Where is Rutilated Quartz found?
SiO2 with TiO2 inclusions
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Open the appRutilated 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 Rutilated Quartz
Brazil
Minas Gerais is a major source, particularly for high-quality golden rutilated quartz.
Australia
Known for producing rutilated quartz, often with fine, dense rutile needles.
Madagascar
Produces rutilated quartz with various colors and patterns of rutile.
United States
Localities in Arkansas and North Carolina have yielded rutilated quartz.
Kazakhstan
Known for some occurrences of rutilated quartz.
Collecting tips
- Look for Hydrothermal Veins. Rutilated quartz often forms in quartz veins associated with hydrothermal activity. Look for areas with exposed vein systems in granitic or metamorphic terrains.
- Examine Pegmatites. Pegmatite dikes are another common environment for the formation of large, well-formed quartz crystals, which can host rutile inclusions.
- Check Metamorphic Rocks. Some metamorphic rocks, especially those with a history of fluid interaction, can contain rutilated quartz.
- Identify Rutile Needles. The key identifying feature is the presence of distinct, often metallic-looking, needle-like inclusions within transparent to translucent quartz. Use a loupe or magnifying glass.
Quick Check
- Color:
- Clear to smoky quartz with golden, reddish-brown, or black needle-like inclusions.
- Luster:
- Vitreous (glassy) for quartz, adamantine to sub-metallic for rutile inclusions.
- Streak:
- White (for quartz); rutile inclusions are too small to produce a streak on a streak plate when encased, but pure rutile has a yellowish-brown streak.
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