Gugiaite
A valid IMA mineral species
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About Gugiaite
Formula:
Ca2Be[Si2O7]
Colour:
Colourless, yellow
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
3.0336
Crystal System:
Tetragonal
Member of:
Name:
Named for Gujia village, Jiangsu, China, near the type locality.
See also hydroxylgugiaite, related to gugiaite by a complex atomic exchange mechanism coupled with protonation.
Unique Identifiers
Mindat ID:
1769
Long-form identifier:
mindat:1:1:1769:1
GUID
(UUID V4):
(UUID V4):
6bd603a8-51d7-4ba9-b178-4e33c73663a6
IMA Classification of Gugiaite
Approved
IMA Formula:
Ca2BeSi2O7
Approval year:
1983
First published:
1962
Classification of Gugiaite
9.BB.10
9 : SILICATES (Germanates)
B : Sorosilicates
B : Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination
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
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
14 : Silicates not Containing Aluminum
3 : Silicates of Be
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Gug | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Gugiaite
Vitreous
Transparency:
Transparent
Colour:
Colourless, yellow
Streak:
White
Hardness:
5 on Mohs scale
Cleavage:
Perfect
Perfect {010}, distinct {001}, poor {110}
Perfect {010}, distinct {001}, poor {110}
Fracture:
Irregular/Uneven
Density:
3.0336(22) g/cm3 (Measured) 3.03 g/cm3 (Calculated)
Comment:
Measured with pycnometer; calculated from optical data gives 3.0628
Optical Data of Gugiaite
Type:
Uniaxial (+)
RI values:
nω = 1.664(1) nε = 1.672(1)
Max Birefringence:
δ = 0.008
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Chemistry of Gugiaite
Mindat Formula:
Ca2Be[Si2O7]
Elements listed:
Common Impurities:
Ti,Zr,Hf,Al,Fe,Mn,Mg,Na,K,F,Cl,P
Crystallography of Gugiaite
Crystal System:
Tetragonal
Class (H-M):
4 2m - Scalenohedral
Space Group:
P4 2m
Cell Parameters:
a = 7.48(2) Å, c = 5.044(3) Å
Ratio:
a:c = 1 : 0.674
Unit Cell V:
282.21 ų (Calculated from Unit Cell)
Z:
2
Morphology:
{001}, {011}, {111}, {110}
Twinning:
None observed
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0014911 | Gugiaite | Yang Z, Fleck M, Pertlik F, Tillmanns E, Tao K (2001) The crystal structure of natural gugiaite, Ca2BeSi2O7 Note, z coordinate of Ca is altered to reproduce reported Ca-O bond lengths Neues Jahrbuch fur Mineralogie, Monatshefte 2001 186-192 | 2001 | skarn rocks in the Gugia alkaline complex, Liaoning Province, China | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.765 Å | (100) |
1.709 Å | (70) |
1.485 Å | (70) |
5.25 Å | (40) |
2.97 Å | (40) |
2.359 Å | (40) |
2.315 Å | (40) |
Comments:
Gugia, China. Data from the type description.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-𝑇 alteration and/or metamorphism | |
31 : Thermally altered carbonate, phosphate, and iron formations | |
Stage 4b: Highly evolved igneous rocks | >3.0 |
34 : Complex granite pegmatites |
Type Occurrence of Gugiaite
General Appearance of Type Material:
Clear tetragonal tablets, mostly 2-3 mm across and 0.3-0.5 mm thick in cavities and disseminated in melanite.
Geological Setting of Type Material:
Skarn zones of alkaline rocks
Associated Minerals at Type Locality:
Reference:
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.
Synonyms of Gugiaite
Other Language Names for Gugiaite
Relationship of Gugiaite to other Species
Member of:
Other Members of this group:
Åkermanite | Ca2Mg[Si2O7] | Tet. 4 2m : P4 21m |
Alumoåkermanite | (CaNa)Al[Si2O7] | Tet. 4 2m : P4 21m |
Bennesherite | Ba2Fe2+[Si2O7] | Tet. 4 2m : P4 21m |
Ferri-gehlenite | Ca2Fe3+[AlSiO7] | |
Gehlenite | Ca2Al[AlSiO7] | Tet. 4 2m : P4 21m |
Hardystonite | Ca2Zn[Si2O7] | Tet. 4 2m : P4 21m |
Hydroxylgugiaite | (Ca,◻)2(Si,Be)[(Be,Si)2O5.5(OH)1.5] | Tet. 4 2m : P4 21m |
Okayamalite | Ca2B[BSiO7] | Tet. 4 2m : P4 21m |
Common Associates
Associated Minerals Based on Photo Data:
3 photos of Gugiaite associated with Fluorite | CaF2 |
1 photo of Gugiaite associated with Analcime | Na(AlSi2O6) · H2O |
1 photo of Gugiaite associated with Aegirine | NaFe3+Si2O6 |
1 photo of Gugiaite associated with Aeschynite-(Y) | (Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6 |
1 photo of Gugiaite associated with Chlorite Group | |
1 photo of Gugiaite associated with Bavenite | Ca4Be2Al2Si9O26(OH)2 |
1 photo of Gugiaite associated with Albite | Na(AlSi3O8) |
Related Minerals - Strunz-mindat Grouping
9.BB.10 | Åkermanite | Ca2Mg[Si2O7] |
9.BB.10 | Cebollite | Ca5Al2(SiO4)3(OH)4 |
9.BB.10 | Gehlenite | Ca2Al[AlSiO7] |
9.BB.10 | Hardystonite | Ca2Zn[Si2O7] |
9.BB.10 | Jeffreyite | (Ca,Na)2(Be,Al)(Si2O7,HSi2O7) |
9.BB.10 | Okayamalite | Ca2B[BSiO7] |
9.BB.10 | Ferri-gehlenite | Ca2Fe3+[AlSiO7] |
9.BB.10 | Alumoåkermanite | (CaNa)Al[Si2O7] |
9.BB.10 | Hydroxylgugiaite | (Ca,◻)2(Si,Be)[(Be,Si)2O5.5(OH)1.5] |
9.BB.15 | Barylite | Be2Ba(Si2O7) |
9.BB.15 | Barylite-1O | Be2Ba(Si2O7) |
9.BB.20 | Andrémeyerite | BaFe2+2(Si2O7) |
9.BB.20 | Bennesherite | Ba2Fe2+[Si2O7] |
Other Information
Electrical:
Strongly piezoelectric.
Thermal Behaviour:
Fuses at 950°C with Na2CO3 or NaOH.
Notes:
Soluble in hot HCl, HNO3 and H2SO4 (all 1:1), with separation of some gelatinous silica.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Gugiaite
mindat.org URL:
https://www.mindat.org/min-1769.html
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Please feel free to link to this page.
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References for Gugiaite
Reference List:
Localities for Gugiaite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
China (TL) | |
| Peng Chi-Jui et al. (1962) |
Italy | |
| Ciriotti et al. (2021) |
Ciriotti et al. (2021) | |
| Grill (1935) |
Pezzotta et al. (1999) | |
Japan | |
| Matsubara (2002) |
Norway | |
| Larsen (2013) |
| Grice et al. (2013) +2 other references |
| Identified on a personally collected specimen (Knut Eldjarn) |
Russia | |
| Tony Nikischer |
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Seula mine, Mount Camoscio, Oltrefiume, Baveno, Verbano-Cusio-Ossola Province, Piedmont, Italy