Red Agate
Quartz var. Chalcedony · Semi-Precious Gemstone / Ornamental Stone
Crystal System
Trigonal, microcrystalline crypto-crystalline habit
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2
Formation Process
Hydrothermal and secondary deposition, typically forming in cavities of volcanic and metamorphic rocks from silica-rich groundwater solutions.
About This Crystal
The image shows a beaded stretch bracelet consisting of spherical, polished beads with a vibrant, translucent cherry-red to deep pinkish-red coloration. The beads display a smooth surface with a vitreous to waxy luster and subtle internal cloudiness characteristic of dyed or treated chalcedony.
Physical Characteristics
Color: Cherry red (often dyed). Streak: White. Cleavage: None. Fracture: Conchoideal to uneven. Specific Gravity: 2.60 to 2.65. Tenacity: Tough and brittle.
Optical Properties
Refractive Index: 1.544 to 1.553. Birefringence: Weak (0.004 to 0.009). Doubly refractive. Translucency ranges from translucent to semi-opaque.
Hardness & Durability
Origin Region
Brazil, India, Madagascar, Uruguay, United States
Hardness & Durability
Mohs hardness of 6.5 to 7. Excellent durability for everyday jewelry use such as bracelets and necklaces due to its microcrystalline toughness.
Care & Maintenance
Clean with warm soapy water and a soft cloth. Avoid harsh chemical cleaners, prolonged direct sunlight to prevent fading, and ultrasonic cleaners if dye stabilization is present.
Rarity & Value
Common. Readily available and affordable. Enhanced treatments like dyeing are extremely common to achieve bright uniform red colors in commercial jewelry.
Special Characteristics
Often exhibits subtle internal color banding or cloudiness; heavily marketed for its vibrant uniform color achieved through modern dye enhancements.
Lore & History
Historically used as an amulet for protection, courage, and vitality in ancient civilizations. In contemporary crystal healing, it is associated with the root chakra, promoting grounding, emotional stability, and life force energy.