Where is Carnelian and Citrine Quartz found?
SiO2 (Carnelian is a variety of Chalcedony, Citrine is a variety of Quartz)
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Open the appCarnelian and Citrine Quartz occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Carnelian and Citrine Quartz
Brazil
A major source of both natural and heat-treated citrine, particularly from the state of Rio Grande do Sul. Also a source of carnelian.
Uruguay
Known for high-quality amethyst geodes, which are often heat-treated to produce citrine. Also produces carnelian.
India
Historically a significant source of carnelian, particularly from the Deccan Traps region. Also produces some citrine.
Madagascar
Produces both natural citrine and carnelian, often found in pegmatites and alluvial deposits.
Russia (Ural Mountains)
Historically known for fine quality amethyst and some natural citrine.
United States (Oregon, Washington, California)
Various localities produce chalcedony, including carnelian, and some quartz varieties.
Collecting tips
- Look in Volcanic and Sedimentary Environments for Carnelian. Carnelian is often found in areas with past volcanic activity, where silica-rich fluids have filled vesicles in basalt or other igneous rocks. Also check riverbeds and gravel deposits where it may have eroded from its source.
- Search for Geodes and Pegmatites for Citrine. Citrine frequently forms in geodes within volcanic rocks or in pegmatite dikes. Look for these geological features in areas known for quartz mineralization.
- Examine Color and Transparency. Carnelian should have a distinct reddish-orange to reddish-brown color and be translucent to opaque. Citrine will be yellow to orange-brown and transparent to translucent. Be aware that much 'citrine' on the market is heat-treated amethyst.
- Check for Conchoidal Fracture. Both Carnelian and Citrine, being varieties of quartz, will exhibit a characteristic conchoidal (shell-like) fracture when broken, rather than distinct cleavage planes.
- Test Hardness. With a Mohs hardness of 7, both minerals will scratch glass and steel. This helps differentiate them from softer look-alikes.
Quick Check
- Color:
- Carnelian: Reddish-orange to reddish-brown. Citrine: Yellow to orange-brown.
- Luster:
- Vitreous to waxy (Carnelian); Vitreous (Citrine).
- Streak:
- White (for both).
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