metamorphic
Pink Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2 with Iron Oxide impurities)
Hardness: 7 (Mohs scale); Color: White to light pink with darker reddish-pink iron staining; Luster: Vitreous to waxy; Texture: Fine-grained, sugary (saccharoidal) appearance; Cleavage: None.
- Hardness
- 7 (Mohs scale)
- Color
- White to light pink with darker reddish-pink iron staining
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: White to light pink with darker reddish-pink iron staining; Luster: Vitreous to waxy; Texture: Fine-grained, sugary (saccharoidal) appearance; Cleavage: None.
Formation & geological history
Formed through the regional or contact metamorphism of quartz-rich sandstone. High heat and pressure caused the original sand grains to recrystallize and fuse together. The pink color is typical of hematite or other iron mineral inclusions.
Uses & applications
Commonly used as decorative landscaping stone, in road construction as ballast, and occasionally for lapidary work like tumbling.
Geological facts
Quartzite is so tough that it often survives intense glacial transport and water erosion, which is why it is frequently found as rounded river or beach pebbles like this one. It is harder than steel.
Field identification & locations
Identified in the field by its hardness (it will scratch glass) and lack of reaction to acid. Look for a crystalline sparkle when held to light. Common in ancient mountain belts and glacial till.
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