Design a minimalistic scientific poster featuring the element 'Magnesium (Mg)' with the atomic number '12'. The background should be a smooth gradient from deep purple to dark violet. In the center of the image, place a large, bold white 'Mg' symbol, styled in a modern sans-serif font. Above the 'Mg' symbol, write in a smaller size the text 'The Longevity' in white, clean sans-serif font. Below 'Mg', add the text 'Mineral Essential.' in the same white font. Behind the 'Mg' symbol, include a 3D crystal formation, rendered in low-poly, light purple hues, slightly transparent. Around the 'Mg' symbol, enclose it with a thin, angular white box frame. Below the 'Mg', also include the electron configuration '[Ne]3s²' in a small, semi-transparent, gray font. Ensure the overall style is modern, minimalistic, and clean with precise geometry, and balance between the text and the graphics. Use scientific and geometric design elements to match the scientific nature of the poster."