Trachyte
A variety of Igneous
What is Trachyte?
Trachyte is a volcanic rock that is primarily composed of alkali feldspar. This attractive mineral is commonly used in stone buildings, all the way back to ancient Rome. Several prominent natural features, including Mount Kilimanjaro, are also predominantly composed of trachyte.
Uses & Applications
When polished, trachyte is often used as a decorative construction material, often as flooring or countertops or even tombstones. It is also suitable for constructing walls and can be found as the foundational stone for many houses. This attractive stone may also be carved for use in statues and monuments.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Trachyte before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Trachyte Localities Map
See where Trachyte is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Geochemistry
Chemically, trachyte contains 60 to 65% silica content; less SiO2 than rhyolite and more (Na2O plus K2O) than dacite. These chemical differences are consistent with the position of trachyte in the TAS classification, and they account for the feldspar-rich mineralogy of the rock type.
Key Characteristics
Composition of Trachyte
Trachyte has a silica content of 60 to 65% and an alkali oxide content of over 7%. This gives it less SiO2 than rhyolite and more (Na2O plus K2O) than dacite.
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Quick Facts
Physical Properties
- Color
- Variable, often light colored
- Hardness (Mohs)
- 6
- Density
- 2.43 - 2.45 g/cm³
Chemical Properties
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Trachyte FAQs
How do I identify Trachyte?
Trachyte can be identified by its hardness of 6 on the Mohs scale, Variable color. Look for these key characteristics when examining specimens.
What color is Trachyte?
Trachyte typically appears in Variable, often light colored. Color can vary depending on impurities and formation conditions.
How hard is Trachyte?
Trachyte has a hardness of 6 on the Mohs scale. This gives it moderate hardness.
What is the composition of trachyte of Trachyte?
Trachyte has a silica content of 60 to 65% and an alkali oxide content of over 7%. This gives it less SiO2 than rhyolite and more (Na2O plus K2O) than dacite.
