Tourmaline

Complex borosilicate

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Tourmaline is a group of complex borosilicate minerals famous for their wide range of colors. Watermelon tourmaline shows pink centers with green rims. The most common variety, schorl (black), accounts for 95% of all tourmaline.

Hệ tinh thể	Trigonal
Phân loại khoáng vật	09 Silicates
Độ cứng Mohs	7.0-7.5
Tỷ trọng	2.82-3.32
Màu sắc	Black, green, pink, blue, watermelon
Ánh	Vitreous
Màu vệt	Colorless
Cát khai	None
Vết vỡ	Conchoidal to uneven
Độ trong suốt	Transparent
Dạng tinh thể	Prismatic with triangular cross-section