Rutile
Rutile is an oxide mineral prized by collectors for its exceptional color range, with several world-class Chinese localities.
About Rutile
Rutile belongs to the oxide class in the rutile group and has the chemical formula TiO2. It crystallizes in the tetragonal system and is one of the most visually varied minerals in the collector market. Its combination of structural character and global distribution make it a recognized species in both systematic and aesthetic collections.
Identification & care
Rutile typically forms prismatic with vertical striations; twinned 'knee-shaped' twins (geniculated) and cyclic sixling 'wheel' twins; acicular in quartz (sagenite); massive, granular. Its color range is broad, including blood red, brownish yellow, brown-red, yellow, greyish-black, black, brown, and bluish or violet. The luster is adamantine, metallic, the streak is greyish black, pale brown, light yellow, and specimens range from transparent (red), to opaque (black). The cleavage is distinct/good on {110}, imperfect on {100}. The fracture is irregular/uneven, sub-conchoidal, which aids identification.
Collector context
How it forms
Rutile forms in accessory mineral in igneous and metamorphic rocks; pegmatites; hydrothermal veins; beach sand placers (with ilmenite, zircon); inclusions in quartz, garnet, corundum. It is commonly found in association with ilmenite, titanite, quartz (as inclusions), hematite, zircon, brookite, anatase.
Classic Chinese localities
Documented Chinese occurrences are recorded at Shangbao Mine, Jiama Cu-polymetallic deposit and Jinduicheng Mine, among others.
Why collectors care
Collectors pursue Rutile for the clarity of its crystal form and, in good material, saturated color that reads instantly across a display case. A well-terminated rutile on clean matrix photographs well, identifies quickly, and anchors a cabinet piece. Top Chinese specimens over the last two decades have reset the bar for what rutile looks like at collector grade.
What affects value
Value in Rutile is assessed, in typical order of weight, against: (1) locality provenance; (2) size relative to the species norm; (3) crystal form and termination sharpness; (4) color saturation and zoning; (5) transparency and internal clarity; (6) matrix quality and aesthetic balance; (7) condition (absence of damage, chips, or repair). Cleaning quality and verified locality documentation act as multipliers across the above.
Naming history
The name Rutile has a specific etymological and historical context — see Mindat's reference entry for provenance details. We have retained naming data at the record level; published prose is paraphrased from factual fields rather than copied from source.