rutile
Definition
Noun: A naturally occurring mineral composed primarily of titanium dioxide (TiO₂) in a specific crystalline structure. It is commonly found in metamorphic and igneous (plutonic) rocks and serves as the most important ore for the industrial production of titanium metal and titanium dioxide pigment.
Usage
Rutile is used as a specific geological and mineralogical term. * It is typically used as a non-count noun when referring to the mineral in general. * It can be used as a count noun when referring to specific crystals or specimens.
Examples
- General Reference: "The beach sands were rich in rutile and other heavy minerals."
- Scientific Context: "Rutile is the most stable polymorph of titanium dioxide under Earth's surface conditions."
- As a Count Noun: "The quartz specimen contained several well-formed rutiles with a characteristic reddish-brown color."
Advanced Usage
- In Geology: Rutile is a common accessory mineral in high-grade metamorphic rocks like eclogite and blueschist, and in igneous rocks such as granite and pegmatite. Its presence is used in geothermobarometry to estimate the temperature and pressure conditions during rock formation.
- In Industry: The term is central to discussions about titanium resources. "Primary rutile" refers to mineral deposits mined directly from hard rock, while "secondary rutile" is recovered from mineral sands.
Variants and Related Words
- Rutile Structure (n): In crystallography, this refers to the specific tetragonal crystal structure adopted by rutile (TiO₂), which is also common to other metal dioxides like stishovite (SiO₂) and cassiterite (SnO₂).
- Rutiliated (adj): Describes a gemstone, most commonly quartz, that contains needle-like inclusions of rutile. These inclusions can create visual effects like asterism (a star pattern) or a hazy, golden appearance.
Synonyms
- Titanium Dioxide Mineral: This is a descriptive synonym, though it is less precise as titanium dioxide also occurs in other mineral forms like anatase and brookite.
Different Meanings
The word "rutile" has no other common meanings outside of its specific use as a mineral name. It is not used in idioms or phrasal verbs.
Noun
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a mineral consisting of titanium dioxide in crystalline form; occurs in metamorphic and plutonic rocks and is a major source of titanium
