Black Rutilated Quartz
Quartz var. Black Rutilated Quartz · Semi-Precious Gemstone and Decorative Stone
Crystal System
Trigonal, typically forming prismatic crystals with hexagonal cross-sections
Mineral Group
Silicates, specifically Tectosilicates
Chemical Formula
SiO2 with inclusions of TiO2 (Rutile) and sometimes Tourmaline or Actinolite
Formation Process
Hydrothermal and magmatic crystallization within pegmatites, where host quartz crystals grow around pre-existing needle-like inclusion minerals
About This Crystal
The specimen is a beaded bracelet consisting of polished, spherical beads made of translucent to transparent quartz filled with distinct black needle-like or hair-like inclusions. The beads display a vitreous luster and characteristic web-like patterns of dark inclusions inside the clear host matrix.
Physical Characteristics
Body color is clear/transparent with black needle inclusions; white streak; no cleavage; conchoidal fracture; specific gravity approximately 2.65; brittle tenacity; exhibits piezoelectricity and pyroelectricity
Optical Properties
Singly refractive or uniaxial positive with low birefringence (0.009), transparent to translucent clarity, vitreous luster, and no notable pleochroism in the host quartz
Hardness & Durability
Origin Region
Brazil, Madagascar, Australia, India, and the USA; typically forms in pegmatites and hydrothermal veins
Hardness & Durability
Mohs hardness of 7 for the quartz host, making it durable for daily jewelry wear, though the inclusion needles can sometimes create minor structural weaknesses if heavily saturated
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid harsh chemicals and ultrasonic cleaners if fractures are present; store separately from harder gemstones to prevent scratching
Rarity & Value
Uncommon to Moderately Rare; value depends on the clarity of the quartz host and the density, distribution, and contrast of the black needles; generally affordable to moderately priced in bead form
Special Characteristics
Notable for its inclusions, featuring striking dark acicular crystal needles suspended in transparent quartz, sometimes exhibiting slight chatoyancy depending on the alignment of the needles
Lore & History
Historically regarded as a stone of energetic cleansing, grounding, and spiritual growth. In modern metaphysical practices, black rutilated quartz is associated with the root chakra, believed to dispel negative energy and integrate spiritual energy into the physical body