metamorphic

Likely garnet-bearing schist or gneiss

Mica schist/gneiss containing quartz, feldspar, mica, and possible almandine garnet

AI-generated identification · may be incorrect

Hardness approximately 5–7; reddish-brown, gray, and silvery colors with a sparkly micaceous luster. The irregular foliation and granular texture suggest metamorphic fabric; individual minerals and cleavage are not clear enough for certainty.

Identified September 6, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when shale or other sedimentary protolith was subjected to elevated temperature and pressure during regional metamorphism, commonly during mountain building. Such rocks may range from hundreds of millions to over a billion years old, depending on locality.

Uses & applications

Used locally as decorative stone, landscaping material, or aggregate; attractive garnet-bearing pieces are collected as specimens. It is generally unsuitable for high-quality dimension stone if strongly foliated.

Geological facts

The reddish grains may be almandine garnet, but the photograph cannot confirm them; they could also be iron-stained feldspar or weathered mica. A fresh surface, hand lens, and streak or hardness tests would improve identification.

Field identification & locations

Look for planar mica alignment, sparkly cleavage surfaces, quartz-rich grains, and hard reddish garnets that resist scratching by a steel knife. Common in metamorphic mountain belts worldwide, including New England, the Appalachians, Scandinavia, and the western United States.