Where is Limonite with Quartz found?
FeO(OH)·nH2O (Limonite) with SiO2 (Quartz)
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Open the appLimonite with 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 Limonite with Quartz
Mesabi Range, Minnesota, USA
Known for extensive iron ore deposits, where limonite is a common weathering product associated with taconite and other iron formations, often found with quartz.
Krivoy Rog, Ukraine
Major iron ore region with significant occurrences of iron-rich rocks, including limonite and quartz associations.
Pilbara Region, Western Australia
World-class iron ore province where limonite is abundant in weathered zones and often found with quartz.
Brazil (Minas Gerais)
Rich in iron ore deposits, including lateritic soils and weathered iron formations where limonite and quartz are common.
Various localities worldwide
Due to its secondary nature, limonite with quartz can be found in almost any region with iron-bearing rocks and sufficient weathering, including many sedimentary basins and areas with hydrothermal alteration.
Collecting tips
- Look for Iron Staining. Search for rocks with distinct yellow, orange, brown, or reddish-brown staining, especially in areas known for iron mineralization or weathered bedrock. The color is a key indicator of limonite.
- Check for Quartz Characteristics. Identify the presence of quartz by its hardness (scratches glass), vitreous luster (if not heavily coated), and conchoidal fracture. Limonite will be softer and have an earthy luster.
- Examine Weathered Zones. Focus on gossans (iron-rich caps over ore deposits), stream beds, and areas where bedrock is exposed to significant weathering. Limonite is a common product of these processes.
- Test Streak. Limonite will produce a yellowish-brown to brownish-yellow streak, which is a definitive characteristic. Quartz will have a white streak or no streak on a streak plate.
- Consider Geological Context. Understand the local geology. If the area has iron-rich sedimentary rocks, igneous rocks with iron-bearing silicates, or sulfide deposits, the likelihood of finding limonite with quartz increases.
Quick Check
- Color:
- Yellow, orange, brown, reddish-brown (from limonite); colorless to white (from quartz)
- Luster:
- Earthy to dull (limonite); vitreous to greasy (quartz)
- Streak:
- Yellowish-brown to brownish-yellow (limonite); white or no streak (quartz)
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