mineral

Polished pink and brown agate

Microcrystalline quartz (SiO₂), likely agate or chalcedony with iron-oxide staining

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; mottled cream, pink, and reddish-brown, with a waxy to vitreous polish. Trigonal quartz structure; no visible cleavage and uneven fracture. The image does not show enough detail to confirm a specific agate variety.

Identified October 16, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited quartz in cavities or fractures, with iron compounds producing the warm colors; agates form in many rock types and span a wide range of geological ages.

Uses & applications

Used for lapidary carvings, beads, jewelry, and decorative objects; also collected as a polished specimen.

Geological facts

Agate is a banded or patterned variety of chalcedony, though some pieces have diffuse rather than sharply defined patterns.

Field identification & locations

Look for translucency at thin edges, waxy luster, and curved or cloudy internal patterns; common sources include Brazil, Uruguay, India, and the United States. This polished piece cannot be reliably assigned to a locality from appearance alone.