Rutilated Quartz
Quartz var. Rutilated Quartz · Semi-Precious Gemstone and Mineral Specimen
Crystal System
Trigonal crystal system with prismatic habit, commonly showing hexagonal cross-sections and striated prism faces.
Mineral Group
Silicate mineral group, specifically belonging to the tectosilicate subgroup.
Chemical Formula
SiO2 with inclusions of TiO2
Formation Process
Hydrothermal and pegmatitic processes where silicon dioxide-rich fluids crystallize around pre-existing needle-like titanium dioxide (rutile) crystals under high temperature and pressure.
About This Crystal
The specimen displays transparent to translucent quartz host material featuring distinct, golden to reddish-brown needle-like inclusions of rutile forming complex patterns and phantom-like growths within the crystal matrix.
Physical Characteristics
Color ranges from colorless to smoky with golden-yellow or reddish-brown rutile needles; white streak; no cleavage; conchoidal fracture; specific gravity around 2.65; brittle tenacity; vitreous luster.
Optical Properties
Singly refractive or uniaxial positive with a refractive index of 1.544 to 1.553, showing weak birefringence and occasional internal light reflections off the metallic rutile needles.
Hardness & Durability
Origin Region
Notable geographic sources include Brazil, Madagascar, Australia, India, and the United States. It typically forms in pegmatites and hydrothermal veins.
Hardness & Durability
Mohs hardness of 7, making it durable for general jewelry use, though internal fractures containing rutile needles can create points of weakness.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid ultrasonic cleaners and harsh chemicals due to potential stress fractures or inclusions reaching the surface; store separately to prevent scratching.
Rarity & Value
Moderately common to rare depending on the density, clarity, and arrangement of the rutile inclusions; high-grade specimens with clear quartz and dense, golden needles command higher prices.
Special Characteristics
Features prominent needle-like rutile inclusions (often called 'Venus hair stone' or 'Cupid's darts'), creating striking visual patterns and internal light refractions.
Lore & History
Historically associated with vitality and illumination, often referred to in lore as capturing rays of the sun; traditionally used in meditation to cleanse energy fields and promote spiritual growth.