Where is Quartzite with Pyrite found?
Quartzite (metamorphic rock) with Pyrite (FeS2)
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Open the appQuartzite with Pyrite 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 Quartzite with Pyrite
Appalachian Mountains, USA
Extensive quartzite formations, some of which contain pyrite, are found throughout the Appalachian orogen, particularly in Pennsylvania, Maryland, and Virginia.
Canadian Shield, Canada
Ancient Proterozoic quartzites, sometimes with associated sulfide mineralization including pyrite, are common in various parts of the Canadian Shield.
Brazil
Significant quartzite deposits, some with pyrite, are found in various states, often associated with iron ore deposits.
Scandinavia
Regions like Norway and Sweden host ancient metamorphic terrains with quartzite units that can contain pyrite.
Australia
Parts of Western Australia and South Australia contain Proterozoic quartzites, some of which are pyritic.
Collecting tips
- Look for Metamorphic Terrains. Focus your search in areas known for regional metamorphism, such as ancient mountain belts or cratonic margins where sandstones have been subjected to high pressures and temperatures.
- Identify Quartzite Characteristics. First, identify the quartzite by its hardness (scratches steel), glassy luster, and interlocking granular texture. It will not fizz with dilute HCl (unless it has carbonate impurities).
- Spot the Pyrite. Once quartzite is identified, look for small, brassy yellow, metallic specks or cubes embedded within the rock. These are characteristic of pyrite.
- Check for Weathering Effects. Pyrite can oxidize to iron oxides (limonite, goethite), leaving rusty stains or vugs (small cavities) in the rock. This can be an indicator of past or present pyrite presence.
- Safety Precautions. When collecting, be aware that pyrite can oxidize to sulfuric acid and iron oxides, which can stain hands and clothing. Always wear appropriate personal protective equipment (PPE) such as gloves and eye protection, especially if breaking samples. Avoid inhaling dust, as quartzite contains crystalline silica, a known respiratory hazard.
Quick Check
- Color:
- White, gray, pink, or reddish quartzite with brassy yellow metallic specks.
- Luster:
- Vitreous to greasy for quartzite, metallic for pyrite.
- Streak:
- Quartzite: White. Pyrite: Greenish-black to brownish-black.
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