Where is Smoky Quartz and Carnelian found?
SiO2 (Smoky Quartz), SiO2 (Carnelian)
Got a photo? Identify rocks instantly with the Rockby app
Open the appSmoky Quartz and Carnelian 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 Smoky Quartz and Carnelian
Smoky Quartz: Brazil
Minas Gerais is a major source of large, high-quality smoky quartz crystals.
Smoky Quartz: Switzerland
The Alps, particularly the Grimsel Pass area, are famous for fine smoky quartz specimens.
Smoky Quartz: United States
Colorado (Pikes Peak region), North Carolina, and Arkansas are known localities.
Carnelian: India
Historically, India has been a primary source of high-quality carnelian, particularly from the Deccan Traps region.
Carnelian: Brazil
Significant deposits are found, often associated with agate and other chalcedony varieties.
Carnelian: Uruguay
Known for its fine chalcedony, including carnelian, often found in geodes.
Carnelian: Madagascar
Produces good quality carnelian, often found in alluvial deposits.
Collecting tips
- Smoky Quartz in Pegmatites. Look for smoky quartz in granitic pegmatites, often associated with feldspar, mica, and other quartz varieties. Crystals can be found in vugs or pockets within the pegmatite body.
- Carnelian in Volcanic Areas. In regions with ancient volcanic activity, search for carnelian in amygdules (gas bubbles filled with minerals) within basalt or other volcanic rocks. Also check stream beds and gravel deposits downstream from such areas.
- Hardness Test. Both minerals are quartz (Mohs hardness 7), so they will scratch glass and steel. This helps distinguish them from softer look-alikes.
- Transparency and Color. Hold specimens up to light to observe their characteristic transparency and color. Smoky quartz will show its smoky hue, while carnelian will exhibit its reddish-orange translucency.
Quick Check
- Color:
- Smoky Quartz: Gray-brown to black; Carnelian: Reddish-orange to brownish-red
- Luster:
- Smoky Quartz: Vitreous; Carnelian: Waxy to dull
- Streak:
- White (for both, as they are varieties of quartz)
Explore Smoky Quartz and Carnelian
Identify rocks anywhere
Free on iOS, Android, and Web. Photo identification, full database, and your personal collection.