Carrollite
A variety of Carrollite Subgroup
What is Carrollite?
Carrollite got its name from where it was discovered - Carroll County in Maryland, USA. The mineral is found in hydrothermal deposits and is often associated with a number of other minerals such as Pyrite, Chalcocite, Chalcopyrite, and many others. The most beautiful of its octahedral crystals come from the mines of the Democratic Republic of Congo.
Uses & Applications
Carrollite can be used as a cobalt ore. Its crystals have a bright, silvery, metallic color and finish which rarely tarnishes, which makes them attractive to, and fairly popular with, mineral collectors.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Carrollite 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.
Carrollite Localities Map
See where Carrollite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Health & Safety Information
- ⚠️Carrollite dust is toxic because it contains heavy metals Copper, Cobalt.
- ⚠️It's advisable to handle carrollite carefully to avoid generating dust and wash hands thoroughly afterward. When cutting or polishing carrollite, wear a dust mask to prevent inhaling heavy metal particles. Store carrollite in a sealed container in a well-ventilated area, away from children and pets. For those involved in crystal healing, never put it in your mouth.
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Quick Facts
Physical Properties
- Color
- Bright silver
- Hardness (Mohs)
- 4.5 - 5.5
- Density
- 4.83 g/cm³
- Streak
- Gray black
- Luster
- Metallic
- Crystal System
- Isometric
Chemical Properties
- Chemical Formula
- Cu(Co,Ni)2S4
- Elements
- Co, Cu, Ni, S
Also Known As
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Carrollite FAQs
How do I identify Carrollite?
Carrollite can be identified by its hardness of 4.5 - 5.5 on the Mohs scale, Bright silver color, Metallic luster, Isometric crystal system. Look for these key characteristics when examining specimens.
What color is Carrollite?
Carrollite typically appears in Bright silver. Color can vary depending on impurities and formation conditions.
How hard is Carrollite?
Carrollite has a hardness of 4.5 - 5.5 on the Mohs scale. This gives it moderate hardness.
