Trogtalite
A variety of Minerals
What is Trogtalite?
Trogtalite is a rare selenide mineral with the formula CoSe2. It crystallizes in the cubic system and is part of the pyrite group, consisting of Co and Se2 ions. It has a rose-violet colour and its crystals are opaque. It often occurs as grains. It was thought to be dimorphous with hastite, but this was discredited in 2009. Hastite turned out to be the iron selenide mineral ferroselite. It forms a solid solution series with krut'aite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Trogtalite 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.
Trogtalite Localities Map
See where Trogtalite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Formation of Trogtalite
Trogtalite was first found in 1955 in Trogtal quarry, Lautenthal, Harz Mountains, Germany, after which it was also named. It often occurs intergrown with clausthalite grains at this locality. It has also been found in the Musonoi Cu–Co mine, Kolwezi, Katanga Province, Congo and in Argentina, in Tuminico, Sierra de Cacho, and in Los Llantenes, La Rioja Province. It is often found together with clausthalite, ferroselite, bornhardtite, native selenium, gold, and oosterboschite.
Quick Facts
Physical Properties
- Color
- Rose-violet
- Hardness (Mohs)
- 7
- Density
- 7.09 g/cm³
Chemical Properties
- Chemical Formula
- CoSe2
- Elements
- Co, Se
Identify Trogtalite Instantly
- Snap a photo, get instant results
- 6,700+ rocks, minerals & crystals
- Discover collecting spots near you
Trogtalite FAQs
How do I identify Trogtalite?
Trogtalite can be identified by its hardness of 7 on the Mohs scale, Rose-violet color. Look for these key characteristics when examining specimens.
What color is Trogtalite?
Trogtalite typically appears in Rose-violet. Color can vary depending on impurities and formation conditions.
How hard is Trogtalite?
Trogtalite has a hardness of 7 on the Mohs scale. This makes it a relatively hard mineral suitable for jewelry.
What is the formation of trogtalite of Trogtalite?
Trogtalite was first found in 1955 in Trogtal quarry, Lautenthal, Harz Mountains, Germany, after which it was also named. It often occurs intergrown with clausthalite grains at this locality. It has also been found in the Musonoi Cu–Co mine, Kolwezi, Katanga Province, Congo and in Argentina, in Tuminico, Sierra de Cacho, and in Los Llantenes, La Rioja Province. It is often found together with clausthalite, ferroselite, bornhardtite, native selenium, gold, and oosterboschite.
%252FAbenakiite-(ce)-01.jpg&size=small)
