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Material World
Mineral · TiO2

Rutile

The richest natural form of titanium dioxide — the preferred feed for titanium metal and white pigment, and scarce enough that most producers use ilmenite instead.

Ore Pigment

Rutile is titanium dioxide, and it has one of the highest refractive indices of any common mineral — higher than diamond. That is not a curiosity: it is exactly why titanium dioxide is the white pigment in most paint, paper, plastic and sunscreen. A particle that bends light strongly scatters it strongly, and scattering is what whiteness is.

As an ore, rutile is the richest natural titanium feed and therefore the one the chloride process prefers. It is also scarce, which is why most titanium in fact starts as ilmenite and is upgraded.

How to identify it

Rutile is reddish brown to black, with a brilliant adamantine lustre and a distinctly pale streak. Slender crystals are common, and they occur famously as golden needles enclosed in quartz — rutilated quartz, cut as a gemstone for the inclusions rather than despite them.

Extraction

Rutile is recovered from heavy mineral sands rather than from hard rock. Beach and dune deposits concentrate it along with ilmenite and zircon by the same wave and wind sorting that concentrates any dense grain, and the separation is physical — gravity, magnetic and electrostatic — before any chemistry begins.

Medium confidence Weak evidence

How we know: checked recently · only one source, so there is nothing to cross-check it against · stated directly by the source.

How this connects

Where a connection has been confirmed by an outside reference, that reference is named beside it.

is an ore of

  • Titanium — element · the highest-grade natural feed, and the one the chloride route prefers Wikidata

is an input to

  • Kroll process — process · converted to titanium tetrachloride, which is distilled to purity before reduction

is a component of

  • Schist — rock · a common accessory, and in some schists concentrated enough to be a titanium resource in its own right

is an alternative to

  • Ilmenite — mineral · as a titanium feedstock. Rutile is the better feed at around ninety-five per cent titanium dioxide against ilmenite's fifty, and ilmenite supplies most of the world's titanium anyway because there is far more of it

contains

Sources

  • Material World
    Our own writing
  • Wikidata
    Wikimedia Foundation · Creative Commons CC0 1.0 Universal (public domain dedication)

Questions this page answers

Where it comes from, and what it becomes

Follow Rutile back to what it starts as, and forward into what it becomes. Each step is a documented one — a real route material takes, not a chain of inference.

Downstream — what it becomes

  • Rutile → is an input to (converted to titanium tetrachloride, which is distilled to purity before reduction) → Kroll process → produces (as sponge, which must then be crushed, melted and cast before it is usable metal) → Titanium → is a component of (the other half of the strengthening phase) → Nickel superalloy → is associated with (the jet engine created the industry, because no existing material survived the turbine inlet) → The wartime materials programmes complete chain
  • Rutile → is an ore of (the highest-grade natural feed, and the one the chloride route prefers) → Titanium → is a component of (the other half of the strengthening phase) → Nickel superalloy → is associated with (the jet engine created the industry, because no existing material survived the turbine inlet) → The wartime materials programmes complete chain
  • Rutile → is a component of (a common accessory, and in some schists concentrated enough to be a titanium resource in its own right) → Schist → is a source for (the next step up in grade, where mica is consumed and the minerals separate into bands) → Gneiss
  • Rutile → is an ore of (the highest-grade natural feed, and the one the chloride route prefers) → Titanium → is a source for (from the residues of titanium and uranium processing and from bauxite tailings; no deposit is worked for scandium alone) → Scandium → is used as → Alloying
  • Rutile → is an ore of (the highest-grade natural feed, and the one the chloride route prefers) → Titanium → is used as (as titanium dioxide, which consumes more titanium by tonnage than metal production does) → Pigment
  • Rutile → is an ore of (the highest-grade natural feed, and the one the chloride route prefers) → Titanium → is used as (its passive oxide film is why it survives seawater) → Corrosion protection

These are the most distinct paths onward. Rutile ends up in others besides.