mineral

Agate (Laguna or Lace variety pattern)

Silicon Dioxide (SiO2)

Hardness: 6.5-7 (Mohs); Color: Multi-colored banding (white, red, brown, translucent); Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.64

Hardness: 6
Color: Multi-colored banding (white, red, brown, translucent)
Luster: Waxy to vitreous

Identified June 20, 2026More mineral →

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Physical properties

Formation & geological history

Formed in cavities (vesicles) of volcanic or metamorphic rocks through the deposition of silica from groundwater. This specific piece appears to be a seam agate or a fragment of a larger geode, often dating from various eras depending on the host rock.

Uses & applications

Primary uses include lapidary work (cabochons), jewelry, ornamental carvings, and collector specimens. Historically used for hardstone carvings.

Geological facts

Agate is a cryptocrystalline variety of silica, characterized by its fineness of grain and brightness of color. It is named after the Achates River in Sicily where it was first found in ancient times.

Field identification & locations

Identify by concentric or parallel banding and translucency when held to light. Found globally in volcanic regions like the American Southwest, Mexico, and Brazil. Collectors look for sharp banding and unique colors.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral