Where is Veined Chert found?
Chert with Quartz Veins
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Open the appVeined Chert 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 Veined Chert
Ohio, USA
Flint Ridge State Memorial is famous for its high-quality, colorful chert, often exhibiting quartz veins, used extensively by Native Americans.
Missouri, USA
Ozark region, abundant chert formations, including veined varieties, often found in stream beds and road cuts.
England
Flint nodules in chalk cliffs (e.g., Dover) can sometimes show quartz infilling of fractures.
Australia
Various chert deposits, particularly in ancient sedimentary basins, may contain quartz veins.
Worldwide
Chert is a common sedimentary rock, and veined chert can be found in any region with significant chert deposits that have undergone fracturing and subsequent silica precipitation.
Collecting tips
- Look in Sedimentary Environments. Search in areas with exposed sedimentary rocks, especially limestone, dolomite, and shale formations, where chert nodules or beds are common. Riverbeds and gravel pits are also good places to find weathered chert fragments.
- Identify Fractures. Look for rocks with distinct linear or irregular patterns of a different color or texture running through a chert matrix. The veins will typically be lighter (white, clear) than the surrounding chert.
- Test Hardness. Both chert and quartz are hard (Mohs 7). They will scratch glass and steel. This helps distinguish them from softer rocks.
- Observe Fracture Pattern. Both chert and quartz exhibit conchoidal fracture, producing sharp, curved surfaces. The veins might show a more crystalline break if individual quartz crystals are large enough.
Quick Check
- Color:
- Variable chert matrix (grey, black, brown, etc.) with white/clear quartz veins.
- Luster:
- Chert: dull to waxy; Quartz veins: vitreous.
- Streak:
- White (for both chert and quartz).
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