mineral

Chalcedony (Agate/Carnelian variant)

Silicon Dioxide (SiO2)

Hardness: 6.5-7 Mohs; Color: Pale yellow to translucent white; Luster: Waxy to vitreous; Crystal structure: Trigonal (cryptocrystalline); Cleavage: None; Specific Gravity: 2.58–2.64.

Hardness: 6
Color: Pale yellow to translucent white
Luster: Waxy to vitreous

Identified June 26, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6.5-7 Mohs; Color: Pale yellow to translucent white; Luster: Waxy to vitreous; Crystal structure: Trigonal (cryptocrystalline); Cleavage: None; Specific Gravity: 2.58–2.64.

Formation & geological history

Formed through the deposition of silica-rich groundwater in cavities of igneous and sedimentary rocks. This specific specimen appears water-worn, suggesting secondary transport in a river or coastal environment.

Uses & applications

Used primarily in jewelry (cabochons and beads), ornamental carvings, and as a semi-precious gemstone for collectors.

Geological facts

This specimen shows a characteristic waxy surface and conchoidal fracture. Yellowish chalcedony is sometimes referred to as 'yellow agate' or 'honey agate' depending on the intensity of the color tinting from iron oxides.

Field identification & locations

Identify in the field by its waxy texture, lack of visible crystals (cryptocrystalline), and its ability to scratch glass. Commonly found in gravel beds, volcanic deposits, and along beaches in regions like the Pacific Northwest or lake shores.

Other mineral specimens

See all

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