Gemstone profile and identification guide
Locality plays an important role in how Heliodor is understood in the gem trade. Collectors and lapidaries comparing similar stones often come to it for different reasons, but identification still comes back to blue body colour, 7.5 Mohs hardness, and vitreous lustre. The secondary green note often matters more than people expect when separating it from lookalikes.
Locality plays an important role in how Heliodor is understood in the gem trade. Collectors and lapidaries comparing similar stones often come to it for different reasons, but identification still comes back to blue body colour, 7.5 Mohs hardness, and vitreous lustre. The secondary green note often matters more than people expect when separating it from lookalikes.
Did you know? Heliodor is commonly associated with material from Brazil, though the broader trade may draw on multiple localities.
Use this profile as a collector reference and educational guide for quick on-page comparison, then validate with the interactive identification system.
Name: Heliodor
Scientific classification: Cyclosilicate (Beryl Group)
Hardness: 7.5 Mohs
Transparency: transparent
Lustre: vitreous
Crystal system: Hexagonal
Primary colour: Blue
Secondary colour: Green
Colour family: Blues & Cyans
When separating Heliodor from similar-looking stones, pay attention to the combination of 7.5 Mohs hardness, vitreous lustre, and hexagonal crystal structure. The interaction between blue and green tones is more useful than the primary colour alone when comparing candidates. Useful side-by-side comparisons include Emerald, Aquamarine, Morganite.
Status: verified-family-derived
Reference priority: GIA, Gem-A, Mindat, International Gem Society
Core identity fields inherited from verified parent profile: aquamarine.
Heliodor profile uses beryl species-level core identity fields.
Variety-level locality and treatment specifics can differ and should be reviewed before publication-grade claims.
Hardness category: hard
Hardness value: 7.5 Mohs
Chemical composition: Beryllium aluminum silicate (Be3Al2Si6O18)
Crystal system: Hexagonal
Common locations: Brazil (Minas Gerais), Pakistan (Shigar Valley), Nigeria, Mozambique, Madagascar
Learn more: Gem-A gemstone education resources.
Heliodor sits in the blues & cyans grouping here, usually reading first as blue with green appearing as a secondary note or modifier.
Optical effects: None specified in the current dataset.
Mineral species: Beryl
Mineral group: Beryl group
Chemical formula: Beryllium aluminum silicate (Be3Al2Si6O18)
Mohs hardness: 7.5
Crystal system: Hexagonal
Lustre: vitreous
Transparency: transparent
Streak: White
Cleavage: Indistinct basal cleavage
Fracture: Conchoidal to uneven
Specific gravity: 2.66-2.80
Refractive index: 1.57-1.60
Optical phenomena: None commonly reported
Colour range: Blue, Green
Common inclusions: Two-phase fluid inclusions, growth tubes, feathers, and zoning
Geological environment: Heliodor occurs in Granitic pegmatites and hydrothermal beryllium-bearing veins. Its Hexagonal structure reflects the pressure-temperature conditions of those host rocks, with notable occurrences in Brazil (Minas Gerais), Pakistan (Shigar Valley), Nigeria, Mozambique, Madagascar.
Principal mining regions: Brazil (Minas Gerais), Pakistan (Shigar Valley), Nigeria, Mozambique, Madagascar
Important commercial sources: Brazil remains a leading producer; important modern sources include Pakistan, Nigeria, Mozambique, and Madagascar
Historical significance: Beryl varieties have been used in gems and ornament since antiquity.
Common treatments: Variety-dependent: emerald often clarity-enhanced with oils/resins; aquamarine and morganite are commonly heat treated.
Synthetic or imitation forms: Hydrothermal synthetic emerald and various glass/composite imitations are present in trade.
Common look-alikes: emerald, aquamarine, morganite
Jewellery uses: Heliodor is used chiefly for Best for jewellery and display pieces where colour, pattern, or internal effect matters more than maximum wear resistance.. In the trade it is commonly fashioned as faceted stones, calibrated cuts, and higher-clarity collector pieces, with Mohs hardness 7.5 guiding suitable jewellery applications.
Care recommendations: Heliodor should be cleaned with lukewarm water, mild soap, and a soft brush. At Mohs 7.5 in the Hexagonal system, avoid steam cleaners, harsh chemicals, and high-impact wear. Use only gentle cleaning because treatment residues can be damaged by heat or aggressive chemicals.
Cross-check profile data with GIA Gem Encyclopedia and Mindat entry for Heliodor.
Heliodor is a Beryl material with chemistry Beryllium aluminum silicate (Be3Al2Si6O18). It develops in Granitic pegmatites and hydrothermal beryllium-bearing veins, and economically significant production is associated with Brazil (Minas Gerais), Pakistan (Shigar Valley), Nigeria, Mozambique, Madagascar.
Brazil remains a leading producer; important modern sources include Pakistan, Nigeria, Mozambique, and Madagascar
Best for: Heliodor is used chiefly for Best for jewellery and display pieces where colour, pattern, or internal effect matters more than maximum wear resistance.. In the trade it is commonly fashioned as faceted stones, calibrated cuts, and higher-clarity collector pieces, with Mohs hardness 7.5 guiding suitable jewellery applications.
Ideal uses: Best for jewellery and display pieces where colour, pattern, or internal effect matters more than maximum wear resistance.
Heliodor should be cleaned with lukewarm water, mild soap, and a soft brush. At Mohs 7.5 in the Hexagonal system, avoid steam cleaners, harsh chemicals, and high-impact wear. Use only gentle cleaning because treatment residues can be damaged by heat or aggressive chemicals.
Need another candidate? Use advanced gemstone search or return to the identification guide.
Compare hardness (7.5 Mohs), crystal system (Hexagonal), colour profile, and lustre (vitreous) with your sample. Then cross-check related gemstones listed above.
Heliodor sits in the blues & cyans grouping here, usually reading first as blue with green appearing as a secondary note or modifier.
Best for jewellery and display pieces where colour, pattern, or internal effect matters more than maximum wear resistance.. For maintenance, follow the care guidance in this profile.
GIA: general gemstone identity (reviewed) - Reviewed as a variety profile derived from verified parent gemstone: aquamarine.
Gem-A: gemological education and terminology (reviewed) - Reviewed as a variety profile derived from verified parent gemstone: aquamarine.
Mindat: mineral species and locality index (reviewed) - Reviewed as a variety profile derived from verified parent gemstone: aquamarine.
International Gem Society: collector-facing gem reference (reviewed) - Reviewed as a variety profile derived from verified parent gemstone: aquamarine.
