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Gugiaite

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Formula:
Ca2Be(Si2O7)
Colour:
Colourless, yellow
Lustre:
Vitreous
Hardness:
5
Crystal System:
Tetragonal
Member of:
See also hydroxylgugiaite, related to gugiaite by a complex atomic exchange mechanism coupled with protonation.


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Classification of GugiaiteHide

Approved
Approval Year:
1983
9.BB.10

9 : SILICATES (Germanates)
B : Sorosilicates
B : Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination
55.4.2.6

55 : SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
4 : Si2O7 Groups, Generally with No Additional Anions with cations in [8] and lower coordination
14.3.8

14 : Silicates not Containing Aluminum
3 : Silicates of Be

Physical Properties of GugiaiteHide

Vitreous
Colour:
Colourless, yellow
Streak:
White
Hardness:
Cleavage:
Perfect

Optical Data of GugiaiteHide

Type:
Uniaxial (+)
RI values:
nω = 1.664 nε = 1.672
Max Birefringence:
δ = 0.008
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of GugiaiteHide

Formula:
Ca2Be(Si2O7)
IMA Formula:
Ca2BeSi2O7
Common Impurities:
Ti,Zr,Hf,Al,Fe,Mn,Mg,Na,K,F,Cl,P

Crystallography of GugiaiteHide

Crystal System:
Tetragonal
Cell Parameters:
a = 7.43 Å, c = 5.02 Å
Ratio:
a:c = 1 : 0.676
Unit Cell V:
277.13 ų (Calculated from Unit Cell)

Type Occurrence of GugiaiteHide

Synonyms of GugiaiteHide

Other Language Names for GugiaiteHide

German:Gugiait
Spanish:Gugiaita

Relationship of Gugiaite to other SpeciesHide

Member of:
Other Members of this group:
ÅkermaniteCa2Mg(Si2O7)Tet. 4 2m : P4 21m
Alumoåkermanite(Ca,Na)2(Al,Mg,Fe2+)(Si2O7)Tet. 4 2m : P4 21m
Ferri-gehleniteCa2Fe3+AlSiO7
GehleniteCa2Al(AlSiO7)Tet. 4 2m : P4 21m
HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
Hydroxylgugiaite(Ca,□)2(Si,Be)(Be,Si)2O5(OH)2Tet. 4 2m : P4 21m
OkayamaliteCa2B(BSiO7)Tet.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Analcime1 photo of Gugiaite associated with Analcime on mindat.org.
Aegirine1 photo of Gugiaite associated with Aegirine on mindat.org.
Chlorite Group1 photo of Gugiaite associated with Chlorite Group on mindat.org.
Bavenite1 photo of Gugiaite associated with Bavenite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.BB.10ÅkermaniteCa2Mg(Si2O7)Tet. 4 2m : P4 21m
9.BB.10CebolliteCa5Al2(SiO4)3(OH)4Orth.
9.BB.10GehleniteCa2Al(AlSiO7)Tet. 4 2m : P4 21m
9.BB.10HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
9.BB.10Jeffreyite(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)Orth.
9.BB.10OkayamaliteCa2B(BSiO7)Tet.
9.BB.10Alumoåkermanite(Ca,Na)2(Al,Mg,Fe2+)(Si2O7)Tet. 4 2m : P4 21m
9.BB.15BaryliteBe2Ba(Si2O7)Orth.
9.BB.15Barylite-1OBe2Ba(Si2O7)Mon. m : Pm
9.BB.20AndrémeyeriteBaFe2+2(Si2O7)Mon.

Related Minerals - Dana Grouping (8th Ed.)Hide

55.4.2.1FresnoiteBa2Ti(Si2O7)OTet.
55.4.2.2HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
55.4.2.3Jeffreyite(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)Orth.
55.4.2.4LeucophaniteNaCaBeSi2O6FOrth. 2 2 2 : P21 21 21
55.4.2.5Meliphanite(Ca,Na)2(Be,Al)[Si2O6(OH,F)]Tet. 4 : I4

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.3.1PhenakiteBe2SiO4Trig. 3 : R3
14.3.2BertranditeBe4(Si2O7)(OH)2Orth. mm2 : Cmc21
14.3.3BerylliteBe3(SiO4)(OH)2 · H2OOrth.
14.3.4LiberiteLi2BeSiO4Mon. m : Pm
14.3.5ChkaloviteNa2BeSi2O6Orth. mm2 : Fdd2
14.3.6EudidymiteNa2Be2Si6O15 · H2OMon. 2/m : B2/b
14.3.7EpididymiteNa2Be2Si6O15 · H2OOrth. mmm (2/m 2/m 2/m) : Pnma
14.3.9Jeffreyite(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)Orth.
14.3.10Semenovite-(Ce)Na8Ca2FeBe6Ce2Si14O40(OH)4F4Orth. mmm (2/m 2/m 2/m)
14.3.11BaryliteBe2Ba(Si2O7)Orth.
14.3.12Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
14.3.13Hingganite-(Yb)(Yb,Y,REE)2□Be2[SiO4]2(OH)2
14.3.14Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
14.3.15Minasgeraisite-(Y)CaBe2Y2Si2O10Mon. 2/m : P21/b
14.3.16SørenseniteNa4SnBe2Si6O16(OH)4Mon. 2/m : B2/b
14.3.17TrimeriteCaMn2+2Be3(SiO4)3Mon. 2/m : P21/m
14.3.18ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2OMon. 2/m : P21/b
14.3.19Tvedalite(Ca,Mn)4Be3Si6O17(OH)4 · 3H2OOrth.
14.3.20HarstigiteCa6(Mn,Mg)Be4Si6(O,OH)24Orth.
14.3.21SverigeiteNaMnMgSnBe2(SiO4)3(OH)Orth. mmm (2/m 2/m 2/m) : Imma
14.3.22Joesmithite{Pb}{Ca2}{Mg3Fe3+2}(Be2Si6O22)(OH)2Mon.
14.3.23Gadolinite-(Y)Y2Fe2+Be2Si2O10Mon. 2/m : P21/b
14.3.24Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10Mon. 2/m
14.3.25Calciogadolinite-(Y)(YCa)2Fe3+Be2[SiO4]2O2

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 GugiaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Peng Chi-Jui, Tsao Rung-Lung, and Chou Zu-Rin (1962): Gugiaite, Ca2BeSi2O7, a new beryllium mineral and its relation to the melilite group. Scientia Sinica 11(7): 977-988 (in English).
Peng Chi-jui, Tsao Yin-lung, Zou Zu-yin, Chang Lan-chuan, Yin Shu-shen, and Ting Kui-shou (1962): Gugiaite, Ca2BeSi2O7, a new beryllium mineral belonging to the melilite group. Acta Geologica Sinica 42(3), 259-274 (in Chinese with English abstract). - American Mineralogist (1963), 48, 211-212 (abstract).
Neues Jahrbuch für Mineralogie, Abhandlungen, 142, 210-222.

Internet Links for GugiaiteHide

Localities for GugiaiteHide

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.
China (TL)
 
  • Jiangsu Province
    • Suzhou Prefecture
      • Zhangjiagang Co.
        • Tangqiao
Peng Chi-Jui, Tsao Rung-Lung, and Chou Zu-Rin (1962): Scientia Sinica 11 (7), 977-988.
Italy
 
  • Piedmont
    • Verbano-Cusio-Ossola Province
      • Baveno
        • Oltrefiume
          • Mount Camoscio
Grill, E. (1935): I minerali del granito di Baveno, la fayalite. Periodico di Mineralogia, 129-133. - Gallitelli, P. (1936): Le miche del granito di Baveno. . Periodico di Mineralogia, 61-76 - Pagliani, G. (1948): Le Zeoliti del granito di Baveno. Periodico di Mineralogia, 175-188. - Ravagnani, D. (1974): I giacimenti uraniferi italiani - Gruppo Mineralogico Lombardo - Museo Civico di Storia Naturale di Milano, Ed., Milano, 188 pp. - min. Rec. 14 (3), 157-168 - Am. Min. 83, 1330-1334 (1998) - Am. Min. 84, 782-789 (1999). - Guastoni, A. & Pezzotta, F. (2004): Kristiansenite a Baveno, second ritrovamento Mondiale della specie. Rivista Mineralogica Italiana, 4/2004, 247-251. - Guastoni, A., Demartin, F., Pezzotta, F. (2004): Sekaninaite delle pegmatiti granitiche di Feriolo e Baveno (VB). Atti della Società Italiana di Scienze Naturali e del Museo Civico di Storia Naturale di Milano, 145, 59-68. - Mineralogist americano (2005) 90, 1442-1452.
American Mineralogist, 84(5-6), 782-789
Japan
 
  • Ehime Prefecture
    • Inland Sea (Setonaikai)
Matsubara, S. (2002): The Mineral Species of Japan, p27
Norway
 
  • Telemark
    • Porsgrunn
      • Langangen
        • Kokkersvold E18 roadcuts
Larsen, A. O. (2013): Contributions to the mineralogy of the syenite pegmatites in the Larvik Plutonic complex. Norsk Bergverksmuseum Skrifter. 50, 101-109; Grice, J., Kristiansen, R., Friis, H., Rowe, R., Cooper, M.,Poirier, G. and Yang, P. (2016) Hydroxylgugiaite, IMA 2016-009. CNMNC Newsletter No. 31, June 2016, page 696; Mineralogical Magazine, 80, 691–697.
      • Mørje
        • Sagåsen
Larsen, A. O. (2013): Contributions to the mineralogy of the syenite pegmatites in the Larvik Plutonic complex. Norsk Bergverksmuseum Skrifter. 50, 101-109
  • Vestfold
    • Larvik
      • Brunlanes
Identified on a personally collected specimen (Knut Eldjarn) in my collection by Henrik Friis at the Oslo University Mineralogical Museum des. 2013, see Knut Eldjarn photo, Photo id 58820
Russia
 
  • Eastern-Siberian Region
    • Tuva Republic
Tony Nikischer
Mineral and/or Locality  
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