metamorphic
Quartzite with Mafic Inclusion
Metamorphic Quartzite / Mafic Host Rock
Hardness of 7 on the Mohs scale for the quartz-rich white portion, lower for the greenish-grey mafic portion. Colors range from milky white to dark green/grey. Luster is vitreous to dull. Massive or crystalline granular structure.
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Physical properties
Hardness of 7 on the Mohs scale for the quartz-rich white portion, lower for the greenish-grey mafic portion. Colors range from milky white to dark green/grey. Luster is vitreous to dull. Massive or crystalline granular structure.
Formation & geological history
Formed through the regional metamorphism of a quartz-rich sandstone or chert, often associated with tectonic compression and heat over millions of years.
Uses & applications
Used in construction, landscaping, road aggregate, and as decorative stone.
Geological facts
Quartzite is extremely durable and resistant to weathering, which is why it often survives as resistant pebbles and boulders in glacial or river deposits.
Field identification & locations
Can be identified in the field by its hardness (scratches glass easily on the white quartz portion) and lack of effervescence with acid. Commonly found in riverbeds, glacial tills, and mountainous regions worldwide.
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