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Gugiaite

Big Photo

Seula mine and Locatelli quarry (ex Montecatini quarry), Mount Camoscio, Oltrefiume, Baveno, Verbano-Cusio-Ossola Province, Piedmont, Italy
© Knut Eldjarn

Show Gugiaite Photos (2)
Formula:
Ca
 
2
Be[Si
 
2
O
 
7
]
System:TetragonalColour:Colourless
Lustre:VitreousHardness:5


Melilite Group.

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

Related Minerals - Nickel-Strunz Grouping):

- +
9.BB.10Åkermanite
Ca
 
2
Mg[Si
 
2
O
 
7
]
9.BB.10Cebollite
Ca
 
5
Al
 
2
Si
 
3
O
 
12
(OH)
 
4
 or near
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
 
6
(O,OH)]
9.BB.10Okayamalite
Ca
 
2
B[BSiO
 
7
]
9.BB.15Barylite
BaBe
 
2
[Si
 
2
O
 
7
]
9.BB.15Clinobarylite
BaBe
 
2
Si
 
2
O
 
7
9.BB.20Andrémeyerite
BaFe
2+
2
[Si
 
2
O
 
7
]
Related Minerals - Hey's Index Grouping:

- +
14.3.1Phenakite
Be
 
2
[SiO
 
4
]
14.3.2Bertrandite
Be
 
4
[(OH)
 
2
|Si
 
2
O
 
7
]
14.3.3Beryllite
Be
 
3
[(OH)
 
2
|SiO
 
4
] · H
 
2
O
14.3.4Liberite
Li
 
2
Be[SiO
 
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
 
6
(O,OH)]
14.3.10Semenovite-(Ce)
(Na,Ca)
 
9
Fe
2+
 
(Ce,La)
 
2
[(Si,Be)
 
5
(O,OH,F)
 
12
]
 
4
14.3.11Barylite
BaBe
 
2
[Si
 
2
O
 
7
]
14.3.12Hingganite-(Ce)
Ce
 
2
□Be
 
2
Si
 
2
O
 
8
(OH)
 
2
14.3.13Hingganite-(Yb)
(Yb,Y)Be[OH|SiO
 
4
]
14.3.14Hingganite-(Y)
(Y,Yb,Er)Be[OH|SiO
 
4
]
14.3.15Minasgeraisite-(Y)
Y
 
2
CaBe
 
2
[O|SiO
 
4
]
 
2
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
Si
 
3
O
 
12
(OH)
14.3.22Joesmithite
[(Ca,Pb)][(Ca,Pb)
 
2
][(Mg,Fe
2+
 
)
 
5
][(OH)
 
2
|BeSi
 
7
O
 
22
]
14.3.23Gadolinite-(Y)
Y
 
2
Fe
2+
 
Be
 
2
[O|SiO
 
4
]
 
2
14.3.24Gadolinite-(Ce)
(Ce,La,Nd,Y)
 
2
Fe
2+
 
Be
 
2
[O|SiO
 
4
]
 
2
14.3.25Calciogadolinite
(Y,Ca)
 
2
(Fe,Fe)Be
 
2
Si
 
2
(O,OH)
 
10

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.

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Internet Links for Gugiaite

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    Localities for Gugiaite

    (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
    Mineral and/or Locality
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