Curved or angular concentric banding in translucent white, gray, amber, red, and blue-gray tones, as well as dendritic...
Chemical formula
SiO₂ (Microcrystalline fibrous silica with trace iron/manganese oxides)
Chalcedony / Microcrystalline Quartz • Quartz (Chalcedony Aggregate)
Carnelian
Translucent warm orange, fiery sunset red, to brownish-red (sard).
SiO₂ + Fe₂O₃ (Hematite/Iron Oxide sub-microscopic inclusions)Mohs 6.5 – 7.0 Mohs
Mineralogical & Gemological Profile
| Mineral Family | Chalcedony / Microcrystalline Quartz |
|---|---|
| Mineral Species | Quartz (Chalcedony Aggregate) |
| Gemological Variety | Carnelian |
| Chemical Composition | SiO₂ + Fe₂O₃ (Hematite/Iron Oxide sub-microscopic inclusions) |
| Crystal System | Trigonal (Microcrystalline aggregate) |
| Mohs Hardness | 6.5 – 7.0 Mohs |
| Specific Gravity | 2.58 – 2.64 |
| Refractive Index | 1.530 – 1.540 |
Color Characteristics & Optical Behavior
Translucent warm orange, fiery sunset red, to brownish-red (sard).
Geological Context & Pakistani / Global Localities
Found in weathered volcanic nodules across South Asia (historically Gujarat and Indus Valley routes), Yemen, and Brazil.
Collector Interest & Rarity Factors
Richly translucent orange-red carnelian with warm glow in transmitted light.
Fine Jewelry Applications
Traditional silver and gold signet rings, carved seals, beads, and cabochons.
Treatment Considerations & Disclosure
Gentle heating in sunlight or kilns converts iron hydroxides into red hematite—a traditional craft practiced since the Indus Valley Civilization (Harappa/Mohenjo-daro). Dyed imitations are disclosed.
Care & Cleaning Instructions
Wash with warm water and mild soap; dry with a soft cloth.
Traditional Meaning
Traditional Symbolism & Cultural Heritage
Used for over 4,500 years in the Indus Valley and across the Islamic world for engraved seals symbolizing courage, vitality, and eloquence.
Note: Cultural and birthstone traditions are presented strictly as historical folklore, never as scientifically verified medical or metaphysical effects.
Chalcedony / Microcrystalline Quartz
Related Entries
Vivid apple green to mint green; unlike emerald or chrome chalcedony, its color comes from trace nickel rather...
Chemical formula
SiO₂ + Ni²⁺ (Nickel-bearing phyllosilicate/pimelite inclusions)
Deep forest-green semitranslucent to opaque chalcedony speckled with vivid crimson spots of iron oxide (hematite).
Chemical formula
SiO₂ + Chlorite/Amphibole (green) and Hematite (red spots)