Features 1、This crystal is made of natural crystal stone, creative shape, is a perfect craft decoration 2、An ideal decoration for hydroponic plant : you can place it in potted plants, make the pot unique 3、Used in fish tank : place it in the tank, not only enjoyable, but also to maintain water quality magnetization clean, let the fish healthy growth 4、Good jewelry making material, you can DIY necklace or bracelet or ring you like by polishing the stone 5、Will be a good healing stone for meditation Specification Descriptions: The electrical stone is also called tomalin, "tourmaline", the chemical composition is complex, it is a kind of silicate mineral containing boron, including aluminum, sodium, iron, magnesium and lithium. this stone is made of natural tourmaline rough rock, irregular shape is a perfect craft decoration. You can use it to decorate hydroponic plant and fish tank,and can used for purifying water, for sauna, for Buddha, for feng shui, raising flowers and grass, etc Features: This stone is made of natural tourmaline rough rock, irregular shape is a perfect craft decoration. An ideal decoration for hydroponic plant : you can place it in potted plants, make the pot unique. Used in fish tank : place it in the tank, not only enjoyable, but also to maintain water quality magnetization clean, let the fish healthy growth. Good jewelry making material, you can DIY necklace or bracelet or ring you like by polishing the stone. Will be a good healing stone for meditation. The magnetic field of the black tourmaline also protects against the symptoms of modern social electromagnetic waves, such as restlessness and sleeplessness, while helping to immunize the wearer against harmful radiation. Specifications: Material: natural tourmaline stone Color: black Shape:as the picture Length: 5-7cm/1.96-2.75inch Weight: approx.100g Package Included: 1 pcs x tourmaline stone Note: 1. The total weight error is ±10g 2. Natural mineral product, different sizes, colors and patterns are natural phenomena, and each product can't be exactly the same!