Welcome To Ashstone Exports LTD

  • Nigeria

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Welcome to Ashstone Exports LTD

At Ashstone Exports Ltd, we are committed to sustainability, ethical sourcing, and long-term growth. We exist to unlock Nigeria’s economic potential and deliver value to partners across continents. Our story is one of quality, integrity, and ambition—driven by a belief that Africa’s resources can fuel global industries.

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  • House 2 Amasom 18 Bishop Edward Benson street Ogudu GRA phase 2

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Topaz

Ashstone Exports Ltd

Topaz

Property Specification
Chemical Formula Al₂SiO₄(F,OH)₂
Crystal System Orthorhombic
Crystal Habit Prismatic crystals, often with striations
Color Colorless, yellow, blue, pink, brown, green, orange, red
Luster Vitreous
Transparency Transparent to translucent
Hardness (Mohs) 8
Specific Gravity 3.4 to 3.6
Cleavage Perfect basal cleavage
Fracture Subconchoidal to uneven
Streak White
Refractive Index 1.609 to 1.643
Birefringence 0.008 to 0.010
Pleochroism Weak to moderate (varies by color)
Tenacity Brittle
Magnetism Non-magnetic