A new langasite structure piezoelectric single crystal Sr 3 Ga 2 Ge 4 O 1 4 (SGG) had been grown by the vertical Bridgman method for the first time. Polycrystalline SGG powder was synthesized prior to growth and [0001] oriented La 3 Ga 5 SiO 1 4 (LGS, langasite) crystal was used as the seeds. SGG crystals up to 28mm in diameter and 80mm in length were grown reproductively. X-ray fluorescence spectrum showed that only negligible amount of La 3 + and Si 4 + ions appeared in as-grown SGG crystals. Differential thermal analysis (DTA) and thermal gravity (TG) curves presents the melting point of SGG crystal at 1404.5 o C. The average thermal expansion coefficients along the crystallographic a- and c-axes from 293 to 973K were measured to be 6.5x10 - 6 and 5.8x10 - 6 K - 1 , respectively. The transmittance spectra from 250 to 2500nm were measured and the transmittance of SGG crystal exceeds 80% above 350nm. The density was measured to be 5.112g/cm 3 .