metamorphic
Tumbled quartz-bearing rock, possibly garnet-bearing quartzite
Quartz-dominant silicate rock; visible minerals may include quartz, iron oxides, and dark mica or amphibole
AI-generated identification · may be incorrectHardness approximately 6.5–7 Mohs; translucent white to pink with reddish-brown and dark inclusions, vitreous to sugary luster, and granular interlocking crystals. No obvious cleavage is visible; exact identification requires a fresh surface and tests.
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Physical properties
Hardness approximately 6.5–7 Mohs; translucent white to pink with reddish-brown and dark inclusions, vitreous to sugary luster, and granular interlocking crystals. No obvious cleavage is visible; exact identification requires a fresh surface and tests.
Formation & geological history
Likely formed by metamorphism of quartz-rich sandstone, with later iron staining and accessory minerals; its precise geological age and locality cannot be determined from the photograph.
Uses & applications
Used primarily as a decorative tumbled specimen or lapidary material; quartz-rich varieties may be used as aggregate or ornamental stone. Collector value is generally modest unless the inclusions or locality are distinctive.
Geological facts
The pink-red coloration commonly comes from iron oxides or feldspar, while dark patches may be mica, amphibole, or tourmaline. A steel file should not scratch quartz, and a streak test can help distinguish metallic-looking inclusions.
Field identification & locations
Commonly found in metamorphic terrains and gravel deposits worldwide; likely candidates include quartzite, granite-derived cobbles, and iron-stained quartz. Estimated value: $1–$10 for a small common tumbled piece; $10–$30 if the inclusions are attractive or locality-specific.
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