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.

ระบบผลึก	Trigonal
หมวดหมู่แร่ธาตุ	09 Silicates
ความแข็งโมห์ส	7.0-7.5
ความถ่วงจำเพาะ	2.82-3.32
สี	Black, green, pink, blue, watermelon
ความวาว	Vitreous
สีเส้นขูด	Colorless
การแตกเรียบ	None
รอยแตก	Conchoidal to uneven
ความโปร่งใส	Transparent
ลักษณะผลึก	Prismatic with triangular cross-section