Rutile Topaz

Mineral group: Silicate
Chemistry: Al2[SiO4](F,OH) 2
Color: White Colorless with needles mostly black golden or brown
Crystal system: Orthorhombic
Fracture: Conchoidal, uneven
Mohs Scale hardness: 8
Refractive index: 1,610-1,638
Dispersion: 0,014
Birefringence: +0,008-0,010
Pleochroism Present: Weak in thick sections
Streak: -
Specific gravity: 3,53- 3,56

Other:
Topaz very rarely occurs with rutile as inclusion. In compare the same form of quarts is far more common, so called Rutile Quarts.