Dumortierite Quartz
Quartz var. Dumortierite-bearing Quartz · Mineral Specimen
Crystal System
Trigonal, prismatic crystals often massive or fibrous
Mineral Group
Silicates
Chemical Formula
SiO2 (with inclusions of Al7BO3(SiO4)3O3)
Formation Process
Hydrothermal and metamorphic processes involving aluminum-rich rocks
About This Crystal
An opaque to translucent rough mineral specimen displaying characteristic fibrous blue to brownish-blue streaks and inclusions running through a quartz matrix, showing a dull to vitreous luster.
Physical Characteristics
Color ranges from denim blue, indigo, to brownish-grey; white streak; Mohs hardness 7 for the host quartz; uneven to conchoidal fracture; specific gravity around 2.65.
Optical Properties
Uniaxial positive with low birefringence; doubly refractive; no strong pleochroism visible in the massive matrix.
Hardness & Durability
Origin Region
Brazil, Madagascar, Namibia, USA
Hardness & Durability
Hardness of 7 on the Mohs scale, making it durable for general handling and jewelry use, though included zones can be somewhat brittle.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid harsh chemicals and ultrasonic cleaners if fracturing is present.
Rarity & Value
Uncommon to rare depending on the intensity and coverage of the blue dumortierite inclusions; valued by collectors and lapidary artists.
Special Characteristics
Distinctive fibrous or needle-like inclusions of dumortierite trapped within a quartz host, creating a striking blue-and-brown banded appearance.
Lore & History
Often associated with enhancing mental discipline, patience, and organizational skills in modern crystal healing traditions, linked primarily to the throat and third eye chakras.