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Gugiaite
Gugiaite is a melilite mineral, named for the Chinese village of Gugia where it was first discovered. Its chemical formula is Ca2BeSi2O7 It occurs mostly in skarns with melanite adjacent to an alkali syenite and has no economic value. Its crystals are small tetragonal tablets with vitreous luster and perfect cleavage. It is colorless and transparent with a density of three. The mineral belongs to space group P-421m and is strongly piezoelectric.
Shortly after the discovery of gugiaite, it was noted that a new name was unnecessary as it could have been considered an end member of meliphanite, (Ca,Na)2Be(Si,Al)2(O,F)2 differing mainly in containing much less Na and F (Fleischer 1963). Recent data have confirmed that gugiaite does differ from meliphanite optically and structurally (Grice and Hawthorne 2002). Gugiaite is a melilite and is distinctly different from other beryllium minerals such as meliphanite and leucophanite (Grice and Hawthorne 2002). Gugiaite is named for its locality near the village of Gugia, China (Peng et al. 1962). Incongruent information exists regarding Gugia; consequently the actual location of this village within China is unclear (de Fourestier 2005). Gujia is most often referenced as being in either Jiangsu Province or Liaoning Province (Yang et al. 2001; Mandarino 2005).
== Composition ==
Gugiaite has an ideal chemical formula of Ca2BeSi2O7 and is a member of the melilite and sorosilicate (Si2O7 ) groups (Peng et al. 1962). It is chemically similar to jeffreyite (Ca,Na)2(), meliphanite (Ca,Na)2(), and leucophanite (Ca,Na)2() in that they all contain essential calcium, beryllium, and silicon (Hawthorne and Huminicki 2002). Two chemical analyses gave similar results and one is as follows: SiO2 44.90, Al2O3 2.17, Fe2O3 0.11, MnO 0.07, MgO 0.38, CaO 40.09, BeO 9.49, Na2O 0.72, K2O 0.20, H2O- 0.36, H2O+ 0.90, F 0.25, Cl 0.18, P2O5 0.08, TiO2 trace, -O=(F,Cl)2 0.15, sum 99.94, 99.79% (Fleischer 1963). Common impurities are Ti, Zr, Hf, Al, Fe, Mn, Mg, Na, K, F, Cl, and P (Fleischer 1963).
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