Where is Chlorite-Included Quartz with Iron Staining found?
SiO2 (Quartz) with (Mg,Fe)3(Si,Al)4O10(OH)2 (Chlorite) and Fe-oxides
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Open the appChlorite-Included Quartz with Iron Staining 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 Chlorite-Included Quartz with Iron Staining
Brazil
Known for various types of included quartz, including chlorite phantoms and iron-stained varieties, particularly from Minas Gerais.
Alpine regions (e.g., Switzerland, Austria)
Classic localities for well-formed quartz crystals, often with chlorite inclusions from metamorphic environments.
United States (e.g., Arkansas, North Carolina)
Arkansas is famous for its quartz, and chlorite inclusions and iron staining are common. North Carolina also produces similar specimens from metamorphic terrains.
Madagascar
A source of various quartz types, including those with green chlorite inclusions.
Collecting tips
- Look for Hydrothermal Veins. These are prime locations for quartz crystallization and the introduction of other minerals like chlorite. Look for areas with evidence of past fluid flow.
- Examine Metamorphic Terrains. Low-grade metamorphic rocks, especially those derived from mafic protoliths, can host chlorite-rich quartz.
- Check for Iron Staining. The reddish-brown or orange staining is a key indicator. It often occurs in weathered outcrops or near iron-rich mineral deposits.
- Use a Hand Lens. Chlorite inclusions can be very fine-grained. A hand lens (10x magnification) will help distinguish the green flakes or specks within the quartz.
- Distinguish from Other Green Inclusions. Be careful not to confuse chlorite with other green minerals like epidote, actinolite, or even fine-grained mica. Chlorite typically has a softer, more earthy or platy appearance compared to the often prismatic epidote or fibrous actinolite.
Quick Check
- Color:
- Colorless to smoky quartz with green inclusions and reddish-brown staining.
- Luster:
- Vitreous (quartz), dull/pearly (chlorite), earthy (iron oxides).
- Streak:
- White (quartz), pale green (chlorite), reddish-brown to yellowish-brown (iron oxides).
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