Adamsite
A variety of Muscovite
What is Adamsite?
Adamsite or DM is an organic compound; technically, an arsenical diphenylaminechlorarsine, that can be used as a riot control agent. DM belongs to the group of chemical warfare agents known as vomiting agents or sneeze gases. First synthesized in Germany by Heinrich Otto Wieland in 1915, it was independently developed by the US chemist Roger Adams (for whom it is named) at the University of Illinois in 1918.
Healing Properties
Adamsite is believed to help reveal a person's true self, allowing them to open their heart to a deeper love and understanding of others. Often used on the Third Eye and Crown chakra, it is said to help a person with everyday decision making and living a purposeful life. The vibrations from the stone are believed to open channels between a person and their spirit guide.
Optical Properties
- Refractive Index
- 1.552-1.618
- Pleochroism
- Weak
- Optical Character
- Biaxial negative
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Adamsite 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.
Where to Find Adamsite
Adamsite is a variety of Muscovite. RockHoundR, the free-to-download rockhounding map from the Ruby Glint team, shows where collectors find muscovite in the US, with land-access notes for BLM land and national forests. Collecting is banned in national parks.
See where to find muscoviteAlways check the local rules and get the landowner's permission before you collect.
Key Characteristics
Composition of Adamsite
DM is an odourless crystalline compound with a very low vapour pressure. The colour of the crystals ranges from bright yellow to dark green depending on the purity. It is readily soluble in some organic solvents (e.g., acetone, dichloromethane), but nearly insoluble in water. In vaporous form it appears as a canary yellow smoke.
Quick Facts
Physical Properties
- Streak
- White
Chemical Properties
- Chemical Formula
- KAl2(AlSi3O10)(OH)2
- Elements
- Al, H, K, O, Si
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Adamsite FAQs
What is the composition of adamsite of Adamsite?
DM is an odourless crystalline compound with a very low vapour pressure. The colour of the crystals ranges from bright yellow to dark green depending on the purity. It is readily soluble in some organic solvents (e.g., acetone, dichloromethane), but nearly insoluble in water. In vaporous form it appears as a canary yellow smoke.
