Orpiment
A variety of Minerals
What is Orpiment?
Orpiment is a fairly rare mineral that usually bears a striking golden or yellow-orange hue. Historically, this arsenic-containing mineral was used until the 19th century when it was replaced by less-toxic options. Specimens of orpiment with large, striking crystals may be sought out by collectors. The mineral is also used today in the production of semiconductors and photoconductors.
Etymology & Origins
Orpiment takes its name from the Latin auripigmentum (aurum, "gold" + pigmentum, "pigment") because of its deep-yellow color.
Uses & Applications
Orpiment has a myriad of historical uses, ranging from poison to pigment. Today it is still a major source of arsenic, and it is also used to manufacture oil cloth. Orpiment is also commonly used to create semiconductors and photoconductors.
Healing Properties
Orpiment is believed to stimulate the mind and allow one to become more attuned to their own personal desires. When used on the solar plexus chakra, it is said to increase people's energy levels, allowing them to focus on the things most important to them while promoting a clearer perception of the people and circumstances in their daily life. Because of possible toxins associated with this stone, handwashing is recommended after handling.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Orpiment 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.
Orpiment Localities Map
See where Orpiment is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Associated Chakras
Key Characteristics
Characteristics of Orpiment
Orpiment is a common monoclinic arsenic sulfide mineral. It has a Mohs hardness of 1.5 to 2 and a specific gravity of 3.49. It melts at 300 °C (570 °F) to 325 °C (620 °F). Optically, it is biaxial (−) with refractive indices of a = 2.4, b = 2.81, g = 3.02.
Health & Safety Information
- ⚠️Orpiment dust is toxic because it contains heavy metals Arsenic.
- ⚠️It's advisable to handle orpiment carefully to avoid generating dust and wash hands thoroughly afterward. When cutting or polishing orpiment, wear a dust mask to prevent inhaling heavy metal particles. Store orpiment 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
- Orange-yellow to lemon-yellow
- Hardness (Mohs)
- 1.5 - 2
- Density
- 3.48 g/cm³
- Streak
- Light lemon yellow
- Luster
- Pearly
- Crystal System
- Monoclinic
Chemical Properties
- Chemical Formula
- As2S3
- Elements
- As, S
Also Known As
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Orpiment FAQs
How do I identify Orpiment?
Orpiment can be identified by its hardness of 1.5 - 2 on the Mohs scale, Orange-yellow to lemon-yellow color, Pearly luster, Monoclinic crystal system. Look for these key characteristics when examining specimens.
What color is Orpiment?
Orpiment typically appears in Orange-yellow to lemon-yellow. Color can vary depending on impurities and formation conditions.
How hard is Orpiment?
Orpiment has a hardness of 1.5 - 2 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
What is the characteristics of orpiment of Orpiment?
Orpiment is a common monoclinic arsenic sulfide mineral. It has a Mohs hardness of 1.5 to 2 and a specific gravity of 3.49. It melts at 300 °C (570 °F) to 325 °C (620 °F). Optically, it is biaxial (−) with refractive indices of a = 2.4, b = 2.81, g = 3.02.
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