Tumbled Milky Quartz
Quartz var. Milky Quartz · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal, presented as a tumbled, rounded pebble with no original crystal faces visible
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2
Formation Process
Forms hydrothermally from silica-rich aqueous solutions in veins, pegmatities, and cavities at varying temperatures and pressures.
About This Crystal
A small, tumbled, smooth pebble with an opaque to translucent milky-white appearance and a vitreous to waxy luster. Internal microscopic fluid inclusions cause the milky, cloudy white color.
Physical Characteristics
Color is milky white to grayish-white with a white streak. It has no true cleavage, exhibits a conchoidal fracture, and a specific gravity of approximately 2.65.
Optical Properties
Singly or doubly refractive depending on angle, uniaxial positive with a refractive index around 1.544-1.553. No significant pleochroism.
Hardness & Durability
Origin Region
Worldwide distribution; major deposits in Brazil, Madagascar, USA, and the Alps. Forms in diverse geological environments.
Hardness & Durability
Mohs hardness of 7. Highly durable with good wearability for jewelry, though internal fractures from tumbling may create weak points.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid harsh chemicals and prolonged direct sunlight, though milky quartz is relatively stable.
Rarity & Value
Very common and inexpensive. Valued mainly for ornamental or metaphysical purposes rather than high commercial gem value.
Special Characteristics
Displays a cloudy milkiness caused by millions of microscopic liquid or gas inclusions trapped during crystal growth.
Lore & History
Often regarded in metaphysical traditions as a stone of purification, clarity, and calming energy, associated historically with emotional balance and mental focus.