metamorphic
Iron-rich metamorphic rock, likely specular hematite-bearing schist
Hematite–quartz–mica schist (tentative)
AI-generated identification · may be incorrectGray-brown, strongly foliated and flaky, with metallic to submetallic reddish-black reflective surfaces. Hematite has Mohs hardness 5–6.5, quartz about 7; cleavage is mainly from mica, and specific gravity is commonly 2.8–5.3 depending on iron content.
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Physical properties
Gray-brown, strongly foliated and flaky, with metallic to submetallic reddish-black reflective surfaces. Hematite has Mohs hardness 5–6.5, quartz about 7; cleavage is mainly from mica, and specific gravity is commonly 2.8–5.3 depending on iron content.
Formation & geological history
Formed when iron-rich sediment or volcanic material was buried, heated, and deformed during regional metamorphism; commonly Precambrian to Paleozoic in age. The exact mineralogy cannot be confirmed from an image alone.
Uses & applications
Used mainly as a teaching or collector specimen; hematite-rich material may be used as iron ore or pigment, while schist is occasionally used decoratively but is generally unsuitable for structural construction.
Geological facts
A reddish-brown streak on unglazed porcelain supports hematite; magnetism, if present, may indicate associated magnetite. The visible foliation and glittering platy grains distinguish it from massive iron ore.
Field identification & locations
Common in metamorphic belts worldwide, including the Lake Superior region, Brazil, India, and Australia. Inspect streak, magnetism, and hardness for confirmation; laboratory testing would be needed for a precise identification.
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