metamorphic
Banded Quartzite with Epidote and Iron Oxides
Metasedimentary Quartzite (SiO2) with inclusions
Hardness: 6.5-7 (can scratch glass). Color: Banded green (epidote), red (iron oxides), and white (quartz). Luster: Vitreous to dull. Structure: Granular/crystalline metamorphic fabric. Specific Gravity: ~2.6-2.7.
- Hardness
- 6
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (can scratch glass). Color: Banded green (epidote), red (iron oxides), and white (quartz). Luster: Vitreous to dull. Structure: Granular/crystalline metamorphic fabric. Specific Gravity: ~2.6-2.7.
Formation & geological history
Formed from the regional metamorphism of quartz-rich sandstone. The distinct color bands result from the presence of iron minerals (hematite/goethite) and epidote/chlorite that were present in the original sedimentary layers or introduced via hydrothermal fluids.
Uses & applications
Primarily used as decorative stone, aquarium gravel, or lapidary material for tumbling. In large scales, it is used for crushed stone in construction or railroad ballast.
Geological facts
Quartzite is so durable that it often survives intense weathering that wears away surrounding rocks. The red coloring in this specimen suggests an oxygen-rich environment during its sedimentary phase or subsequent oxidation.
Field identification & locations
Identify by its hardness (will not react to acid unlike marble) and the way it fractures across sand grains. Commonly found in old mountain belts like the Appalachians, the Great Lakes region, or the Alps.
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