Imogolite
A variety of Minerals
What is Imogolite?
Imogolite is an aluminium silicate clay mineral with the chemical formula Al2SiO3(OH)4. It occurs in soils formed from volcanic ash and was first described in 1962 for an occurrence in Uemura, Kumamoto prefecture, Kyushu Region, Japan. Its name originates from the Japanese word imogo, which refers to the brownish yellow soil derived from volcanic ash. It occurs together with allophane, quartz, cristobalite, gibbsite, vermiculite and limonite. Imogolite consists of a network of nanotubes with an outer diameter of ca. 2 nm and an inner diameter of ca. 1 nm. The tube walls are formed by continuous Al(OH)3 (gibbsite) sheets and orthosilicate anions (O3SiOH groups). Owing to its tubular structure, natural availability, and low toxicity, imogolite has potential applications in polymer composites, fuel gas storage, absorbents, and as a catalyst support in chemical catalysis.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Imogolite 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.
Imogolite Localities Map
See where Imogolite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- White, blue, green, brown, black
- Hardness (Mohs)
- 2 - 3
- Density
- 2.7 g/cm³
Chemical Properties
- Chemical Formula
- Al2SiO3(OH)4
- Elements
- Al, H, O, Si
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Imogolite FAQs
How do I identify Imogolite?
Imogolite can be identified by its hardness of 2 - 3 on the Mohs scale, White color. Look for these key characteristics when examining specimens.
What color is Imogolite?
Imogolite typically appears in White, blue, green, brown, black. Color can vary depending on impurities and formation conditions.
How hard is Imogolite?
Imogolite has a hardness of 2 - 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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