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Gugiaite

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Big Photo

Seula mine (ex Montecatini quarry), Mount Camoscio, Oltrefiume, Baveno, Verbano-Cusio-Ossola Province, Piedmont, Italy
© sergio varvello

Show Gugiaite Photos (11)



Formula:
Ca
 
2
Be(Si
 
2
O
 
7
)
System:TetragonalColour:Colourless
Lustre:VitreousHardness:5
Member of:Melilite Group
This page provides mineralogical data about Gugiaite.

Classification of Gugiaite

IMA status:Approved 1983
Strunz 8th edition ID:8/C.02-30
Nickel-Strunz 10th (pending) edition ID:9.BB.10

9 : SILICATES (Germanates)
B : Sorosilicates
B : Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination
Dana 8th edition ID: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
Hey's CIM Ref.:14.3.8

14 : Silicates not Containing Aluminum
3 : Silicates of Be
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Type Occurrence of Gugiaite

Type Locality:Gujia village, Tangqiao, Zhangjiagang Co., Suzhou Prefecture, Jiangsu Province, China
Year of Discovery:1962

Physical Properties of Gugiaite

Lustre:Vitreous
Colour:Colourless
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
Maximum Birefringence:δ = 0.008

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Gugiaite

Formula:
Ca
 
2
Be(Si
 
2
O
 
7
)
Essential elements:Be, Ca, O, Si
All elements listed in formula:Be, Ca, O, Si
Common Impurities:Ti,Zr,Hf,Al,Fe,Mn,Mg,Na,K,F,Cl,P

Relationship of Gugiaite to other Species

Member of:Melilite Group
Other Members of Group:

- +
Åkermanite
Ca
 
2
Mg(Si
 
2
O
 
7
)
Alumoåkermanite
(Ca,Na)
 
2
(Al,Mg,Fe
2+
 
)(Si
 
2
O
 
7
)
Gehlenite
Ca
 
2
Al(AlSiO
 
7
)
Hardystonite
Ca
 
2
Zn(Si
 
2
O
 
7
)
Okayamalite
Ca
 
2
B(BSiO
 
7
)
Related Minerals - Nickel-Strunz Grouping):

- +
9.BB.10Åkermanite
Ca
 
2
Mg(Si
 
2
O
 
7
)
9.BB.10Cebollite
Ca
 
5
Al
 
2
(SiO
 
4
)
 
3
(OH)
 
4
9.BB.10Gehlenite
Ca
 
2
Al(AlSiO
 
7
)
9.BB.10Hardystonite
Ca
 
2
Zn(Si
 
2
O
 
7
)
9.BB.10Jeffreyite
(Ca,Na)
 
2
(Be,Al)(Si
 
2
O
 
7
,HSi
 
2
O
 
7
)
9.BB.10Okayamalite
Ca
 
2
B(BSiO
 
7
)
9.BB.10Alumoåkermanite
(Ca,Na)
 
2
(Al,Mg,Fe
2+
 
)(Si
 
2
O
 
7
)
9.BB.15Barylite
Be
 
2
Ba(Si
 
2
O
 
7
)
9.BB.15Clinobarylite
Be
 
2
Ba(Si
 
2
O
 
7
)
9.BB.20Andrémeyerite
Fe
2+
2
Ba(Si
 
2
O
 
7
)
Related Minerals - Hey's Index Grouping:

- +
14.3.1Phenakite
Be
 
2
SiO
 
4
14.3.2Bertrandite
Be
 
4
(Si
 
2
O
 
7
)(OH)
 
2
14.3.3Beryllite
Be
 
3
(SiO
 
4
)(OH)
 
2
 · H
 
2
O
14.3.4Liberite
Li
 
2
BeSiO
 
4
14.3.5Chkalovite
Na
 
2
BeSi
 
2
O
 
6
14.3.6Eudidymite
Na
 
2
Be
 
2
Si
 
6
O
 
15
 · H
 
2
O
14.3.7Epididymite
Na
 
2
Be
 
2
Si
 
6
O
 
15
 · H
 
2
O
14.3.9Jeffreyite
(Ca,Na)
 
2
(Be,Al)(Si
 
2
O
 
7
,HSi
 
2
O
 
7
)
14.3.10Semenovite-(Ce)
Na
 
8
Ca
 
2
FeBe
 
6
Ce
 
2
Si
 
14
O
 
40
(OH)
 
4
F
 
4
14.3.11Barylite
Be
 
2
Ba(Si
 
2
O
 
7
)
14.3.12Hingganite-(Ce)
(Ce,REE)
 
2
(□,Fe
2+
 
)Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2
14.3.13Hingganite-(Yb)
(Yb,Y,REE)
 
2
□Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2
14.3.14Hingganite-(Y)
(Y,REE,Ca)
 
2
(□,Fe
2+
 
)Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2
14.3.15Minasgeraisite-(Y)
CaBe
 
2
Y
 
2
Si
 
2
O
 
10
14.3.16Sørensenite
Na
 
4
SnBe
 
2
Si
 
6
O
 
16
(OH)
 
4
14.3.17Trimerite
CaMn
2+
2
Be
 
3
(SiO
 
4
)
 
3
14.3.18Chiavennite
CaMnBe
 
2
Si
 
5
O
 
13
(OH)
 
2
 · 2H
 
2
O
14.3.19Tvedalite
(Ca,Mn)
 
4
Be
 
3
Si
 
6
O
 
17
(OH)
 
4
 · 3H
 
2
O
14.3.20Harstigite
Ca
 
6
(Mn,Mg)Be
 
4
Si
 
6
(O,OH)
 
24
14.3.21Sverigeite
NaMnMgSnBe
 
2
(SiO
 
4
)
 
3
(OH)
14.3.22Joesmithite
{Pb}{Ca
 
2
}{Mg
 
3
Fe
3+
2
}(Be
 
2
Si
 
6
O
 
22
)(OH)
 
2
14.3.23Gadolinite-(Y)
Y
 
2
Fe
2+
 
Be
 
2
Si
 
2
O
 
10
14.3.24Gadolinite-(Ce)
(Ce,La,Nd,Y)
 
2
Fe
2+
 
Be
 
2
Si
 
2
O
 
10
14.3.25Calciogadolinite-(Y)
(YCa)
 
2
Fe
3+
 
Be
 
2
[SiO
 
4
]
 
2
O
 
2

Other Names for Gugiaite

Synonyms:
IMA1983-072
Other Languages:
German:Gugiait
Russian:Гугиаит
Spanish:Gugiaita

Other Information

Health Warning: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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Gugiaite details from Handbook of Mineralogy (PDF)
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    • Localities for Gugiaite

    Hide Locality List
    (TL) indicates type locality. ? 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
    		American Mineralogist, 84(5-6), 782-789
    Japan
     
    • Ehime Prefecture
      • Inland Sea (Setonaikai)
    		Matsubara, S. (2002): The Mineral Species of Japan, p27
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 18th Jun 2011 15:58:23
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