metamorphic
Blue Quartz (Blue Aventurine)
Silicon Dioxide (SiO2) with inclusions of Dumortierite or Crocidolite
Hardness: 7 (Mohs scale); Color: Pale to deep blue, grayish-blue; Luster: Vitreous to dull; Crystal Structure: Trigonal (often massive); Specific Gravity: 2.63 - 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Pale to deep blue, grayish-blue
- Luster
- Vitreous to dull
Identified More metamorphic →
Explore Blue Quartz (Blue Aventurine) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 7 (Mohs scale); Color: Pale to deep blue, grayish-blue; Luster: Vitreous to dull; Crystal Structure: Trigonal (often massive); Specific Gravity: 2.63 - 2.65
Formation & geological history
Formed through the metamorphism of quartz-rich sediments. The blue color is typically caused by inclusions of fibrous blue minerals like dumortierite that crystallized during or after the formation of the quartz.
Uses & applications
Used primarily for ornamental purposes, lapidary work (cabochons, beads), and as a collector's specimen for its aesthetic blue hue.
Geological facts
Unlike many other blue gemstones, the color in blue quartz is usually structural or caused by inclusions rather than trace elements in the chemical lattice. It is sometimes called 'denim stone' due to its color.
Field identification & locations
Identified by its conchoidal fracture and lack of cleavage. It is distinguishes from sodalite or lapis lazuli by its significantly higher hardness (sodalite is 5.5-6). Commonly found in Brazil, India, and parts of the United States.
More like this
