Dumortierite Quartz
Quartz var. Dumortierite Quartz · Semi-Precious Gemstone and Mineral Specimen
Crystal System
Trigonal crystal system, typically found as tumbled or massive aggregate in this form.
Mineral Group
Silicates
Chemical Formula
SiO2 with inclusions of Al7BO3(SiO4)3O3
Formation Process
Hydrothermal and metamorphic processes where aluminum borosilicate crystallizes within a quartz host rock.
About This Crystal
A small tumbled stone exhibiting a dark denim-blue to indigo color with characteristic mottled patterns and minor white matrix inclusions, displaying a vitreous to waxy luster.
Physical Characteristics
Color ranges from blue to violet-blue with a white streak, conchoidal fracture, specific gravity around 2.65, and a brittle tenacity.
Optical Properties
Singly or doubly refractive depending on the quartz host, uniaxial positive with low birefringence.
Hardness & Durability
Origin Region
Brazil, Madagascar, Namibia, France, and the USA.
Hardness & Durability
Mohs hardness of 7 for the quartz host, good durability and suitable for everyday jewelry wear.
Care & Maintenance
Clean with warm soapy water using a soft brush, store away from direct sunlight and harder minerals, avoid harsh chemicals.
Rarity & Value
Common to uncommon, value depends on color intensity and lack of matrix blemishes, typically very affordable.
Special Characteristics
Distinctive denim-blue inclusions inside a clear or milky quartz matrix.
Lore & History
Often regarded as a stone of patience and mental discipline in crystal healing, traditionally associated with the throat and third eye chakras.