Gemstone profile and identification guide

Harlequin Quartz

Harlequin quartz is a trade name used for quartz with vivid internal red/orange inclusion patterning.

7 Mohs Clear, Red Inclusion Silicate (Quartz Inclusion Variety, Trade Descriptor)

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Overview

Harlequin quartz is a trade name used for quartz with vivid internal red/orange inclusion patterning.

Did you know? Harlequin usage in quartz trade is descriptive and not a strict mineral species term.

Use this profile as a collector reference and educational guide for quick on-page comparison, then validate with the interactive identification system.

Identification

Name: Harlequin Quartz

Scientific classification: Silicate (Quartz Inclusion Variety, Trade Descriptor)

Hardness: 7 Mohs

Transparency: transparent

Lustre: vitreous

Crystal system: Trigonal

Primary colour: Clear

Secondary colour: Red Inclusion

Colour family: Whites & Neutrals

Quartz constants with distinct internal red inclusion patterns are key indicators.

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/treatment disclosures where needed.

Physical Properties

Hardness category: hard

Hardness value: 7 Mohs

Chemical composition: Silicon dioxide (SiO2) with hematite/iron-oxide inclusions

Crystal system: Trigonal

Common locations: Brazil, Madagascar, Mexico

Learn more: Gem-A gemstone education resources.

Colour Variations

Quartz containing red to orange inclusion patterns sold under harlequin descriptor.

Optical effects: Inclusion Pattern Effect

Detailed Gemology

Mineral species: Quartz with iron-rich inclusions

Mineral group: Quartz group

Chemical formula: Silicon dioxide (SiO2) with hematite/iron-oxide inclusions

Mohs hardness: 7

Crystal system: Trigonal

Lustre: vitreous

Transparency: transparent

Streak: White

Cleavage: None

Fracture: Conchoidal

Specific gravity: 2.65

Refractive index: 1.544-1.553

Optical phenomena: Inclusion-driven visual effects

Colour range: Colorless host with red/orange inclusion zones

Common inclusions: Hematite, iron oxides, fluid inclusions

Geological environment: Hydrothermal quartz systems

Principal mining regions: Brazil, Madagascar, Mexico

Important commercial sources: Harlequin quartz is a trade descriptor typically applied to included quartz from major quartz sources

Historical significance: Modern trade descriptor in included-quartz niche markets.

Common treatments: Color enhancement and imitation products can occur.

Synthetic or imitation forms: Inclusion-simulated glass and composites exist.

Common look-alikes: Fire quartz, strawberry quartz, dyed glass

Jewellery uses: Used in faceted collector stones and decorative cabochons.

Care recommendations: Quartz is durable; avoid impact on included fracture-prone stones.

Cross-check profile data with GIA Gem Encyclopedia and Mindat entry for Harlequin Quartz.

Formation

Forms as quartz traps iron-rich inclusions during growth phases.

Origin

Harlequin quartz is a trade descriptor typically applied to included quartz from major quartz sources

Uses

Best for: Used in faceted collector stones and decorative cabochons.

Ideal uses: Collector stones highlighting inclusion aesthetics.

Care

Quartz is durable; avoid impact on included fracture-prone stones.

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