metamorphic
Quartzite with Garnet inclusion
Metamorphic Quartz-rich Rock
Hardness of 7 on Mohs scale (for the quartz matrix) and 6.5-7.5 for the garnet crystal; color ranges from yellowish-brown (weathered exterior) with a dark reddish-brown garnet; vitreous to greasy luster; massive crystal structure with a prominent embedded euhedral garnet crystal; no cleavage;…
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Physical properties
Hardness of 7 on Mohs scale (for the quartz matrix) and 6.5-7.5 for the garnet crystal; color ranges from yellowish-brown (weathered exterior) with a dark reddish-brown garnet; vitreous to greasy luster; massive crystal structure with a prominent embedded euhedral garnet crystal; no cleavage; specific gravity around 2.65.
Formation & geological history
Formed through the regional metamorphism of a quartz-rich sandstone or chert, often subjected to intense heat and pressure over millions of years. The garnet crystal formed within the matrix under moderate to high-grade metamorphic conditions.
Uses & applications
Used primarily as decorative landscape stones, aggregates in construction, and as collector specimens due to the striking embedded garnet.
Geological facts
Quartzite is extremely durable and resistant to weathering, which is why it often survives long journeys in rivers as rounded pebbles while retaining hard mineral inclusions like garnets.
Field identification & locations
Can be identified in the field by its high hardness (scratches glass), sugary texture on fresh breaks, and the presence of distinct embedded mineral crystals like the reddish garnet visible here. Found worldwide in ancient metamorphic belts.
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