A striking natural gemstone featuring black rutile threads woven through transparent quartz. This 0.480 ct oval cabochon is polished to a smooth dome, perfect for jewelry creation or mineral collections. Each stone displays its own unique rutile pattern, offering authentic beauty and timeless elegance.
Certificate :CA-QUAR026RB-003-092 Gem Type: Natural Clear Quartz Weight: 0.480 Carat Shape: oval Size: 3.9 x 5.9 x 2.3 mm. Color: clear/black Clarity: Transparent Luster: submetallic Treatment: heated to stabilise materials Optical Phenomenon : rutilated ( black titanium dioxide inclusions trapped during the formation of quartz)
Birefringence : 0.285 to 0.296
System: Tetragonal.
Habit: Prismatic, acicular (needle-like), often elongated parallel to the c-axis.
Symmetry: High symmetry (4/mmm)
Key Features: High refractive index, large birefringence, high dispersion, giving it distinct colors and optical effects.
Formation:Rutile needles grow within or on quartz, often epitaxially, aligning with the quartz's crystal structure to minimize stress.
Patterns:Can form random, parallel, star-shaped (sagenitic), or dense bundles.
Color:Golden, red, silver, black (from rutile), with the quartz usually colorless.
Significance:The interaction of their crystal structures (epitaxy) dictates the beautiful patterns, making it popular for jewelry
Crystallography : Hexagonal (tetragonal) Dispersion : 0.28 (higher then diamond) Luster : Vitreous Hardness : 7 Refractive index : the host quartz, typically around 1.544–1.553, while the rutile inclusions themselves have a very high RI (2.616–2.903), Specific gravity : 2.651
