Drysdallite
A variety of Minerals
What is Drysdallite?
Drysdallite is a rare molybdenum selenium sulfide mineral with formula Mo(Se,S)2. It crystallizes in the hexagonal system as small pyramidal crystals or in cleavable masses. It is an opaque metallic mineral with a Mohs hardness of 1 to 1.5 and a specific gravity of 6.25. Like molybdenite it is pliable with perfect cleavage. It was first described in 1973 for an occurrence in an oxidized uranium deposit near Solwezi, Zambia. It was named for Alan Roy Drysdall, the director of the Zambian geological survey.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Drysdallite 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.
Drysdallite Localities Map
See where Drysdallite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
More Images
Quick Facts
Physical Properties
- Color
- Grayish black with a brown tint
- Hardness (Mohs)
- 2
- Density
- 6.248 g/cm³
- Streak
- Brownish black
Chemical Properties
- Chemical Formula
- MoSe2
- Elements
- Mo, Se
Identify Drysdallite Instantly
- Snap a photo, get instant results
- 6,700+ rocks, minerals & crystals
- Discover collecting spots near you
Drysdallite FAQs
How do I identify Drysdallite?
Drysdallite can be identified by its hardness of 2 on the Mohs scale, Grayish black with a brown tint color. Look for these key characteristics when examining specimens.
What color is Drysdallite?
Drysdallite typically appears in Grayish black with a brown tint. Color can vary depending on impurities and formation conditions.
How hard is Drysdallite?
Drysdallite has a hardness of 2 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
%252FAbenakiite-(ce)-01.jpg&size=small)
