1. Silica Balls
   Silica balls are an industrial term referring to high-purity quartz stones that have been artificially crushed, screened, and polished into spherical or near-spherical shapes.

Composition: High-purity silicon dioxide (SiO₂ content typically >99%).

Source: Produced from natural quartz or quartz sandstone through mechanical processing.

Characteristics:

High Hardness: Mohs hardness of 7, highly wear-resistant.

• Excellent Chemical Stability: Resistant to acids and alkalis, chemically inert.

• Uniform Particle Size: Precisely graded through industrial sieving (e.g., 1–2 mm, 2–4 mm, 10–20 mm).

• Appearance: Color varies with purity and impurities, commonly white, translucent, or pale yellow.

2. Pebbles
   Pebbles are natural stones formed from rocks (mainly quartzite) that have been weathered, eroded, and polished by rivers, lakes, or oceans over millions of years.

Composition: Primarily silicon dioxide (SiO₂), but with variable purity and containing various mineral impurities.

Source: Naturally formed, collected from riverbeds, beaches, or sand mines.

Characteristics:

• Smooth and Rounded Shape: Naturally polished by water, with no sharp edges.

• Variable Size: Sizes range widely, from pea-sized to fist-sized; can be sorted and supplied according to specifications.

• Rich Color Variety: Colors vary depending on mineral content, including black, white, yellow, red, and mixed colors.

• High Hardness: Wear-resistant, though hardness depends on the parent rock composition.

Key Differences Summary