Amethyst
Quartz var. Amethyst · Semi-Precious Gemstone and Mineral Specimen
Crystal System
Trigonal, typically forming prismatic crystals terminating in rhombohedrons
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2
Formation Process
Hydrothermal and magmatic processes, commonly crystallizing in cavities of volcanic rocks (geodes)
About This Crystal
Displays a distinct purple coloration ranging from light lilac to deep violet, with translucent to transparent clarity and a vitreous luster
Physical Characteristics
Purple body color, white streak, conchoidal fracture, lack of distinct cleavage, specific gravity of approximately 2.65, brittle tenacity
Optical Properties
Uniaxial positive optical character, doubly refractive with weak birefringence and faint pleochroism in shades of purple
Hardness & Durability
Origin Region
Found globally with notable deposits in Brazil, Uruguay, Madagascar, and Zambia
Hardness & Durability
Mohs hardness of 7, making it durable enough for various types of jewelry with good wearability
Care & Maintenance
Clean with warm soapy water using a soft brush, avoid prolonged direct sunlight to prevent color fading, and store separately from harder gems
Rarity & Value
Common to moderately rare depending on saturation and clarity, with prices varying based on intense color and lack of inclusions
Special Characteristics
May exhibit color zoning, phantom growth layers, and piezoelectric properties
Lore & History
Historically associated with royalty, sobriety, and calmness in ancient cultures, frequently used in crystal healing for the third eye and crown chakras