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Gugiaite

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Formula:
Ca2Be(Si2O7)
System:
Tetragonal
Colour:
Colourless, yellow
Lustre:
Vitreous
Hardness:
5
Member of:
This page provides mineralogical data about Gugiaite.

Classification of Gugiaite

Approved 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
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First Recorded Occurrence of Gugiaite

Year of Discovery:
1962

Physical Properties of Gugiaite

Vitreous
Colour:
Colourless, yellow
Streak:
White
Hardness (Mohs):
5
Cleavage:
Perfect

Crystallography of Gugiaite

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

Optical Data of Gugiaite

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 Gugiaite

Formula:
Ca2Be(Si2O7)
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Zr,Hf,Al,Fe,Mn,Mg,Na,K,F,Cl,P

Relationship of Gugiaite to other Species

Member of:
Other Members of Group:
ÅkermaniteCa2Mg(Si2O7)
Alumoåkermanite(Ca,Na)2(Al,Mg,Fe2+)(Si2O7)
Ferri-gehleniteCa2Fe3+AlSiO7
GehleniteCa2Al(AlSiO7)
HardystoniteCa2Zn(Si2O7)
OkayamaliteCa2B(BSiO7)
9.BB.10ÅkermaniteCa2Mg(Si2O7)
9.BB.10CebolliteCa5Al2(SiO4)3(OH)4
9.BB.10GehleniteCa2Al(AlSiO7)
9.BB.10HardystoniteCa2Zn(Si2O7)
9.BB.10Jeffreyite(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)
9.BB.10OkayamaliteCa2B(BSiO7)
9.BB.10Alumoåkermanite(Ca,Na)2(Al,Mg,Fe2+)(Si2O7)
9.BB.15BaryliteBe2Ba(Si2O7)
9.BB.15Barylite-1OBe2Ba(Si2O7)
9.BB.20AndrémeyeriteBaFe22+(Si2O7)
14.3.1PhenakiteBe2SiO4
14.3.2BertranditeBe4(Si2O7)(OH)2
14.3.3BerylliteBe3(SiO4)(OH)2 · H2O
14.3.4LiberiteLi2BeSiO4
14.3.5ChkaloviteNa2BeSi2O6
14.3.6EudidymiteNa2Be2Si6O15 · H2O
14.3.7EpididymiteNa2Be2Si6O15 · H2O
14.3.9Jeffreyite(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)
14.3.10Semenovite-(Ce)Na8Ca2FeBe6Ce2Si14O40(OH)4F4
14.3.11BaryliteBe2Ba(Si2O7)
14.3.12Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2
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)2
14.3.15Minasgeraisite-(Y)CaBe2Y2Si2O10
14.3.16SørenseniteNa4SnBe2Si6O16(OH)4
14.3.17TrimeriteCaMn22+Be3(SiO4)3
14.3.18ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2O
14.3.19Tvedalite(Ca,Mn)4Be3Si6O17(OH)4 · 3H2O
14.3.20HarstigiteCa6(Mn,Mg)Be4Si6(O,OH)24
14.3.21SverigeiteNaMnMgSnBe2(SiO4)3(OH)
14.3.22Joesmithite{Pb}{Ca2}{Mg3Fe23+}(Be2Si6O22)(OH)2
14.3.23Gadolinite-(Y)Y2Fe2+Be2Si2O10
14.3.24Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10
14.3.25Calciogadolinite-(Y)(YCa)2Fe3+Be2[SiO4]2O2

Other Names for Gugiaite

Name in Other Languages:
German:Gugiait
Spanish:Gugiaita

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.

References for Gugiaite

Reference List:
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 Gugiaite

Localities for Gugiaite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
China
 
  • 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
      • 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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