$125Median
5Sold (12 mo)
$2,300Last sale
Ajoite specimens for sale
10 for sale · $100–$9,500 USD
70 in the gallery
Ajoite is a hydrated copper aluminum silicate that forms as soft, often tabular crystals and aggregates. Its color range includes orange to greenish-blue hues, and specimens commonly exhibit a vitreous to silky luster with delicate lath-like or acicular habits that can create striking, flower-like clusters. The mineral is usually associated with secondary copper minerals in hydrothermal or alteration environments and can appear in botryoidal or radiating aggregates, sometimes with inclusions that contribute to its vivid tones.
- Formula
- (K,Na)Cu7AlSi9O24(OH)6 · 3H2O
- Rarity
- Rare
- Stability
- Moderately Stable
- Collector interest
- Very High Interest
- Classification notes
- Silicate, hydrated Cu-Al phyllosilicate
Key characteristics
- Crystal system
- triclinic
- Mohs hardness
- 3.5
- Specific gravity
- 2.8–2.96
- Luster
- vitreous, silky
- Transparency
- transparent, translucent
- Color
- blue, green
- Streak
- white, green
- Cleavage
- perfect
- Fracture
- uneven
- Crystal habit
- acicular, fibrous, radiating, massive
- Classic / historic
Buy Ajoite specimens
View all 10Where Ajoite is found
Top localities
- Messina Mine37 specimens
- Artonvilla Mine8 specimens
- New Cornelia Mine5 specimens
- Aghbar Mine1 specimen
About Ajoite
Notable specimens come from diverse localities, including historic collections from South Africa and occurrences in the United States, with other important sites across southern Africa where hydrothermal processes promoted ajoite formation. Collectors value ajoite for its bold color contrasts, distinctive crystal forms, and the way it can accompany other secondary copper minerals in quartz-rich matrices. Although not among the most common minerals, well-crystallized ajoite crystals and well-preserved clusters offer attractive display pieces and educational specimens that highlight secondary mineralogy and silicate chemistry.
