 2.143
Unit Cell V:
1,364.18 ų (Calculated from Unit Cell)
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:
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.
  • 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
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