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Tourmalien rough stones

Property Specification
Chemical Formula (Na, Ca)(Al, Fe, Mg, Li)3(Al, Cr, V)6(Si6O18)(BO3)3(OH)4
Color Ranges from pink, green, blue, to multi-colored (bicolored, tricolored)
Crystal System Hexagonal (Trigonal)
Hardness 7 to 7.5 on the Mohs scale
Specific Gravity 3.06 to 3.24
Refractive Index 1.62 to 1.64
Density 2.9 to 3.2 g/cm³
Cleavage None (fracture is irregular or conchoidal)
Transparency Transparent to opaque
Luster Vitreous (glassy) to sub-adamantine
Fracture Uneven or conchoidal
Occurrence Found in metamorphic rocks, granites, and pegmatites
Inclusions Often contains inclusions like rutile, gas bubbles, or minerals
Common Shapes Rough chunks, elongated crystals, or irregular fragments
Size Varies from small grains to large boulders
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