metamorphic

Weathered iron-rich metamorphic rock, likely schist or phyllite

Quartz–mica schist/phyllite; composition likely quartz, mica, feldspar, and iron oxides

AI-generated identification · may be incorrect

Brown to rusty gray, fine- to medium-grained, weakly foliated with sparkly mica and pale quartz flecks; likely Mohs 2–7 depending on mineral, with earthy to silky luster and cleavage along foliation. The image does not resolve the texture enough for a definitive species identification.

Identified September 15, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when shale or another clay-rich sediment was buried, heated, and compressed during regional metamorphism; age depends on its source terrane and cannot be determined visually. Rusty coloration reflects weathering of iron-bearing minerals.

Uses & applications

Used locally as decorative stone, landscaping material, wall rock, or aggregate; attractive micaceous pieces may be collected, but it is generally unsuitable for high-end jewelry or polished countertops.

Geological facts

Foliation and mica sparkle distinguish it from ordinary soil or massive sandstone, while brown staining commonly indicates limonite/goethite. A fresh broken surface and hand lens would improve identification.

Field identification & locations

Common in metamorphic mountain belts worldwide, including the Appalachians, Rockies, Alps, and Scandinavia; test for layered splitting, mica flakes, and hardness variation. Estimated value: $5–$30 as a common field specimen, occasionally $50–$100 if unusually attractive.