metamorphic

Iron-stained metamorphic rock, likely schist or quartzite

Quartz–mica–iron oxide rock; probable muscovite/biotite schist or ferruginous quartzite

AI-generated identification · may be incorrect

Brown to orange-brown, granular and locally foliated, with earthy to faintly sparkly luster from mica and iron oxides. Likely hardness 5.5–7 Mohs, depending on quartz content; quartz-rich areas are hard, while mica-rich layers may split.

Identified September 8, 2026More metamorphic →

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At a glance

Common name: Iron-stained metamorphic rock, likely schist or quartzite
Scientific name: Quartz–mica–iron oxide rock; probable muscovite/biotite schist or ferruginous quartzite
Category: metamorphic
Identified: September 8, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a common hand specimen; $20–$75 if unusually attractive, mineral-rich, or locality-labeled.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Probably formed when quartz-rich sediment or volcanic material was buried, heated, and metamorphosed, then oxidized near the surface by groundwater. Exact geological age and identification require a fresh surface, streak, hardness, and mineralogical testing.

Uses & applications

Typically used as a field specimen, landscaping stone, or aggregate if sufficiently durable; attractive pieces may be collected but are rarely used as gemstones.

Geological facts

The orange-brown coloration is characteristic of hematite and/or limonite coatings replacing or staining iron-bearing minerals. A magnet test may detect included magnetite, but iron staining alone is not magnetic.

Field identification & locations

Common in metamorphic terrains worldwide, especially areas with schist, quartzite, and iron-rich hydrothermal alteration. Test hardness against glass, inspect for planar mica foliation, and use a streak plate or acid test to distinguish it from iron-rich sedimentary rock.