Red Quartzite / Jasper-rich Pebble

Physical Properties

Hardness: 7 (Mohs scale); Color: Reddish-brown to maroon; Luster: Vitreous to dull; Crystal Structure: Hexagonal (microcrystalline); Cleavage: None; Specific Gravity: 2.6-2.7

Formation & Geological History

Formed through the metamorphism of quartz-rich sandstone. High heat and pressure Recrystallize the quartz grains into a dense, hard rock. The red color is typically due to the presence of iron oxides like hematite.

Uses & Applications

Used as decorative stone in landscaping, aquarium gravel, and occasionally tumbled for inexpensive jewelry or pocket stones.

Geological Facts

Quartzite is so tough that it often survives millions of years of erosion, which is why it is commonly found as rounded river or beach pebbles like the one in this image.

Field Identification & Locations

Identify by its extreme hardness (it will scratch glass) and lack of visible grains compared to sandstone. Commonly found in riverbeds, glacial tills, and ancient mountain belts.

Identified on: 4/15/2026

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