gemstone
Tumbled carnelian
Carnelian, a red-orange variety of chalcedony (microcrystalline quartz, SiO₂)
AI-generated identification · may be incorrectMohs hardness 6.5–7; orange-red, waxy to vitreous luster, cryptocrystalline structure, and no visible cleavage. The glossy surface suggests it has been polished or tumbled.
Identified More gemstone →
Explore Tumbled carnelian in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Mohs hardness 6.5–7; orange-red, waxy to vitreous luster, cryptocrystalline structure, and no visible cleavage. The glossy surface suggests it has been polished or tumbled.
Formation & geological history
Forms as silica-rich chalcedony, often filling cavities in volcanic rocks; iron oxides create its warm color. Deposits occur in many ages and settings, including ancient volcanic terrains.
Uses & applications
Used for beads, cabochons, carvings, and decorative objects; historically made into seals and jewelry.
Geological facts
Carnelian has been valued since antiquity, including in Egyptian and Roman jewelry and engraved seals.
Field identification & locations
Common sources include India, Brazil, Uruguay, and Madagascar. Identify it by its translucent orange-to-red color, smooth polish, and hardness; the photo alone cannot confirm the material.
More like this
Other gemstone specimens
Ammolite
Ammolite (Biogenic Aragonite with trace elements; fossils of Placenticeras meeki and Placenticeras intercalare)
mineral
Gemstone Ring
N/A - Set piece of jewelry, likely Amethyst or Garnet with Diamond or CZ
gemstone
Amber
Succinite (Organic Gemstone)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Diamond and Gold Jewelry
Carbon (Diamond) / Au (Gold)
gemstone
Pearl necklace
Pearl, primarily aragonite (CaCO₃) and conchiolin
gemstone