Amethyst Crystal Clusters Types Of Bearings Uses Working Mechanisms Explained. Amethyst, the stone of healing and transformation, will create a peaceful and positive atmosphere. Striking, all natural amethyst pieces may vary in size, shape, and color due to each pieces unique, natural formation. Color ranges from light purple to dark purple, gray, and green. Some clusters include traces of powerful sought after minerals like calcite and cacoxenite. Calcite appears as white crystals or flower petal shaped specks. This mineral symbolizes cleansing. Cacoxenite appears in golden, earthy brown spots. It encourages a focus on positivity and raising energy vibrations. Measures: 3 4"