Overview
Tourmaline rough refers to uncut, natural crystals of tourmaline, a boron silicate mineral with a complex composition that includes elements like aluminum, iron, and lithium. Its name derives from the Sinhalese word 'turmali,' meaning 'mixed colors,' reflecting its diverse hues. Valued for both aesthetic and industrial uses, tourmaline is classified into varieties like elbaite (green/pink), schorl (black), and rubellite (red). Historically, tourmaline has been mined in Brazil, Afghanistan, and Nigeria. Its unique piezoelectric properties—generating an electric charge under pressure—make it valuable beyond gemology, including in scientific instruments. Buyers should note that quality depends on color saturation, clarity, and crystal integrity.
Physical and Chemical Properties
Tourmaline’s hardness (7–7.5 Mohs) and vitreous luster make it suitable for jewelry, though its brittleness requires careful cutting. It exhibits pleochroism, showing different colors when viewed from various angles. Chemically, it’s inert to most solvents but may lose color under extreme heat or prolonged sunlight. The mineral’s piezoelectricity is leveraged in devices like pressure sensors and air purifiers. Its composition varies widely; for example, iron-rich schorl is opaque, while lithium-rich elbaite is transparent. Density ranges from 2.82–3.32 g/cm³, and crystals often form elongated prisms with striations.
Main Applications
Gemstone cutting is the primary use for high-quality tourmaline rough, especially vivid pinks (rubellite) and neon greens (chrome tourmaline). Lower-grade material is used in metaphysical products or as decorative mineral specimens. Industrially, tourmaline’s piezoelectric properties are exploited in precision instruments. Crushed tourmaline is also added to ceramics and cosmetics for purported negative-ion benefits. In recent years, its use in water filtration systems (via ionization) has grown, though scientific validation remains limited.
Safety and Storage
Tourmaline rough is generally safe to handle but generates dust when cut, requiring respiratory protection. Sharp edges may cause cuts; gloves are recommended during processing. Storage should avoid humidity and direct sunlight to prevent color degradation. For long-term preservation, wrap specimens in acid-free paper and store in padded containers. Dealers often stabilize fractured pieces with epoxy, which buyers should disclose if reselling.
B2B Procurement Guide
When sourcing tourmaline rough, prioritize suppliers with transparent mining practices (e.g., no child labor). Key purchasing criteria include color consistency, minimal internal fractures, and size (larger pieces command premiums). Prices vary by rarity—Paraíba-type (neon blue-green) can exceed $10,000/kg, while common schorl costs under $20/kg. Consider third-party certification for high-value lots. Shipping requires sturdy packaging to prevent chipping; insure shipments exceeding $1,000.
Related Manufacturers
- 主营：氧化铁颜料、石墨粉、硅藻土、电气石原石、二氧化硅、电气石、滑石粉、硅酸铝粉、硅灰石粉
- 主营：硅灰石粉、矿粉、硅灰、长石粉、高岭土、玻璃粉、膨润土、玻璃鳞片、萤石粉
- 主营：石墨、膨胀石墨、导电石墨粉、托玛琳原石、防静电墨粉、阻燃石墨粉、鳞片石墨粉、超细石墨粉、云母、云母片、茶色云母片、云母粉、电气石、电气石粉、电气石颗粒、天然云母片、透明云母片、导热石墨、绝缘云母片、耐高温云母、云母板、岩片、贝壳片、膨润土、钙基膨润土、纳基膨润土
- 主营：火山石、玉米芯、凹凸棒土、砾石、磁粉、滑石粉、硅藻土、贝壳粉、膨润土、珍珠岩、发酵松树皮
- 主营：重晶石粉、膨润土、萤石粉、贝壳彩片、铝矾土粉、孵化蛭石、托玛琳粉、石英砂滤料、精制石英砂、海泡石纤维、造景夜光石、除锈石英砂、超细氧化钙、白色鹅卵石、防沉淀滑石粉、高岭土、夜光石、木粉、莫来砂、麦饭石、沸石、钢结构防火涂料、生物质颗粒、金刚砂、铝矾土
- 主营：滑石粉、金云母、蛭石片、鹅卵石、石英砂、杨木粉、胶粘石、膨润土、蛭石粉、高铝粉、水洗沙、萤石粉、木粉60目、30目漂珠、硅藻土、电气石、孵化蛭石、生物质颗粒、贝壳彩片、氧化铁颜料、生铁粉、高岭土、白云母、沸石、漂珠
- 主营：电气石负氧离子、膨润土、蛭石、碧玺、白沙
- 主营：蛭石、云母、漂珠、硅藻土、膨润土、高岭土、防火涂料、萤石、石英砂、麦饭石、铝矾土、电气石、彩砂、鹅卵石、海泡石、重钙粉、重晶石、木粉、蛭石粉、氧化钙、生物质颗粒、贝壳彩片、莫来砂、蛭石板、沸石粉
- 主营：滑石粉、电气石、石英砂、黑碧玺原石、金刚砂、氧化铁、石墨粉、陶瓷球、膨润土、矿化球、高岭土、硅藻土、云母、氧化铁颜料、托玛琳球、防火涂料、岩片、仿瓷沙、纤维、火山石、铁粉、钙粉、远红外粉、玻璃微珠、夜光石、雨花石
- 主营：滑石粉、硅藻土、重晶石粉、配重铁砂、蛭石粉、萤石粉、重钙粉、氧化钙、麦饭石球、电气石粉、重质碳酸钙、海泡石纤维、莫来砂、膨润土、漂珠、贝壳彩片、云母、石英砂、蛭石、木粉、夜光石、生物质颗粒、铝矾土、粉煤灰漂珠、杨木粉
- 主营：珍珠岩、夜光石、海泡石、黑碧玺、火山石、云母粉、生石灰、彩砂、萤石粉、漂珠、硅藻土、铁粉、石英砂、蛭石、石棉绒、麦饭石球、复合岩片、生物质颗粒、配重铁砂、麦饭石、萤石矿、白沙子、发光石、夜光粉、重晶石粉
- 主营：石英砂、金刚砂、金刚砂地坪材料、白云石、蛭石、云母、轻钙粉、重钙粉、重晶石粉、质感砂、鹅卵石、白沙子、火山石、方解石、高岭土、球场砂、草坪砂、石英砂滤料、滑石粉、膨润土、凹凸棒土、橡胶粉、陶土粉、麦饭石粉、石英粉
- 主营：萤石块、发光石、轻钙粉、蛭石粉、夜光沙、夜光石、云母粉、夜光粉、夜光砖、托玛琳、海泡石、硅藻土、萤石粉、萤石球、滑石粉、石英粉、电气石、蛭石片、氟化钙、彩砂、盐沙、石英砂、漂珠、碳酸钙粉
- 主营：锂辉石、白刚玉、黑碳化硅、绿碳化硅、玻璃轻石、玻璃纤维、玄武岩纤维、氧化锆球
- 主营：电气石、麦饭石、云母粉、碧玺原石、石英砂、高岭土、蛭石、沸石、火山石、岩棉粉、石棉绒、海泡石、滑石粉、膨润土、漂珠、石墨、玻璃砂、硅藻土、岩片、鹅卵石、石墨粉、鳞片石墨、彩色石子、重钙粉、轻钙粉、硅灰