Gemstone profile and identification guide
Pietersite
Pietersite is a brecciated chatoyant quartz aggregate with dramatic directional luster.
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Overview
Pietersite is a brecciated chatoyant quartz aggregate with dramatic directional luster.
Did you know? Pietersite is sometimes called tempest stone due to storm-like visual movement.
Use this profile as a collector reference and educational guide for quick on-page comparison, then validate with the interactive identification system.
Identification
Name: Pietersite
Scientific classification: Silicate (Brecciated Chatoyant Quartz Aggregate Trade Name)
Hardness: 6.5 Mohs
Transparency: opaque
Lustre: silky to vitreous
Crystal system: Trigonal (quartz aggregate context)
Primary colour: Blue
Secondary colour: Gold
Colour family: Blues
Swirling chatoyancy in brecciated texture distinguishes pietersite from tiger eye.
Verification Status
Status: verified-core-fields
Reference priority: GIA, Gem-A, Mindat, International Gem Society
Core identity, locality, and physical-property fields reviewed against standard gemological references.
Trade-name entries include conservative composition and treatment disclosures where needed.
Physical Properties
Hardness category: hard
Hardness value: 6.5 Mohs
Chemical composition: Silicon dioxide (SiO2) with fibrous amphibole-derived chatoyant structures
Crystal system: Trigonal (quartz aggregate context)
Common locations: Namibia, China
Learn more: Gem-A gemstone education resources.
Colour Variations
Brecciated fibrous chatoyant stone with swirling blue-gold-brown flashes.
Optical effects: Chatoyancy
Detailed Gemology
Mineral species: Chatoyant quartz aggregate (pietersite trade material)
Mineral group: Quartz aggregate trade category
Chemical formula: Silicon dioxide (SiO2) with fibrous amphibole-derived chatoyant structures
Mohs hardness: 6.5
Crystal system: Trigonal (quartz aggregate context)
Lustre: silky to vitreous
Transparency: opaque
Streak: White
Cleavage: None (quartz-dominant aggregate)
Fracture: Conchoidal to uneven
Specific gravity: 2.6-2.9 (variable)
Refractive index: Approximately 1.54-1.55 (quartz-dominant)
Optical phenomena: Chatoyancy
Colour range: Blue, gold, brown, red-brown swirls
Common inclusions: Growth features, fractures, and matrix/inclusion structures as applicable
Geological environment: Species-dependent; see formation process
Principal mining regions: Namibia, China
Important commercial sources: Classic pietersite localities are Namibia and China
Historical significance: Recognized in modern gem and mineral trade contexts.
Common treatments: Treatment status varies by product; disclosure recommended.
Synthetic or imitation forms: Imitations may exist depending on material category.
Common look-alikes: Species-dependent look-alikes in trade.
Jewellery uses: Used in cabochons, beads, and statement jewelry.
Care recommendations: Moderately durable; avoid impact and aggressive ultrasonic cleaning.
Cross-check profile data with GIA Gem Encyclopedia and Mindat entry for Pietersite.
Formation
Forms through silicification and brecciation of fibrous precursor materials in host rock.
Origin
Classic pietersite localities are Namibia and China
Uses
Best for: Used in cabochons, beads, and statement jewelry.
Ideal uses: Cabochons highlighting dynamic chatoyant movement.
Care
Moderately durable; avoid impact and aggressive ultrasonic cleaning.
Need another candidate? Use advanced gemstone search or return to the identification guide.
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Pietersite FAQ
How can I identify Pietersite?
Compare hardness (6.5 Mohs), crystal system (Trigonal (quartz aggregate context)), colour profile, and lustre (silky to vitreous) with your sample. Then cross-check related gemstones listed above.
What colour range does Pietersite appear in?
Brecciated fibrous chatoyant stone with swirling blue-gold-brown flashes.
Where is Pietersite commonly used?
Cabochons highlighting dynamic chatoyant movement.. For maintenance, follow the care guidance in this profile.
Scientific References
GIA: general gemstone identity (reviewed) - Batch 07 factual verification pass.
Gem-A: gemological terminology and testing references (reviewed) - Batch 07 factual verification pass.
Mindat: mineral species and principal localities (reviewed) - Batch 07 factual verification pass.
International Gem Society: gem trade context and treatment overview (reviewed) - Batch 07 factual verification pass.