Where is Graphitic Quartz found?
SiO2 with C
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Open the appGraphitic 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 Graphitic Quartz
Appalachian Mountains, USA
Known for various metamorphic rocks, including graphitic schists and quartzites, particularly in states like Pennsylvania, New York, and Alabama.
Eastern Canada (e.g., Quebec, Ontario)
Regions with extensive Precambrian metamorphic belts often host graphite deposits associated with quartz-rich rocks.
Brazil (e.g., Minas Gerais)
Significant graphite deposits are found in metamorphic rocks, often associated with quartz.
India (e.g., Odisha, Kerala)
Graphite occurrences in metamorphic terrains are common, frequently intergrown with quartz.
Sri Lanka
Famous for high-quality vein graphite, which can occur within quartz veins in metamorphic rocks.
Collecting tips
- Look for Metamorphic Terrains. Focus on areas mapped as metamorphic belts, especially those derived from sedimentary protoliths rich in organic matter.
- Identify Dark, Flaky Minerals. Graphite's distinctive dark color, metallic luster (when fresh), and flaky habit are key indicators. It will often leave a mark on paper.
- Check for Greasy Feel. Graphite has a characteristic greasy feel due to its perfect basal cleavage, which can be felt even when disseminated in quartz.
- Observe Luster Contrast. The contrast between the vitreous luster of quartz and the metallic/dull luster of graphite is a good visual cue.
- Examine Rock Associations. Look for quartz with graphite in association with other metamorphic minerals like micas (muscovite, biotite), feldspars, and sometimes sulfides.
Quick Check
- Color:
- Dark gray to black (graphite) with white to gray (quartz)
- Luster:
- Vitreous (quartz) and metallic to dull/earthy (graphite)
- Streak:
- White (quartz) and black to dark gray (graphite)
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